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The intricate geomorphology of the coastline in the Chilean Channels and Fjords region, together with the freshwater inputs from the ice fields provide the area with very unique ecological characteristics and a variety of habitats that favour great marine biodiversity. However, although Chilean Patagonia has been the focus of several expeditions and ecological surveys, the greatest emphasis has been either on the populated coasts of the Beagle Channel and the Straits of Magellan to the south or the area to the north of Golfo de Penas, leaving vast areas that remain largely unexplored. This leads to a latitudinal gap in the faunistic information and hinders zoogeographic studies to assess biogeographical connections along the eastern coasts of the Pacific. Peracarida is a taxonomic group that provides an excellent model for such studies because of their high abundance and biodiversity, benthic habits, small size and limited dispersal capacity. A dataset providing the first and only records of the benthic Peracarida between the latitudes 48–51.5°S of the Pacific coast of Chile is presented here, hence closing a geospatial gap for the study of the biogeographical connections of the Peracarida along the Eastern Pacific coast. The dataset comprises a total of 141 georeferenced records of 60 sublittoral species of Tanaidacea, Isopoda and Amphipoda. This and other studies reveal that the coastal fauna of the region follow a latitudinal distribution pattern at a larger scale and nested assemblages inside the channels and fjords that can be regarded as a consequence of the more restrictive conditions in the inner parts. In the present scenario of global warming that is expected to affect particularly polar and subpolar regions, the present dataset serves as a reference for the distribution patterns of benthic organisms with low dispersal capacity.

Key to the species of the Abyssorchomene abyssorum complex 1. Pereonites 1–7 and pleonites 1–2 with weak but distinct dorsoposterior rounded hump; epistome level with upper lip; uropod 3 inner ramus extends well past distal end of article 1 of uropod 3 outer ramus; maxilla 1 palp distal end weakly convex, with distal spines contiguous............................... 2 – Pereonites 1–7 and pleonites 1–2 lacking dorsoposterior rounded hump; epistome weakly but distinctly protruding in front of upper lip (or level with upper lip); uropod 3 inner ramus just reaches (or very slightly exceeds) distal end of article 1 of uropod 3 outer ramus; maxilla 1 palp distal end strongly convex, with distal spines not contiguous.......................................... A. scotianensis (Andres, 1983) 2. Coxa 1 slightly widened distally, ~ 1.2× proximal width; gnathopod 2 propodus of female narrow, (similar in form to male), length ~ 2.5× width, palm lacking concavity; uropod 3 inner ramus extends to ~ 70% of the length of article 2 of uropod 3 outer ramus.............. A. abyssorum (Stebbing, 1888) – Coxa 1 strongly widened distally, ~ 1.3–1.7× proximal width; gnathopod 2 propodus of female broad, (different in form to narrow male propod), length A. shannonae sp. nov. – Coxa 5 posteroventral lobe narrowly rounded, posterior margin with distinct straight section; lateral head lobe, dorsal margin strongly convex, ventral margin nearly straight with slight concavity at the midpoint; gnathopod 2 propodus of female with anterodistal margin not expanded and protruding, dactylus large, inserted at the top of the distal margin; gnathopod 2 propod of male not expanded, narrow, dorsal margin smoothly convex; pereopod 7 basis posteroventral corner shallowly and weakly beveled; uropod 3 inner ramus extends to ~ 63% of article 2 of uropod 3 outer ramus................................................................................................................................................... A. patriciae sp. nov., Published as part of Hendrycks, Ed A. & Broyer, Claude De, 2022, New deep-sea Atlantic and Antarctic species of Abyssorchomene De Broyer, 1984 (Amphipoda, Lysianassoidea, Uristidae) with a redescription of A. abyssorum (Stebbing, 1888), pp. 1-76 in European Journal of Taxonomy 825 on page 68, DOI: 10.5852/ejt.2022.825.1829, http://zenodo.org/record/6686625, {"references":["Andres H. G. 1983. Die Gammaridea (Crustacea: Amphipoda) der Deutschen Antarktis-Expeditionen 1975 / 76 und 1977 / 78. 3. Lysianassidae. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut 80: 183 - 220.","Stebbing T. R. R. 1888. Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology 29: 1737, plates 1 - 212."]}

Abyssorchomene shannonae sp. nov. urn:lsid:zoobank.org:act: EEBF5622-BB6E-4CA5-9767-4CFE71A4ED9F Figs 26–34 Diagnosis Pereonites 1–7 and pleonites 1–2 with a weak but distinct dorsoposterior hump on each segment. Lateral cephalic lobe broadly rounded, dorsal and ventral margins nearly equally convex. Antennae 1–2 of male with calceoli, female without. Epistome level with the upper lip. Maxilla 1 palp, distal end weakly convex with distal conical spines contiguous. Maxilliped inner plate, distal margin nearly straight, strongly beveled, with a very slight concavity on outer half, with mediodistal extension surpassing outer corner; outer plate with strongly scalloped inner margin. Coxa 1 strongly widened distally, ~ 1.5–1.7 × proximal width. Gnathopod 2 propodus of female broad, anterodistal margin slightly expanded and protruding, length ~ 1.5× width, (different in form to narrow male propod), dactylus very small, inserted on the posterodistal one-third of the distal margin, palm with a distinct concavity. Coxa 5 distinctly posterolobate, posteroventral lobe broadly rounded, posterior margin evenly rounded. Pereopod 7 basis with anterior margin slightly concave, distal half of posterior margin with a steep, strong bevel. Uropod 1 peduncle long, about 1.6× length of outer ramus. Uropod 3 inner ramus extends past distal end of article 1 and reaches 20–25% length of article 2 of outer ramus. Telson cleft 55% of length, deeper in males. Etymology The species name is dedicated to Shannon Hendrycks, the wife of the first author for her continued enthusiasm and support over the many years of this and other amphipod studies. Material examined Holotype EASTERN WEDDELL SEA • ♀ (12 mm, mature, figured, appendages on 7 slides); RV Polarstern ANT XXII-3 (ANDEEP III), station PS67-78-1; 71°9.91′ S, 014°4.80′ W; depth 2194 m; gear, baited traps; 21 Feb. 2005; C. De Broyer and B. Danis leg.; ZMH K-61209. Allotype EASTERN WEDDELL SEA • ♂ (7 mm, figured, appendages on 6 slides); same collection data as for holotype; ZMH K-61210. Paratypes EASTERN WEDDELL SEA • 2 ♀♀ (8.4 mm, with dissected Gn1–2, 9.5 mm); same collection data as for holotype; RBINS INV. 138.491 • 2 ♀♀ (8.4 mm, 11.8 mm); same collection data as for holotype; CMNC 2022-0009 • 2 ♀♀ (mature, 10 mm), 4 ♀♀ (immature, 7.5 mm), 4 ♂♂ (~ 6 mm); same collection data as for holotype; CMNC 2022-0010. Additional material EASTERN WEDDELL SEA • 6 specs (6–8 mm); RV Polarstern ANT XXII-3 (ANDEEP III), station PS67-80-1; 70°40.78′ S, 014°41.24′ W; depth 2928 m; gear, baited traps; 22 Feb. 2005; C. De Broyer and B. Danis leg.; RBINS INV. 138.492 • 2 ♀♀ (immature, 8.0 mm, 9.0 mm), 2 ♂♂ (5.6 mm, 7.0 mm); RV Polarstern ANT XXII-3 (ANDEEP III), station PS67-81-1; 70°31.63′S, 014°35.00′W; depth 4412 m; gear, baited traps; 23 Feb. 2005; C. De Broyer and B. Danis; RBINS INV. 138.496. NORTHWEST WEDDELL SEA • 1 ♀ (12.4 mm, mature); Powell Basin; RV Polarstern ANT XXII-3 (ANDEEP III), station PS67-142AT; 62°12.40′ S, 049°31.67′ W; depth 3411 m; gear, baited traps; 18 Mar. 2005; C. De Broyer and B. Danis leg.; RBINS INV. 138.497. SCOTIA SEA • 1 ♀ (12 mm, mature); US Antarctic Research Program, Eltanin 9, station 696; 56°53′ S – 56°59′ S, 037°27′ W – 037°17′ W; depth 3001 m; gear, Isaac-Kid Midwater Trawl; 28 Aug.1963; Smithsonian Oceanographic Sorting Centre, Washington, D.C. SOUTHWEST ATLANTIC • 2 ♀♀ (7 and 8 mm, immature), 1 ♂ (6 mm); Argentine Basin; RV Meteor, DIVA 3 M79/1 expedition, station 531; 35°56.49′ S, 048°53.85′ W; depth 4586 m; gear, baited traps; 15 Jul. 2009; E. Hendrycks leg.; ZMH K-61211. Description Holotype Mature female, 12 mm, ZMH K-61209. PEREONITES 1–7 AND PLEONITES 1–2 (Fig. 26). With a slight but distinct dorsoposterior hump on each segment. PLEONITE 3 (Fig. 26). With a rounded, posterodorsal elevation slightly overhanging urosomite 1. COXAE 1–2 (Fig. 26). Slightly shorter to nearly subequal to corresponding pereonites (in lateral view). COXAE 3–4 (Fig. 26). Subequal to slightly longer (1.15 ×) than corresponding pereonites. EPIMERON 3 (Fig. 26). Subquadrate, with posterodistal angle narrowly rounded and slightly obtuse, posterior margin very weakly convex, nearly straight, ventral margin convex. UROSOMITE 1 (Fig. 26). With a deep, broadly rounded dorsal concavity in front of the strong, regularly rounded, dorsal boss, slightly overhanging urosomite 2. LATERAL CEPHALIC LOBE (Fig. 26). Broadly rounded, dorsal and ventral margin nearly equally convex. EYE (Fig. 26). Non ommatidial, formed of pigment granules; long, relatively narrow, crescent shaped; extending parallel to the front head margin, length about two-thirds of the head height. ANTENNA 1 (Fig. 26). Peduncular article 1 dilated, length 1.3 × width; flagellum 13-articulate, length 1.5× peduncle, first article of flagellum callynophorate, densely furnished with double row of aesthetascs medially; accessory flagellum 5-articulate, first article wider and longer than remaining articles combined; calceoli absent. ANTENNA 2 (Fig. 26). Slightly longer (less than 1.3 ×) than antenna 1; geniculate between peduncular articles 3–4, peduncular articles 4–5 lined with anteromedial brush setae; flagellum 16-articulate, calceoli absent. EPISTOME (Fig. 26). Level with the slightly rounded upper lip, from which it is separated by a minute slit; forming long anterior cephalic ridge, weakly concave upward. UPPER LIP (Fig. 26). Anterior margin weakly convex, not protruding; midventral margin with a small, angular projection. MANDIBLE (Fig. 29). Incisor smoothly convex and slightly widened; left lacinia mobilis curved, with 2 strong and 1 weak apical teeth, right lacking; accessory spine row with 3 strong spines, interspersed with fine setae; molar forming a narrow crest, somewhat falciform, acutely produced on proximal end, setose with mixed ornamentation, distal half or third setiferous, proximal half or two-thirds forming a reduced, narrow, triturative surface, hairy process attached proximal to molar; palp attached proximal to molar, article 2 1.56 × length of article 3, with 27 A2 setae, article 3 falciform, 0.63 × length of article 2, with 1 A3-seta, 22 D3-pectinate setae and 3 E3 setae. LOWER LIP (Fig. 28). Outer lobes broad, slightly truncated medially and strongly setose, without inner lobes, mandibular lobes narrow. MAXILLA 1 (Fig. 28). Inner plate ovate, with small blunt distal projection surpassing the basal insertion of the 2 plumose apical setae; outer plate with 11 elongated spine-teeth in 7/4 crown arrangement; palp article 2 slightly widened at distal two-thirds, with 10 (left side) or 9 (right side) contiguous (or nearly contiguous) conical apical spines. MAXILLA 2 (Fig. 28). Outer and inner plates strongly tapering distally, both with strong rows of pectinate medial marginal spines and setae; inner plate much shorter than outer plate, with marginal setae on the distal half of the inner margin; apex of inner plate slightly surpassing the proximal end of setal row of outer plate. MAXILLIPED (Fig. 30). Inner plate short, subrectangular, just reaching the distal end of the inner margin of palp article 1 and reaching about 0.3× length of outer plate, distal margin not excavate, very weakly concave on outer half and sloped, with weak medio-distal extension, with 3 equally spaced, strongly embedded nodular spines, medial margin strongly setose; outer plate well developed, subovate, length 1.58× width, not reaching inner distal end of palp article 2, with two dissimilar apical spines and numerous (10–11) embedded, medial nodular spines, medial margin distinctly scalloped; palp strongly setose medially, article 4 well developed, about half the length of article 3, with 6 apically plumose setae on distal inner margin. GNATHOPOD 1 (Fig. 31). Coxa distinctly widened, distal width 1.53 × proximal width and about 80% of length, anterior margin slightly concave, anterodorsal corner broadly rounded, posterior margin slightly sinuous, the distal half weakly concave, slightly convex in posterior half, posteroventral corner nearly right angled, narrowly rounded; basis stout, not expanded, width one-third of the length, slightly narrower than propod, anterior margin with long setae; ischium subequal to merus; carpus short, about half the length of the propodus, with produced narrow posterodistal lobe, not guarding the hind margin of propodus; propodus subchelate, subrectangular, with anterior margin regularly convex, posterior margin distinctly concave, with inflexion point at distal two-thirds, palm transverse, microcrenulate, palm corner with 2 blunt protrusions and defined by 1 medial and 1 lateral spine; dactylus subequal to palm or barely overriding palm corner. GNATHOPOD 2 (Fig. 31). Carpus stout, length 2× propodus; propodus chelate, suboval, anterodistal margin broadly expanded and slightly protruding, surface finely setose with distal groups of long pectinate setae, broad, length 1.48 × width, slightly narrower (about 90%) than carpus, hind margin weakly but distinctly convex; dactylus very small, inserted on the posterodistal one-third of distal margin, forming a distinct, curved cavity with the slightly excavate palm. PEREOPOD 3 (Fig. 32). Coxa with anterior margin slightly convex, posterior margin slightly concave, length 2.3× width; rest of pereopod like pereopod 4. PEREOPOD 4 (Fig. 32). Coxa with posterodistal lobe broadly rounded distally, angle subquadrate, located slightly more distally (55%) than half of the coxa length; posterior margins of ischium-merus with clusters of long setae; propodus with 6 short spine groups; dactylus ~ 0.4 × length of propodus. PEREOPOD 5 (Fig. 32). Coxa distinctly posterolobate, posterior lobe broad and regularly convex, coxa width slightly greater than length; basis length 1.13× width, posterior margin with small serrations and setules, posterodistal lobe extending to distal margin of ischium; merus slightly expanded (0.63× length), longer than carpus and bearing anterior and posterior setae; carpus with anterior marginal setae; propodus narrow, length equal to merus-carpus. PEREOPOD 6 (Fig. 32). Coxa with posterodistal lobe broadly rounded; basis length 1.54 × width, posterior margin with 3–4 weak serrations, posterodistal lobe not reaching distal margin of ischium; merus slightly expanded (narrower than in P5) and bearing anterior long setae and few short slender posterior spines only; propodus slightly shorter than merus-carpus, with 6–7 clusters of short spines; dactylus 0.3× length of propodus. PEREOPOD 7 (Fig. 32). Coxa small, subovate; basis with anterior margin slightly concave, distal half of posterior margin strongly beveled, nearly straight, with very weak concavity and 9 weak serrations, posterodistal lobe not extending to distal margin of ischium; merus not expanded (narrower than in P6), anterior margins of merus-carpus with short spine groups, posterior margin bearing few short slender spines; propodus slightly shorter than merus-carpus; dactylus 0.3× length of propodus. UROPOD 1 (Fig. 33). Peduncle long, about 1.6 × length of outer ramus and 1.74 × length of inner ramus, dorsolateral and dorsomedial margins spinose; inner ramus slightly shorter than outer, margins of rami with slender spines except medial margin of outer ramus, which lacks spines. UROPOD 2 (Fig. 33). Peduncle about 1.2× length of outer ramus, dorsolateral and dorsomedial margins with 4 and 3 spines respectively; inner ramus very slightly shorter than outer ramus; outer ramus with closely spaced slender spines on dorsolateral margin; inner ramus margins with slender spines. UROPOD 3 (Fig. 33). Peduncle long, 0.8 × length of biarticulated outer ramus; second article of outer ramus 0.46 × length of article 1; inner ramus extends past distal end of article 1 and reaches 20–25% of article 2 of outer ramus; inner margins of rami with long plumose setae and slender spines. TELSON (Fig. 33). 1.6 × longer than wide, relatively deeply cleft (55%), lobes tapering distally with 4 lateral, submarginal spines and 1 distal spine. GILLS 5–6 (Fig. 32). With 1 long tubular accessory lobe on gill 5 and 2 on gill 6. GILL 7 (Fig. 32). Present, well developed. BROOD PLATES (Fig. 32). On gnathopod 2 and pereopods 3–5, long, slender and curved distally, largest on gnathopod 2 and pereopods 3–4, with long curved brood setae, 20 setae on pereopod 4 plate and 12 on pereopod 5. STOMODEUM (Fig. 26). Extending to the 7 th pereonite. Male ( Allotype 7 mm, ZMH K-61210). Similar to female, but differing as follows: BODY. Smaller than female, and slightly less robust. LATERAL HEAD LOBE. Slightly narrower. ANTENNA 1 (Fig. 27). Peduncular article 1 stouter, more compact; callynophore stronger, flagellum 8-articulate, articles shorter, with calceoli. ANTENNA 2 (Fig. 27). Flagellum 12-articulate with calceoli. MAXILLA 1 (Fig. 28). Palp with 7 distal, conical spines; inner plate, distal projection acute. MAXILLIPED (Fig. 30). Inner plate, distal margin slightly more excavate. PEREOPODS (Fig. 34). Slightly more slender. GNATHOPOD 1 (Fig. 34). Coxa more strongly widened, distal width about 1.7 × proximal width; basis distinctly narrower than propodus, anterior margin lacking long setae. GNATHOPOD 2 (Fig. 34). Coxa slightly narrower and distally widening; propodus slender, length 2.5 × width, about ⅔ of carpus width, slightly expanded anteriorly, with straight hind margin, palm lacking concavity. COXA 3 (Fig. 34). Slightly narrower and widening distally. COXA 4 (Fig. 34). Slightly narrower, ventral margin more evenly convex and posteroventral lobe slightly smaller. COXA 5. Slightly more posterolobate. UROPOD 2 (Fig. 33). Peduncle shorter, about 1.13 × length of outer ramus, distolateral marginal spines of peduncle grouped at distal end; inner ramus distinctly shorter than outer; outer ramus distolateral spines stouter, bluntly rounded and more closely spaced distally, proximal spine acute (see p. 24). UROPOD 3 (Fig. 33). Peduncle shorter, 0.68 × length of biarticulated outer ramus. TELSON (Fig. 33). Cleft deeper (60%) than female. UROSOMITE 1 (Fig. 26). Dorsal boss more unevenly rounded and slightly more protruding upward. EPIMERON 3 (Fig. 26). Posteroventral corner slightly more subquadrate. Distribution Southern Ocean: Eastern Weddell Sea (De Broyer et al. 2006); Northwestern Weddell Sea: Powell Basin (De Broyer et al. 2006); Scotia Sea (this paper). Southwest Atlantic: Argentine Abyssal Basin (this paper). Depth range Bottom records: 2194 m (De Broyer et al. 2006) to 4586 m (this paper). Pelagic records: 3001 m (this paper). Remarks Abyssorchomene shannonae sp. nov. is easily differentiated from the smooth bodied Antarctic species A. scotianensis (Andres, 1983) in possessing a slight, but distinct dorsoposterior rounded hump on pereonites 1–7 and pleonites 1–2. The new species also differs from A. scotianensis by the very steeply angled, truncate bevel of the basis of pereopod 7 (vs weakly angled bevel) and the uropod 3 inner ramus length, which greatly exceeds the distal end of article 1 of the outer ramus (vs just reaching the distal end). Abyssorchomene shannonae sp. nov. is superficially very similar to A. abyssorum and A. patriciae sp. nov., as these species also possess the dorsoposterior hump on the pereonites and pleonites. However, A. shannonae differs from both these species in many characters. From A. abyssorum, it differs in the much greater distally widened coxa 1 (1.4–1.7× proximal width vs 1.2×); the (mature) female gnathopod 2 propodus which is broad, with a palm concavity (length less than 1.5 × width vs narrow, ~ 2.4× width and lacking concavity); the coxa 5 posteroventral lobe which is broadly rounded (vs narrowly rounded); the very strongly, steeply angled truncated bevel of the basis of pereopod 7 (vs weakly angled bevel) and the shorter uropod 3 inner ramus, which extends to about 20–25% of the length of article 2 of the outer ramus (vs extends to 70% of the length of article 2 of the outer ramus). Lastly, from A. patriciae sp. nov. it differs in the shape of the lateral head lobe, with dorsal and ventral margins nearly similar (vs dorsal and ventral margins not similar, dorsal margin strongly convex, ventral margin nearly straight); the female gnathopod 2 propodus with anterodistal margin broadly expanded and protruding, dactylus tiny, inserted near the bottom of the distal margin (vs anterodistal margin not expanded and protruding, dactylus large, inserted at the top of the distal margin); the coxa 5 posteroventral lobe which is broadly and evenly rounded (vs narrowly rounded, posterior margin straight posterodistally); the longer uropod 1 peduncle, which is 1.6 × the length of the outer ramus (vs 1.45 ×) and the length of the uropod 3 inner ramus, which reaches to 20–25% of article 2 of uropod 3 outer ramus (vs reaching to ~ 63% of article 2 of outer ramus).

Abyssorchomene patriciae sp. nov. urn:lsid:zoobank.org:act: 267EAAEE-5F5C-4DAA-93F9-014B36F6B0AB Figs 10–17 non Abyssorchomene abyssorum – Thurston 1990: 262–263, 269 (= A. patriciae in part; part = A. cf. patriciae; T. Horton, pers. com.). —? Jones et al. 1998: 1124–1125. — Gutteridge 2012: 5, 22, 24 (= A. patriciae; T. Horton, pers. com.). — Corrigan et al. 2013: 156, 158–161 (= A. cf. patriciae). — Duffy et al. 2013: 360–368 (= A. patriciae; T. Horton, pers. com.). — Horton et al. 2013: 352, 354–358 (= A. patriciae; T. Horton, pers. com.). — Priede et al. 2013: 8 (= A. cf. patriciae). — Horton et al. 2020: 6–7, 11 (= A. patriciae; T. Horton, pers. com.). Diagnosis Pereonites 1–7 and pleonites 1–2 with a slight but distinct dorsoposterior hump on each segment. Lateral cephalic lobe broadly rounded, dorsal and ventral margins slightly dissimilar in shape, dorsal margin strongly convex, ventral margin nearly straight with a very slight concavity. Antennae 1–2 of male with calceoli, female without. Epistome level with and scarcely differentiated from upper lip. Maxilla 1 palp distal end weakly convex and with conical apical spines contiguous. Maxilliped inner plate, distal margin shallowly but distinctly concave, with a very weak mediodistal extension; outer plate inner margin very weakly scalloped. Coxa 1 distinctly widened, distal width 1.3× proximal width or greater. Gnathopod 2 propodus of female broadened, subovate, length 1.7× width (different in form to narrow male propodus), dactylus large, inserted at the top of distal margin and occupying most of the length (~ 85%) of the distal margin, forming a distinct, small gap on the palm. Coxa 5 posteroventral lobe narrowly rounded, posterior margin with distinct straight section. Pereopod 7 basis, posteroventral corner shallowly and weakly beveled. Uropod 1 peduncle relatively short, length less than 1.5 × length of outer ramus. Uropod 3 inner ramus extends to ~ 63% of article 2 of uropod 3 outer ramus. Telson cleft ~ 52% of length. Etymology The species name is dedicated to Patricia De Broyer, the daughter of the co-author. Material examined Holotype NORTHEAST ATLANTIC • ♀ (mature, 10.5 mm, figured, appendages on 3 slides); Porcupine Abyssal Plain; RRS James Cook (2011), station JC 062-063; 49°05.3′ N, 16°40.0′ W; depth 4848 m; gear, baited traps, A-trap B2; 8 Aug. 2011; NHM UK 2022.6 (see Horton et al. 2020). Allotype NORTHEAST ATLANTIC • 1 ♂ (7.5 mm, figured, appendages on 3 slides); same collection data as for holotype; NHM UK 2022.7. Paratypes NORTHEAST ATLANTIC • 3 ♀♀ (7.0– 10.8 mm), 2 ♂♂ (5.5–7.0 mm); same collection data as for holotype; NHM UK 2022.8 • 3 ♀♀, 2 ♂♂; same collection data as for holotype; CMNC 2022-0002 • 3 ♀♀, 3 ♂♂; same collection data as for holotype; RBINS INV. 138.487. Additional material NORTHEAST ATLANTIC • 10 specs (♀♀ & ♂♂); same collection data as for holotype; NHM UK 2022.9 • 20 specs (♀♀ & ♂♂); same collection data as for holotype; CMNC 2022-0003 • 20 specs (♀♀ & ♂♂); same collection data as for holotype; RBINS INV. 138.488. NORTHWEST ATLANTIC • 2 ♀♀ (7.5–8.5 mm); Mid-Atlantic Ridge area, north of Charlie-Gibbs Fracture Zone; RRS James Cook (2009), station JC 037-060; 53°58.46′ N, 36°06.12′ W; depth 2340 m; gear baited traps; 27–30 Aug. 2009; CMNC 2022-0004 • 3 ♀♀; same collection data as for preceding; RBINS INV. 138.489. Description Holotype Mature female, 10.5 mm, NHM UK 2022.6. PEREONITES 1–7 AND PLEONITES 1–2 (Figs 10–11). With a slight but distinct dorsoposterior hump on each segment (note: Fig. 10 is of male, but female is similar). PLEONITE 3 (Fig. 11). With a rounded, posterodorsal elevation slightly overhanging urosomite 1. COXAE 1–2 (Fig. 10). Slightly shorter than corresponding pereonites (in lateral view) (note: Fig. 10 is of male, but female is similar). COXAE 3–4 (Fig. 10). Slightly longer (~1.2×) than corresponding pereonites (note: Fig. 10 is of male, but female coxae are slightly deeper). EPIMERON 3 (Fig. 11). Subquadrate, with posterodistal angle very slightly obtuse, posterior margin weakly but regularly convex, ventral margin convex. UROSOMITE 1 (Fig. 11). With a deep, narrow dorsal concavity in front of the strongly projecting, slightly unequally rounded, dorsal boss, slightly overhanging urosomite 2. HEAD (Fig. 11). Slightly longer (1.13×) than pereonite 1. LATERAL CEPHALIC LOBE (Fig. 11). Broadly rounded, dorsal and ventral margin not similar in shape, dorsal margin strongly convex, ventral margin nearly straight with a slight concavity. EYE (Fig. 11). Non ommatidial, formed of pigment granules; long, narrow, L-shaped, extending parallel to the front head margin, length about 63% of the head height (note: eye shape and size are best observed with fresh specimens, as over time in preservation the labile components of the eye pigments can be lost, causing the eyes to become extremely difficult to ascertain- see eye of freshly collected male, Fig. 10). ANTENNA 1 (Fig. 11). Peduncular article 1 dilated (length 1.3× width), without small dorsal keel projecting distally over article 2; flagellum broken after the sixth article (likely with 9–10 articles counted from 6 other females), length 1.5 × peduncle, first article of flagellum callynophorate, densely furnished medially with double row of aesthetascs; accessory flagellum 5-articulate, first article slightly broader and longer than remaining articles combined, calceoli absent. ANTENNA 2. Slightly longer (less than 1.3×) than antenna 1; geniculate between peduncular articles 3–4, peduncular articles 4–5 lined with anteromedial brush setae; flagellum 12-articulate, calceoli absent. EPISTOME (Fig. 11). Level with and scarcely differentiated from upper lip, forming long anterior cephalic ridge, weakly concave. UPPER LIP (Fig. 12). Not protruding, with an asymmetrical midventral, angular projection. MANDIBLE (Fig. 12). Incisor strongly convex and widened; left lacinia mobilis curved, with 2 strong apical teeth, right lacking; accessory spine row with 3 strong spines, interspersed with fine setae; molar forming a narrow crest, somewhat falciform, acutely produced on proximal end, setose with mixed ornamentation, distal half or third setiferous, proximal half or two-thirds forming a reduced, ridged triturative surface, hairy process attached proximal to molar; palp attached proximal to molar, article 2 1.65 × length of article 3, with 17 A2 setae, article 3 falciform, 0.61× length of article 2, with 1 A3-seta, 20 D3-pectinate setae and 3 E3-setae. LOWER LIP. Outer lobes broad with inner margins strongly setose, distal inner margins excavated; without inner lobes, mandibular lobes narrow, rounded. MAXILLA 1 (Fig. 12). Inner plate with small, distal subtriangular projection surpassing the basal insertion of the 2 subapical plumose setae; outer plate with 11 elongated spine-teeth in 7/4 crown arrangement; palp article 2 strongly widened at distal two-thirds, with 10 (left side) or 9 (right side) contiguous conical apical spines, and one apical strong seta on outer corner. MAXILLA 2 (Fig. 13). Outer and inner plates tapering distally, both with strong rows of pectinate medial marginal spines and setae; inner plate much shorter and distinctly narrower than outer plate, with marginal setae on the distal third of the inner margin, distal end of inner plate not reaching the proximal end of setal row of outer plate. MAXILLIPED (Fig. 13). Inner plate subrectangular, extending slightly past the distal end of the inner margin of palp article 1 and reaching about 0.34 × length of outer plate, distal margin shallowly but distinctly concave, with very weak mediodistal extension, not surpassing the level of the weak outer extension, with 3 strongly embedded nodular spines, the two mediodistal marginal nodular spines situated close to each other, the third one located in about the middle of the plate, medial margin strongly setose; outer plate elongated, subovate, length 1.83× width, reaching the distal end of palp article 2, with two dissimilar apical spines and numerous (12) embedded, medial nodular spines, medial margin very slightly scalloped; palp strongly setose medially, article 4 well developed, about 0.56 × length of article 3, inner margin with 2–3 distal setae. GNATHOPOD 1 (Fig. 14). Coxa distinctly widened, distal width 1.3× proximal width and about 76% of length, anterior margin concave, anterodorsal corner rounded, posterior margin nearly straight, distal margin strongly convex in anterior half, weakly convex in posterior half, posteroventral corner not narrowly rounded; basis stout, width about one third of the length and similar to propod width, anterior margin with very short setae; ischium subequal to merus, both with posterior margins setose; carpus short, about half the length of the propodus, with produced narrow posterodistal lobe, not guarding the hind margin of propodus; propodus subchelate, subrectangular, slightly narrowing distally, with anterior margin regularly convex, posterior margin slightly concave, with a distinct inflexion at distal two-thirds, palm transverse, microcrenulate, palmar corner with 2 blunt protrusions and defined by 1 medial and 1 lateral spine; dactylus subequal to palm or barely overriding palm corner. GNATHOPOD 2 (Fig. 15). Coxa subrectangular, length 2.2 × width; basis elongated, distal third slightly curved, length 7.3× width; ischium length 2.7 × width; carpus stout, length 2 × width, about 1.6 × propodus; propodus chelate, subovate, length 1.72 × width, widest subproximally and about 75% of the carpus width, surface finely setose with distal groups of long pectinate setae, dorsal margin strongly convex, hind margin weakly convex, nearly straight; dactylus large, inserted at the top of the distal margin and occupying most of the length (~ 85%) of the distal margin, forming a distinct, small gap on the palm. PEREOPOD 3 (Fig. 16). Coxa with anterior margin very slightly convex, posterior margin nearly straight, length 2.3× width; posterior margins of ischium-merus with clusters of long setae; rest of pereopod as in pereopod 4. PEREOPOD 4 (Fig. 16). Coxa length 1.4 × width, width 0.7 × length, anterior margin strongly convex, posterior margin deeply excavate, with wide subtriangular, posterodistal lobe, ventral margin straight, angle subrectangular with rounded apex, located at distal 70% of the coxa length; posterior margins of ischium-merus with clusters of long setae; propodus with 4–5 short spine groups; dactylus 0.43× length of propodus. PEREOPOD 5 (Fig. 16). Coxa slightly but distinctly posterolobate, posterior lobe narrowly rounded, irregularly convex, with distal half of posterior margin straight, width slightly exceeding (1.12 ×) length; basis slightly longer (1.1 ×) than wide, regularly narrowing distally from halfway along the posterior margin, with 4 weak serrations, posterodistal lobe extending to distal margin of ischium; merus weakly expanded (width 0.66 × length), longer than carpus and bearing anterior and posterior long setae; carpus with anterior marginal setae; propodus narrow, length equal to merus-carpus, with 4–5 anterior marginal short spine groups; dactylus short, length 0.34 × propodus. PEREOPOD 6 (Fig. 16). Basis long, length 1.5× width, posterior margin with 8 weak serrations, posterodistal lobe not reaching distal margin of ischium; merus slightly expanded (slightly narrower than in P5) and bearing anterior marginal long setae and few short slender posterior spines; propodus equal in length to merus-carpus, anterior margin with 4–5 clusters of short spines; dactylus 0.33× length of propodus. PEREOPOD 7 (Fig. 16). Coxa subovate, length slightly shorter than width; basis proximal two-thirds subrectangular, anterior margin slightly concave, distal third of posterior margin with a relatively strongly angled bevel, with about 9 weak serrations, posterodistal lobe not extending to distal margin of ischium; merus not expanded (narrower than in P6), anterior margins of merus-carpus with short spine groups, posterior margin bearing few short slender spines; propodus about equal to merus-carpus; dactylus 0.33× length of propodus. UROPOD 1 (Fig. 17). Peduncle about 1.45 × length of outer ramus and 1.64× inner ramus, dorsolateral and dorsomedial margins spinose; inner ramus shorter and more spiniferous than outer ramus; outer ramus medial margin lacking spines. UROPOD 2 (Fig. 17). Peduncle length 1.2× outer ramus, dorsolateral and dorsomedial margins with 5 and 1 spine respectively; inner ramus slightly shorter than outer ramus, outer ramus with 10 closely spaced slender spines on dorsolateral margin; inner ramus margins with 2 and 3 slender spines. UROPOD 3 (Fig. 17). Peduncle 0.77 × length of biarticulate outer ramus; second article of outer ramus 0.38× length of article 1; inner ramus extends past distal end of article 1 of outer ramus and reaches 0.63× length of article 2 of outer ramus, inner margins of rami with long plumose setae and outer margins with a few slender spines. TELSON (Fig. 17). 1.7 × longer than wide, cleft (52%), lobes tapering distally with 2–3 lateral, submarginal spines and 1 distal spine set in middle of lobe tip. GILLS 5 AND 6 (Fig. 16). With 1 long, tubular accessory lobe on gill 5 and 2 lobes on gill 6. GILL 7 (Fig. 16). Present, well developed. BROOD PLATES (Figs 15–16). Present on gnathopod 2 and pereopods 3–5, long, slender and curved distally, largest on gnathopod 2 and pereopods 3–4, smallest on pereopod 5, with long curved brood setae ranging in number from 11–24. STOMODEUM. Extending to the 7 th pereonite. Male (Allotype 7.5 mm, NHM UK 2022.7). Similar to female, but differing as follows: BODY (Fig. 10). Smaller and generally less robust. HEAD (Figs 10–11). Slightly longer (1.27×) than pereonite 1. LATERAL HEAD LOBE (Figs 10–11). Narrower distally and dorsal margin not as strongly convex. ANTENNA 1 (Fig. 11). Longer relative to body length than female, peduncle 1 stouter, length very slightly greater than width; callynophore stronger, flagellar articles shorter, with calceoli. ANTENNA 2 (Fig. 11). Longer relative to body length than female, flagellum 14-articulate, with calceoli. MANDIBLE (Fig. 12). Palp article 2 shorter, length 1.5 × article 3. MAXILLA 1 (Fig. 12). Inner plate, distal projection more acute. MAXILLIPED (Fig. 13). Inner plates, distal margin more deeply excavated. PEREOPODS (Figs 14, 17). Coxae narrower; rest of pereopods slightly more gracile. GNATHOPOD 1 (Fig. 14). Coxa slightly less widened, anteroventral corner more narrowly rounded; basis distinctly narrower than propodus. GNATHOPOD 2 (Fig. 14). Coxa narrower and slightly widened distally; propodus distinctly narrower, length 2.48 × width and about 61% of carpus width, with straight hind margin, palm without a gap. COXA 4 (Fig. 17). Distinctly narrower, with posterodistal lobe more regularly convex. PEREOPOD 5 (Fig. 17). Merus more strongly expanded (width 0.7× length). UROPOD 2 (Fig. 17). Distolateral marginal spines of peduncle grouped closely together; inner ramus distinctly shorter than outer; outer ramus distolateral spines much stouter, bluntly rounded and more closely spaced, proximal ones are slender and sharp (see comment, p. 24). UROSOMITE 1 (Fig. 10). Boss slightly more protruding. Distribution Northeast and Central North Atlantic: Porcupine Abyssal Plain (Thurston 1990); Biscay Abyssal Plain? Cape Verde Basin? (Thurston 1990: identifications to be confirmed); Mid-Atlantic Ridge vicinity (Horton et al. 2013) Depth range Bottom records: 2340 m (Horton et al. 2013) to 4849 m (Thurston 1990). Pelagic records: 0–20 to 500–1000 m above bottom (Thurston 1990, identifications to be confirmed). Remarks In many subtle ways, the new species Abyssorchomene patriciae sp. nov. appears to be a pseudocryptic species, with a facies very superficially similar to both the north and southwest Atlantic species A. abyssorum (Stebbing, 1888) and the southwest Atlantic-Antarctic new species A. shannonae sp. nov. (this paper). For instance, these three species all possess the slight, but distinct dorsoposterior rounded hump on pereonites 1–7 and pleonites 1–2, which is unique among Abyssorchomene. As well, the uropod 3 inner ramus extends past the distal end of article 1 of the outer ramus of uropod 3. These characters easily differentiate A. abyssorum, A. patriciae and A. shannonae from the Southern Ocean endemic A. scotianensis (Andres, 1983). In general body shape and form, they are all extremely similar. However, upon critical examination, we have found several detailed morphological characters that differentiate A. patriciae sp. nov. as follows (character of A. abyssorum in brackets). From A. abyssorum, it differs in the shape of the lateral head lobe, with dorsal and ventral margins not similar, dorsal margin strongly convex, ventral margin nearly straight with slight concavity (vs dorsal and ventral margins more similar, dorsal margin weakly convex and ventral margin straighter); coxa 1 is distinctly widened distally and the anterodorsal corner is broadly rounded in the female (vs only very slightly widened and the anterodorsal corner is narrowly rounded in the female); the mature female gnathopod 2 propodus broadened, subovate, length ~ 1.7 × width, dactylus large, inserted at the top of the distal margin and occupying most of the distal margin, with a small palmar gap (vs propodus very slender, similar to male, length ~ 2.5 × width, dactylus tiny, without a palmar gap); the shorter uropod 1 peduncle, which is 1.45 × the length of the outer ramus (vs longer uropod 1 peduncle, which is 1.5–1.7 × the outer ramus) and the length of the uropod 3 inner ramus, which reaches to ~ 63% of article 2 of uropod 3 outer ramus (vs reaching to ~ 70% of article 2 of outer ramus). The broadened gnathopod 2 propodus of mature females is not found in smaller, immature females and is likely a terminal growth stage character which presents at maturity, when brood plates are fully formed with long brood setae. Immature females possess a gnathopod 2 propodus which approximates the condition found in males. These are slender and lack the palmar concavity. This makes these taxa difficult to separate without mature females; howev

Genus Abyssorchomene De Broyer, 1984 Abyssorchomene De Broyer, 1984: 198. Abyssorchomene – Barnard & Karaman 1991: 507 (in part). — Lowry & Kilgallen 2014: 6–8. Type species Orchomenopsis chevreuxi Stebbing, 1906, original designation., Published as part of Hendrycks, Ed A. & Broyer, Claude De, 2022, New deep-sea Atlantic and Antarctic species of Abyssorchomene De Broyer, 1984 (Amphipoda, Lysianassoidea, Uristidae) with a redescription of A. abyssorum (Stebbing, 1888), pp. 1-76 in European Journal of Taxonomy 825 on pages 3-5, DOI: 10.5852/ejt.2022.825.1829, http://zenodo.org/record/6686625, {"references":["Barnard J. L. & Karaman G. S. 1991. The families and genera of Marine Gammaridean Amphipoda (Except Marine Gammaroids). Records of the Australian Museum. Supplement 13: 1 - 866. https: // doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Lowry J. K. & Kilgallen N. M. 2014. A generic review of the lysianassoid family Uristidae and description of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae). Zootaxa 3867 (1): 1 - 92. https: // doi. org / 10.11646 / zootaxa. 3867.1.1","Stebbing T. R. R. 1906. Amphipoda. I. Gammaridea. Das Tierreich 21: 1 - 806. Friedlander, Berlin. https: // doi. org / 10.5962 / bhl. title. 1224"]}

Abyssorchomene scotianensis (Andres, 1983) Figs 18–25 Orchomene scotianensis Andres, 1983: 205–212, figs 10–12. Orchomenopsis chilensis f. abyssorum Schellenberg, 1926: 291–292, fig. 27. Orchomenella abyssorum – Barnard K.H. 1932: 69, figs 27b, 28 (= Abyssorchomene cf. scotianensis , except fig. 27b = Abyssorchomene abyssorum). — Nicholls 1938: 35, fig. 15 (= Abyssorchomene cf. scotianensis). — Dahl 1954: 282 (= Abyssorchomene cf. scotianensis). — Birstein & Vinogradov 1962: 41 (= Abyssorchomene cf. scotianensis). Orchomene abyssorum – Arnaud 1974: 572 (ecology). — Lowry & Bullock 1976: 94–95 (in part). — Lowry 1982: 320. — Wakabara et al. 1990: 2, 4, 6 (= Abyssorchomene cf. scotianensis). — Barnard & Karaman 1991: 508 (in part). Abyssorchomene abyssorum – De Broyer 1983: 142–144 (in part). — De Broyer & Jażdżewski 1993: 64. — De Broyer et al. 1999: 166; 2001: 746, 749 (ecology); 2004: 1742, table 4 (ecology); 2007: 163. — Havermans et al. 2010: 204–207; 2011: 232, 235. — Havermans 2012: 96, 99–101, 104, 106–107, 116, 122, 156, 181, 195–196, 215, 226, 250–251, 260, 262. Orchomene (Abyssorchomene) abyssorum – Barnard & Ingram 1990: 26 (in discussion = in part). Orchomene sp. “L-shaped eye” – d’Udekem d’Acoz & Robert 2008: 51, 54. Abyssorchomene “L-shaped eye”, Abyssorchomene cf. scotianensis – Havermans et al. 2012: 36, 39. Abyssorchomene sp. n. aff. scotianensis – d’Udekem & Havermans 2012: fig. 31. New diagnosis Pereonites 1–7 and pleonites 1–2 smooth, without any dorsoposterior humps. Lateral cephalic lobe broadly rounded, dorsal and ventral margins regularly and nearly equally convex. Antennae 1–2 of male with calceoli, female without. Epistome weakly but distinctly protruding in front of upper lip (or level with upper lip). Maxilla 1 palp distal end strongly convex, with conical distal spines not contiguous. Maxilliped inner plate, distal margin regularly beveled, very slightly concave, with mediodistal extension slightly surpassing the level of the outer corner; outer plate inner margin weakly scalloped. Coxa 1 distinctly widened, distal width ~ 1.4 × proximal width. Gnathopod 2 propodus of female slender, length ~3 × width (similar in form to male), dactylus small, inserted in the middle of the distal margin, lacking a palm concavity. Coxa 5 slightly but distinctly posterolobate, posterior lobe irregularly convex, with distal half of posterior margin nearly straight. Pereopod 7 basis, distal third of posterior margin with a straight bevel. Uropod 1 peduncle length ~ 1.6 × length of outer ramus. Uropod 3 inner ramus barely reaches (or very slightly exceeds) distal end of article 1 of uropod 3 outer ramus. Telson cleft ~ 50% in female, more deeply cleft (up to 60%) in male. Material examined Paratypes SCOTIA SEA • 1 ♀ (9.0 mm), 1 juvenile (2.7 mm); FFS Walther Herwig, station 210, Hol 239; 63°22′ S, 054°10′ W; depth 0–223 m (bottom depth 235 m); gear, Rectangular Midwater Trawl (RMT) 1+ 8; 13 Jan. 1978; A. Baker and F. Nast leg.; ZMH K 32 401. Additional material WESTERN WEDDELL SEA • 1 ♀ (mature, 12 mm, figured, appendages on 2 slides); off East Peninsula, Larsen B; RV Polarstern ANT XXIII-8 (IPY-CAML), station PS69-706-7; 65°26.57′ S, 061°26.82′ W; depth 828 m; gear, fish traps; 15 Jan. 2007; C. d’Udekem d’Acoz and H. Robert leg.; CMNC 2022-0005 • 1 ♀ (9.5 mm, head figured); same collection data as for preceding; CMNC 2022-0006 • ♂ (12.4 mm, figured, appendages on 2 slides); same collection data as for preceding; CMNC 2022-0007 • 9 ♂♂ (8–11 mm); same collection data as for preceding; RBINS INV. 138.498 • 2 ♂♂, 2 ♀♀, 2 juveniles; same collection data as for preceding; RBINS INV. 138.490 • 1 ♂, 1 ♀; same collection data as for preceding; RBINS INV. 138.493 • 51 specs (♀ up to 11.4 mm); same collection data as for preceding; RBINS INV. 138.494 • 50 specs (♀ up to 11.0 mm); same collection data as for preceding; CMNC 2022-0008. ROSS SEA • 2 ♂♂ (8.6 mm, 5.5 mm), 2 ♀♀ (5.8 mm, 5.5 mm); Ross Ice Shelf, station J9; 82°22′30″ S, 168°37′33″ E; depth 600 m (under ice 415 m thick); gear, baited traps; 7–29 Dec. 1977; T. DeLaca and W.L. Stockton leg.; RBINS INV. 138.495. See Stockton & DeLaca (1982). SOUTHERN OCEAN • 3 ♂♂ (10–13.1 mm); Oates Coast, off Oates Land; RV Ob, 3 rd Soviet Antarctic Expedition. (SAE 3), station 337; 69°48′ S, 161°49′ E; depth 1040 m; 10 Feb.1958; A.P. Andriashev (Zoological Institute Russian Academy of Sciences, St. Petersburg). AMUNDSEN SEA • 1 ♀ (10 mm, with 13 advanced stage embryos), 1 ♀? (5.7 mm), ♂ (5.8 mm); RRS James Clark Ross, JR 179, BIOPEARL II, station BIO5-EBS-2A; 73°52'55" S, 106°18'33" W; depth 1113 m; gear, epibenthic sledge; 9 Mar. 2008; K. Linse (British Antarctic Survey, Cambridge). Description Based on female (mature), 12 mm (CMNC 2022-0005); paratype female, 9 mm, (not illustrated, ZMH K 32 401) and on remaining material described by Andres (1983). PEREONITES 1–7 AND PLEONITES 1–2 (Fig. 18). Body smooth, without dorsoposterior hump on each segment. PLEONITE 3 (Figs 18–19). With a distinct, rounded posterodorsal elevation slightly overhanging urosomite 1. COXAE 1–2 (Figs 18–19). Subequal to slightly longer (1.1 ×) than corresponding pereonites. COXAE 3–4 (Fig. 18). Slightly longer (1.2×) than corresponding pereonites. EPIMERON 3 (Figs 18–19). Subquadrate, with posterior margin weakly convex, posteroventral corner broadly rounded, with angle slightly obtuse, ventral margin regularly convex. UROSOMITE 1 (Fig. 19). With a deep, dorsal concavity in front of the strongly, regularly rounded upright dorsal boss, convex on posterior margin, and slightly overhanging urosomite 2. HEAD (Fig. 19). About equal in length to pereonite 1. LATERAL CEPHALIC LOBE (Fig. 19). Broadly rounded, dorsal and ventral margins regularly and nearly equally convex. EYE (Fig. 19). Non ommatidial, formed of pigment granules; large, crescent-shaped or L-shaped, parallel to front head margin, length about 70% of the head height (note: see p. 26, 34 for comments on evaluating eye size/shape). ANTENNA 1 (Fig. 19). Peduncular article 1 dilated (length 1.2 × width), without anterodistal lobe; flagellum article 1 about half length of peduncular article 1, callynophorate, densely furnished medially with double row of aesthetascs; accessory flagellum 5-articulate, first article long, about equal to the remaining articles combined; flagellum 13-articulate, calceoli absent. ANTENNA 2 (Fig. 19). Slightly longer (1.2 ×) than antenna 1; geniculate between peduncular articles 3–4, peduncular articles 4–5 lined with anteromedial brush setae, peduncular article 5 short, length 0.66 × article 4; flagellum 18-articulate, calceoli absent. EPISTOME (Fig. 19). Level with or very slightly protruding in front of weakly rounded upper lip, forming straight anterior margin and cephalic ridge, separated from upper lip by a small slit. MANDIBLE (Fig. 20). Incisor strongly convex, slightly widened; left lacinia mobilis curved, with 2 strong apical teeth and 1 subapical tooth, right lacking; accessory spine row with 3 strong spines, interspersed with fine setae; molar forming a narrow crest, somewhat falciform, acutely produced on proximal end, setose with mixed ornamentation, distal half or third setiferous, proximal half or two-thirds forming a reduced, ridged triturative surface, hairy process located proximal to molar; palp attached proximal to molar, article 2 1.8× length of article 3, with 24–25 A2-pectinate setae, article 3 weakly falciform, 0.55 × length of article 2, with 3 A3-seta, 26 D3-pectinate setae and 2 E3-setae. LOWER LIP (Fig. 20). Outer lobes broad with inner margins strongly setose, distal margins excavate, without inner lobes, mandibular lobes narrow. MAXILLA 1 (Fig. 21). Inner plate with short, rounded, apical projection slightly surpassing the basal insertion of two (or three) apical plumose setae of unequal size; outer plate with 11 strong spine-teeth in 7/4 crown arrangement; palp article 2 slightly widened at distal two-thirds, distal margin strongly convex, with 7–9 non-contiguous conical apical spines, and a thin spine on outer corner. MAXILLA 2 (Fig. 21). Outer and inner plates not slender, tapering distally, both with strong rows of pectinate medial marginal spines and setae; inner plate much shorter than outer plate, with marginal setae on the distal third of the inner margin, distal end of inner plate slightly surpassing the proximal end of setal row of outer plate. MAXILLIPED (Fig. 21). Inner plate subrectangular, extending slightly past the distal end of the inner margin of palp article 1 and reaching about one-third length of outer plate, distal margin regularly bevelled, very slightly concave, with mediodistal extension slightly surpassing the level of the outer corner; with 3 embedded nodular spines unequally spaced, the two mediodistal marginal nodular spines situated close to each other with the corner one more protruding, the third one located closer to the outer margin corner, plumose setae inserted along medial margin and inner part of distal margin; outer plate subovate, length 1.66 × width, not reaching distal end of palp article 2, with two dissimilar apical spines and numerous (11) embedded, medial nodular spines, medial margin weakly scalloped; palp 4-articulate, strongly setose medially, dactylus well developed, about 0.7 × length of article 3, distal inner margin with 2–3 short setae. GNATHOPOD 1 (Fig. 22). Coxa distinctly widened, distal width 1.43 × proximal width and about 78% of length, anterior margin weakly concave, anterodorsal corner broadly rounded, posterior margin nearly straight, distal margin strongly convex in anterior half, slightly convex in posterior half, posteroventral corner not narrowly rounded; basis moderately stout, width about one third of the length and slightly narrower than propodus, anterior margin with numerous long and short setae; ischium subequal to merus, both with posterior margins setose; carpus short, compressed, length about 0.5 × propodus, with narrow, setose posterodistal lobe, not guarding the hind margin of propodus; propodus subchelate, subrectangular, with anterior margin weakly convex, posterior margin nearly straight; palm transverse, very slightly convex, microcrenulate and adorned with small setae, palm corner with 2 blunt protrusions and defined by 1 medial and 1 lateral spine; dactylus subequal to palm or barely overriding palmar corner. GNATHOPOD 2 (Fig. 23). Coxa subrectangular, length 2.4 × width; basis elongated, distal third slightly curved, length 6.8× width; ischium length 3× width; carpus about 2× length of propodus, distoventrally with subtriangular scales; propodus chelate, slender, slightly widened distally, length 3× width, and much narrower, about 60% of the carpus width, surface finely setose with distal groups of long pectinate setae, dorsal margin convex, hind margin weakly concave, palm not excavate, with a narrow gap, with a small setal basket on distal third and ending in a tooth-like denticulate projection and a strong subapical seta; dactylus fitting palm, inner margin bearing distally a spiny protuberance fitting to the palm and weakly denticulate projection. PEREOPOD 3 (Fig. 24). Coxa subrectangular, with anterior margin slightly convex, posterior margin slightly concave, ventral margin very slightly convex, length 2.45 × width; posterior margins of ischium-merus with clusters of long setae, rest of pereopod like pereopod 4. PEREOPOD 4 (Fig. 24). Coxa length 1.42 × width, width 0.7× length, anterior margin convex, posterior margin deeply excavate, with wide subtriangular, posterodistal lobe, corner with subquadrate angle, located at distal 63% of the coxa length; ventral margin evenly convex; posterior margins of ischiumcarpus with clusters of long setae; propodus with about 7 short spine groups; dactylus 0.4× length of propodus. PEREOPOD 5 (Fig. 24). Coxa slightly but distinctly posterolobate, posterior lobe irregularly convex, with distal half of posterior margin nearly straight, width 1.14 × length; basis longer (1.2 ×) than wide, slightly narrowing distally, anterior margin nearly straight, with small spines, posterior margin convex, very weakly serrate, posterodistal lobe surpassing distal margin of ischium; merus weakly expanded (width 0.65× length), longer than carpus and bearing anterior and posterior long setae; carpus with anterior marginal setae; propodus narrow, shorter than merus-carpus, with 6–7 anterior marginal short spine groups; dactylus short, 0.36× length of propodus. PEREOPOD 6 (Fig. 24). Basis long, length 1.45 × width, anterior margin nearly straight, with small spines, posterior margin hardly serrate, slightly narrowing distally, posterodistal lobe not reaching distal margin of ischium; merus very weakly expanded (width 0.48 × length) and bearing anterior marginal long setae and few short slender posterior spines; propodus shorter than length of merus-carpus, anterior margin with 7–8 clusters of short spines, dactylus 0.34× length of propodus. PEREOPOD 7 (Fig. 24). Coxa subovate, rounded behind; basis proximal two-thirds subrectangular, anterior margin slightly concave, with small spines, distal third of posterior margin with a straight bevel, with about 9 weak serrations, posterodistal lobe not extending to distal margin of ischium; merus not expanded (narrower than in P6), anterior margins of merus-carpus with short spine groups, posterior margin bearing few short slender spines; propodus shorter than merus-carpus, dactylus broken. UROPOD 1 (Fig. 25). Peduncle about 1.57 × length of outer ramus and 1.73× inner ramus, dorsolateral and dorsomedial margins spinose; inner ramus shorter and more spiniferous than outer ramus; outer ramus medial margin lacking spines. UROPOD 2 (Fig. 25). Peduncle about 1.2× length of outer ramus, dorsolateral and dorsomedial margins each with 4 spines; inner ramus slightly shorter than outer ramus, length 0.92×, with 2 dorsolateral and 6 dorsomedial marginal spines; outer ramus with 7 closely spaced slender spines on dorsolateral margin, dorsomedial margin lacking spines. UROPOD 3 (Fig. 25). Peduncle 0.94 × length of biarticulate outer ramus; second article of outer ramus 0.4× length of article 1; inner ramus barely reaching or very slightly extends past distal end of article 1 of outer ramus, inner margins of rami with long plumose setae and outer margins with a few slender spines. TELSON (Fig. 25). Length subequal to uropod 3 peduncle, 1.5 × longer than wide, cleft (50%), lobes tapering distally with 3–4 submarginal spines and 1 distal spine set in middle of lobe tip. GILLS 5–6 (Fig. 24). With 1 long, tubular accessory lobe on gill 5 and 2 lobes on gill 6, both inserted basally. GILL 7 (Fig. 24). Present, small. BROOD PLATES (Figs 23–24). Present on gnathopod 2 and pereopods 3–5, long, slender and curved distally, largest on gnathopod 2 and pereopods 3–4, smallest on pereopod 5, with long curved brood setae ranging in number from ~ 10–20. STOMODEUM. Extending to the 7 th pereonite. Male (based on: Andres (1983), ANT XXIII-8, station 706 and SAE 3 material) Similar to female, but differing as follows: BODY (Fig. 18). Larger but slightly less robust. LATERAL HEAD LOBE (Fig. 19). Slightly narrower distally, subtriangular, ventral margin less convex. EYE (Figs 18–19). More strongly developed, extending to 66–80% of the head height. ANTENNA 1 (Figs 18–19). Callynophore much stronger, subequal in length to peduncular article 1, flagellum 12–17-articulate, articles broader, calceoli present (callynophore size is related to maturity of male, terminal males have the largest callynophore and greater number of flagellar articles). ANTENNA 2 (Fig. 18). Peduncular articles 4–5 slightly broader; flagellum 15–23-articulate, with calceoli. MANDIBLE. Palp article 3 proportionally longer, length 0.65 × article 2. MAXILLA 1 (Fig. 21). Inner plate, distal projection subacute; palp article 2 strongly widened at distal twothirds, with (according to size) 5–12 non-contiguous, conical apical spines. GNATHOPOD 1. Coxa slightly less widened distally than in female, length 1.34× width, anteroventral corner more narrowly rounded, posterior margin slightly concave; basis, anterior margin with scattered short setae. GNATHOPOD 2 (Fig. 22). Propodus similar to female, except anterodistally narrower and merging smoothly with dactyl insertion on dorsal margin. COXA 4 (Fig. 24). Distinctly narrower than in female, length about 1.76 × width, posterior excavation shallower, posterior lobe smaller with subquadrate angle located at about 60% of the length. PEREOPOD 5. Merus slightly more expanded. UROPOD 2 (Fig. 25). Inner ramus distinctly shorter than outer; outer ramus with 15 lateral marginal spines of differing morphology, distolateral spines stouter, bluntly rounded and more closely spaced than proximal ones, which are thin and acute (number of spines is size related, but males of equal size to females have greater number of spines and always possess the two different types of spines, see p. 24). UROPOD 3 (Fig. 25). Inner ramus slightly longer than peduncle; second article of outer ramus about 0.33–0.5× the length of article 1. UROSOMITE 1 (Figs 18–19). Boss strong, anterodorsal and posterior margins straighter, slightly more pointed and slightly more projecting backward. TELSON. Slightly narrower and longer, length 1.75× width; cleft slightly deeper, about 55–60% of its length. Ontogenic variations Andres (1983) collected a very large male (16 mm) and noticed on maxilla 1 that the width of palp article 2 increases in size as well as the number (as usual) of apical spines (from 5 in the holotype male, 9.5 mm, to 8 in the 13 mm female and 12 in the 16 mm male; see Andres’ 1983: fig. 10). On the maxilliped outer lobe of the 16 mm male, he noted the presence of 4 apical stout spines instead of the usual 2 stout spines, as well as the presence of setae on the inner margin of the dactylus in the palp of larger specimens. As well, he remarked on the stronger development of the gnathopod 2 palm and dac, Published as part of Hendrycks, Ed A. & Broyer, Claude De, 2022, New deep-sea Atlantic and Antarctic species of Abyssorchomene De Broyer, 1984 (Amphipoda, Lysianassoidea, Uristidae) with a redescription of A. abyssorum (Stebbing, 1888), pp. 1-76 in European Journal of Taxonomy 825 on pages 40-53, DOI: 10.5852/ejt.2022.825.1829, http://zenodo.org/record/6686625, {"references":["Andres H. G. 1983. Die Gammaridea (Crustacea: Amphipoda) der Deutschen Antarktis-Expeditionen 1975 / 76 und 1977 / 78. 3. Lysianassidae. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut 80: 183 - 220.","Schellenberg A. 1926. Die Gammariden der Deutschen Sudpolar-Expedition 1901 - 1903. In: von Drygalski E. (ed.) Deutsche Sudpolar-Expedition, 1901 - 1903, im Auftrage des Reichsamtes des Innern. 18 (Zool. 10): 235 - 414.","Nicholls G. E. 1938. Amphipoda Gammaridea. Scientific Reports Australasian Antarctic Expedition 1911 - 14. Series C, Zoology and Botany 2 (4): 1 - 145.","Dahl E. 1954. A collection of Amphipoda from the Ross Sea. Arkiv for Zoologi 7 (19): 281 - 293.","Birstein Y. A. & Vinogradov M. E. 1962. Pelagic Gammaridea (Amphipoda) collected by the Soviet Antarctic Expedition on the M / V \" Ob \" south of 40 ° S. In: Andriashev A. P. & Ushakov P. V. (eds) Biological Reports of the Soviet Antarctic Expedition (1955 - 1958). Vol. 1: 33 - 56. Academy of Sciences of the USSR, Zoological Institute, Moscow.","Arnaud P. M. 1974. Contribution a la bionomie marine benthique des regions antarctiques et subantarctiques. Tethys 6 (3): 467 - 653.","Lowry J. K. & Bullock S. 1976. Catalogue of the marine gammaridean Amphipoda of the Southern Ocean. Bulletin of the Royal Society of New Zealand 16: 1 - 187.","Lowry J. K. 1982. The status of the gammaridean Amphipoda collected by the Australasian Antarctic Expedition 1911 - 1914. Crustaceana 42 (3): 319 - 320. https: // doi. org / 10.1163 / 156854082 X 00425","Wakabara Y., Tararam A. S., Valerio-Berardo M. T. & Ogihara R. M. 1990. Records of Amphipoda collected during I and III Brazilian Antarctic Expeditions. Relatorio interno do Instituto Oceanografi co Universidade de Sao Paulo 30: 1 - 9.","Barnard J. L. & Karaman G. S. 1991. The families and genera of Marine Gammaridean Amphipoda (Except Marine Gammaroids). Records of the Australian Museum. Supplement 13: 1 - 866. https: // doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","De Broyer C. 1983. Recherches sur la Systematique et l'Evolution des Crustaces amphipodes gammarides antarctiques et subantarctiques. PhD thesis, Universite Catholique de Louvain, Louvain-la-Neuve, Belgium.","De Broyer C. & Jazdzewski K. 1993. Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut royal des Sciences naturelles de Belgique 73: 1 - 154.","De Broyer C., Rauschert M. & Scailteur Y. 1999. Structural and ecofunctional biodiversity of the benthic amphipod taxocoenoses. In: Arntz W. E. & Gutt J. (eds) The Expedition ANTARKTIS XV / 3 (EASIZ II) of RV \" Polarstern \" in 1998. Berichte zur Polar- und Meeresforschung 301: 163 - 174.","De Broyer C., Scailteur Y., Chapelle G. & Rauschert M. 2001. Diversity of epibenthic habitats of gammaridean amphipods in the eastern Weddell Sea. Polar Biology 24: 744 - 753. https: // doi. org / 10.1007 / s 003000100276","Havermans C., Nagy Z. T., Sonet G., De Broyer C. & Martin P. 2010. Incongruence between molecular phylogeny and morphological classification in amphipod crustaceans: A case study of Antarctic lysianassoids. Molecular Phylogenetics and Evolution 55: 202 - 209. https: // doi. org / 10.1016 / j. ympev. 2009.10.025","Havermans C., Nagy Z. T., Sonet G., De Broyer C. & Martin P. 2011. DNA barcoding reveals new insights into the diversity of Antarctic species of Orchomene sensu lato (Crustacea: Amphipoda: Lysianassoidea). Deep-Sea Research Part II: Topical Studies in Oceanography 58: 230 - 241. https: // doi. org / 10.1016 / j. dsr 2.2010.09.028","Havermans C. 2012. DNA Barcoding, Phylogeography and Phylogeny of the Lysianassoidea (Crustacea: Amphipoda) from the Southern Ocean and the World's Deep Seas. PhD thesis, Universite Catholique de Louvain, Louvain-la-Neuve, Belgium.","Barnard J. L. & Ingram C. 1990. Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology 499: 1 - 80. https: // doi. org / 10.5479 / si. 00810282.499","d'Udekem d'Acoz C. & Robert H. 2008. Systematic and ecological diversity of amphipods. In: Gutt J. (ed.) The Expedition ANTARKTIS-XXIII / 8 of the Research Vessel \" Polarstern \" in 2006 / 2007. Berichte zur Polar-und Meeresforschung 569: 48 - 56.","Havermans C., Robert H. & d'Udekem d'Acoz C. 2012. Biodiversity and phylogeographic patterns of amphipod crustaceans in Antarctic seas. In: Knust R., Gerdes D. & Mintenbeck K. (eds) The Expedition of the Research Vessel \" Polarstern \" to the Antarctic in 2011 (ANT-XXVII / 3) (CAMBIO). Berichte zur Polar- und Meeresforschung 644: 35 - 39.","d'Udekem d'Acoz C. & Havermans C. 2012. Two new Pseudorchomene species from the Southern Ocean, with phylogenetic remarks on the genus and related species (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae). Zootaxa 3310: 1 - 50. https: // doi. org / 10.11646 / zootaxa. 3310.1.1","Stockton W. L. & DeLaca T. E. 1982. Food falls in the deep sea: occurrence, quality, and significance. Deep Sea Research Part A Oceanographic Research Papers 29: 157 - 169. https: // doi. org / 10.1016 / 0198 - 0149 (82) 90106 - 6","De Broyer C., Nyssen F. & Dauby P. 2004. The crustacean scavenger guild in Antarctic shelf, bathyal and abyssal communities. Deep-Sea Research II: Topical Studies in Oceanography 51: 1733 - 1752. https: // doi. org / 10.1016 / j. dsr 2.2004.06.032","De Broyer C., Danis B. & Heterier V. 2006. Biodiversity, phylogeny and trophodynamics of amphipod crustaceans of the Antarctic deep sea. In: Fahrbach E. (ed.) The Expedition ANTARKTIS-XXI / 3 of the Research Vessel \" Polarstern \" in 2005. Berichte zur Polar- und Meeresforschung 533: 135 - 141.","De Broyer C., Lowry J. K., Jazdzewski K. & Robert H. 2007. Catalogue of the Gammaridean and Corophiidean Amphipoda (Crustacea) of the Southern Ocean with distribution and ecological data. In: De Broyer C. (ed.) Census of Antarctic Marine Life: Synopsis of the Amphipoda of the Southern Ocean. Bulletin de l'Institut royal des Sciences naturelles de Belgique, Biologie - Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen Biologie 77 (Supplement 1): 1 - 325.","Barnard K. H. 1932. Amphipoda. Discovery Reports 5: 1 - 326. https: // doi. org / 10.5962 / bhl. part. 27664","Duffy G. A., Horton T., Sheader M. & Thurston M. H. 2013. Population structure of Abyssorchomene abyssorum (Stebbing, 1888) (Amphipoda: Lysianassoidea), a scavenging amphipod from the Mid-Atlantic Ridge in the vicinity of the Charlie-Gibbs Fracture Zone. Deep-Sea Research Part II: Topical Studies in Oceanography 98: 360 - 369. https: // doi. org / 10.1016 / j. dsr 2.2013.02.004"]}

During the Census of Marine Life Polarstern ANDEEP I-III and Meteor M79/1 DIVA-3 expeditions, autonomous baited trap systems were employed to sample the mobile, necrophagous amphipods from abyssal depths. Within DIVA-3 (July 10–August 26 2009), a free-fall baited trap was used successfully at three stations in the southwest Atlantic, once in the Argentine Basin and twice in the Brazilian Basin. A total of twenty-one stations were sampled by baited traps during the ANDEEP I-III (2002, 2005) cruises in the Southern Ocean. Trap sets recovered large numbers of scavenging lysianassoid and alicelloid amphipods, including specimens of the widespread and commonly considered cosmopolitan uristid species Abyssorchomene abyssorum (Stebbing, 1888). During examinations of these and other North Atlantic collections of A. abyssorum, two similar new species A. patriciae sp. nov. and A. shannonae sp. nov. were discovered. Important morphological characters which differentiate the two new species from their congeners are found in the shape of the head lobe, coxa 1, gnathopod 2, coxa 5, pereopod 7 basis and uropod 3 rami length. The new species are fully figured and an identification key is provided. Abyssorchomene abyssorum is redescribed and for the first time, the female is fully described and illustrated from new material. The Southern Ocean endemic A. scotianensis (Andres, 1983) is also described and illustrated from new collections to complement the original description.

Mouthparts: Tmetonyx cicada Epistome and upper lip The epistome is produced, widely conical with a rounded apex and lacks any spines or setae (Figure 1 (d)). The epistome and the upper lip are separate. Posterolaterally on the oral surface of the epistome is a pair of small depressions (ed, Figure 1 (d)) that receive the articulating knobs of the mandibles. Mandibles The hinge line of the mandible is only slightly diagonal (almost transverse) and is located at the posterior end of the mandible (hl, Figure 2 (f)). In the resting position, the palps are held anteriorly below the antennae, with article 3 directed laterally (Figure 5 (g)). Palpal article 2 is slender and about 4 times as long as article 1 (Figure 2 (g)). The mandibles are asymmetrical in the morphology of the incisor, setal row and lacinia mobilis. The large, triangular molar processes (mo, Figure 2 (f)) are oriented obliquely to the mandibular body in the posteromedial direction and have narrow, slightly convex triturating surfaces (ts, Figure 2 (g)) with ca. 50 transverse ridges carrying densely packed columnar teeth (Figure 2 (k)). The triturating surface also bears three crater-like structures (arrowheads, Figure 2 (k)) arranged equidistant along the midline of the surface. The setal row (sr, Figure 2 (g)) extends from the incisor to the molar process along the medial margin of the mandible and then continues along the medial side of the molar process and the aboral side of the triturating surface (Figure 2 (k)). The three apical setae (ar, Figure 2 (h)) on each mandible are very large and spine-like, with curved, hooklike tips. In mandibular adduction, these setae on one mandible fit into the gaps between those on the other mandible. The remaining setae of the setal row are thin and hairlike, they have about the same size throughout the length of the row and are especially densely spaced along the distal side of the molar, where they form a thick brushlike coat. In the resting position, the triturating surfaces of the molar processes and the spine rows of the opposite mandibles are tightly pressed against each other (Figure 2 (f)). A low ridge (mmr, Figure 2 (g)) carrying a row of simple setae extends along the middle of the oral side of the molar process from the edge of the triturating surface to the base of the molar. The whole oral surface of the molar process is pubescent, with denser pubescence on the proximal side of the molar ridge. The left incisor (Figure 2 (f,j)) has a wide and straight cutting edge and bears a single small tooth at its ventral end. The cutting edge of the right incisor (in, Figure 2 (g,h)) is shorter, curved, and in some specimens is armed ventrally with two small teeth (Figure 2 (h)). The cutting edges of the incisors are oriented in a diagonal plane; in the adducted position, the left incisor overlaps the right incisor anteriorly. Midway between the incisor and the palp is a small, rounded articulating knob that fits into the corresponding depression on the oral side of the upper lip (see above). The lacinia mobilis is present only on the left mandible and has been reduced to a small, curved peg (arrowhead, Figure 2 (i)). Paragnaths A pair of paragnaths (Figure 1 (f)) bound the mouth posteriorly; in the resting position, the mandibular bodies are closely pressed against their lateral sides and the paragnaths cover completely their molar processes. The left paragnath is slightly larger than the right and the distal tip of the right paragnath lies below the tip of the left paragnath. The paragnaths are slightly longer than wide and are fused only at their bases. Proximolateral surfaces on the oral side of each paragnath are finely pubescent. These fields of pubescence are bordered medially by an arch-shaped longitudinal row of longer simple setae (as, Figure 1 (f)). Lateral to this setal row at the distal end of each paragnaths is a small knoll (pk, Figure 1 (f)) that fits into the depression on the mandible posterior to the incisor. A small, conical spine (sp, Figure 1 (f)) with a pointed tip projects from the medial face of each paragnath, about one-third of their length from the distal tips. The posterior face of each paragnath forms a posteriorly directed lateral lappet with a rounded tip (lp, Figure 1 (f)). Maxillulae The maxillulae lie in a horizontal plane (ml, Figure 5 (g)) and are closely pressed against the paragnaths and mandibles. A short, triangular coxa is attached to the cephalothorax with a wide articulating membrane (mmp, Figure 5 (g)). The inner plate (ml ip, Figure 3 (e,f)) is small, cylindrical, about twice as short as the outer plate. Its blunt apical tip bears two large flexible pappose setae with curved tips (pi, Figure 3 (e,f)). The basipod extends widely from the coxa and has an additional medial joint with the inner plate. The outer plate (ml op, Figure 3 (e,f)) is wide and leaf-shaped. In the distal portion of the plate, there are two rows of large slender spine teeth with a 7/4 crown arrangement diagnostic for the Uristidae (Figure 3 (e,h)): 7 teeth (st1���7) in an apical row (st1 1���2-cuspidate, st2 1���3-cuspidate, st3 2-cuspidate, st4 3-cuspidate, st5 3���4-cuspidate, st6 5-cuspidate, st7 4���6-cuspidate) and 4 teeth (stA-D) in a subapical row (stA 2-cuspidate, stB 3���4-cuspidate, stC and stD 3-cuspidate). The distal portion of the outer plate also has two longitudinal bands of simple setae (bo, Figure 3 (e,f,h)) located along the medial margin and on the oral surface of the plate. The palp (ml pl, Figure 3 (e���g)) is 2-articulate and lacks setation; article 1 is triangular, about as long as wide; article 2 is long and curved towards the midline. Wide distal ends of both palps are armed with eight short spine-like setae (smp, Figure 3 (g)) and with two flexible sensory setae (arrows, Figure 3 (g)) located between spines 6 and 7 and dorsally to the last eighth spine (counting spines ventral to dorsal). In the resting position, the opposite palps meet at the midline behind the outer plates of the maxillipeds, with the left palm slightly overlapping the right one anteriorly (Figure 3 (e,g)). Maxillae The left and right maxillae are roughly equal in size and shape (Figure 4 (e)). Small, triangular coxae (mx cx, Figure 4 (e)) arise from a common extension of the sternum. The surface of the coxa lacks setation. The basipod and both inner and outer plates extend from the coxa anteriorly in a horizontal plane (mx, Figure 5 (g)) partly concealing the larger maxillulae from below. The anteromedially oriented basipod is basally wide (Figure 4 (e)), then tapers apically and curves to form an anteriorly oriented inner plate (mx ip, Figure 4 (e,f)). The inner plate carries three closely spaced parallel rows of flexible setae along the medial margin (Figure 4 (f,h)). The setae in the outer (ri3, Figure 4 (h)) and inner (ri1, Figure 4 (h)) rows are about twice as wide and long as those in the middle row (ri2, Figure 4 (h)). The setae in the outer row are unilaterally serrated in the distal half (Figure 4 (h)); the remaining setae are simple. On the aboral surface of the inner plate near the setal row is a small field of sparsely spaced simple setae (fi, Figure 4 (f)). The outer plate (mx op, Figure 4 (e,f)) is lancet-shaped and carries distally small simple setae on the oral surface and two rows of flexible setae along the medial margin (Figure 4 (g)): the setae in the outer row (ro2, Figure 4 (g)) are wide and unilaterally serrated in the distal half, those in the inner row (ro1, Figure 4 (g)) are thin and simple. Maxillipeds Maxillipeds consist of a fused coxa (mp cx, Figure 5 (g,h)), basipods (mp bs, Figure 5 (g,h)) with endites (inner plates), ischia (mp is, Figure 5 (g���i)) with endites (outer plates) and palps. The coxa is oriented in the vertical plane (mp cx, Figure 5 (g)), but near its distal tip it curves forward so that the remaining maxilliped articles lie in the horizontal plane covering completely the other mouthparts. The basipods touch across the midline but do not fuse (Figure 5 (h)). An array of long, simple setae extends along the medial and distal margins on the aboral surface of basipods and there are tufts of simple setae at the distolateral corners of the basipods and ischia (Figure 5 (h)). The inner plates (mp ip, Figure 5 (i,j)) gradually widen from the base to the apex; their anterior margins are obliquely bevelled. In the resting position, the opposite plates meet each other in the middle (Figure 5 (i,j)). The medial portion of the anterior margin of each inner plate is extended into a triangular process that bears three nodular spines (ns, Figure 5 (k)). The anterior and medial margins on the oral surface of the plates carry a row of large setae; the medial of these setae are pappose (psi, Figure 5 (j)) and those at the anterior margin lack setules (ssi, Figure 5 (j)). The rest of the oral surface of the plates is evenly covered with thin simple setae. The outer plates (mp op, Figure 5 (g���i)) are about twice as large as the inner plates and have straight medial and arcuate lateral margins. The medial and distal margins of the outer plates are armed with small subquadrate teeth and covered with a row of simple setae on their aboral surfaces (Figure 5 (l)); the remaining surface of the plates lacks setation. Numerous small irregularly spaced pores (Figure 5 (l)) are located on the oral surfaces of the outer plates along their medial margins. The palps are 4-articulate (Figure 5 (g���i)); their articles 1 and 2 are flattened and wide (but less so than in A. nugax) and cover the maxillae laterally. The medial margins of all palpal articles bear a row of long simple setae. In the resting position, the palps do not cross or meet at the midline, but the right palp lies slightly anterior to the left palp (Figure 5 (h))., Published as part of Soldatenko, Elena V., 2021, Morphology of the mouthparts and digestive system in two species of Uristidae Hurley, 1963 (Amphipoda: Lysianassoidea), pp. 471-494 in Journal of Natural History 55 (7 - 8) on pages 480-482, DOI: 10.1080/00222933.2021.1906458, http://zenodo.org/record/5475568

Soldatenko, Elena V. (2021): Morphology of the mouthparts and digestive system in two species of Uristidae Hurley, 1963 (Amphipoda: Lysianassoidea). Journal of Natural History 55 (7-8): 471-494, DOI: 10.1080/00222933.2021.1906458, URL: http://dx.doi.org/10.1080/00222933.2021.1906458

Mouthparts: Anonyx nugax Epistome and upper lip The epistome (Figure 1 (a,b)) is produced, conical, subacute and lacks any spines or setae on the aboral surface, but is evenly covered with simple setae on the oral surface. The ventral margin of the epistome bears a rounded medial projection (pe, Figure 1 (a,b)) that in the resting position fits between the mandibular incisors. The epistome and the upper lip are separate. Posterolaterally on the oral surface of the epistome is a pair of deep depressions (ed, Figure 1 (a,b)) that receive the articulating knobs of the mandibles. Mandibles The hinge line of the mandible is slightly oblique and is located at the posterior end of the mandible (hl, Figure 2 (a)). In the resting position, the palps are held upward so that they lie between the antennae (md pl, Figure 5 (a)), with article 3 directed anteriorly. The mandibles are asymmetrical in the morphology of the incisor, setal row and lacinia mobilis. The molar process (mo, Figure 2 (a���d)) is large, roughly rectangular and is oriented obliquely to the mandibular body in the posteromedial direction. In the resting position, the tips of the opposite molar processes do not meet at the midline lying a short distance apart (Figure 2 (a)). The tip of each molar process is slightly rounded; it is densely pubescent and lacks a triturating surface (Figure 2 (d)). The setal row is located on the oral side of the mandible near its medial margin and is oriented perpendicular to the blade of the incisor. It starts about 100���150 ��m from the incisor (Figure 2 (b,c)) and reaches the basal portion of the molar process (sr, Figure 2 (d)). The three apical setae (near the incisor) on each mandible are very large and spine-like (ar, Figure 2 (a���c)); the remaining setae are much thinner and hairlike. Since the setal row is located some distance from the medial margin of the mandible, in the resting position the setae of the opposite mandibles are kept widely apart (Figure 2 (a)), but it is clear that in mandibular adduction the three apical setae of one mandible interdigitate with the corresponding setae on the other mandible. The blades of the incisors are oriented in a nearly vertical plane; in the adducted position the left incisor overlaps the right incisor anteriorly (Figure 2 (a)). Both incisors have a wide and straight cutting edge (Figure 2 (a���c,e)), but the edge of the left incisor is slightly longer (Figure 2 (a)). The medial ends of both incisors bear long conical teeth (Figure 2 (a)), with two teeth located on the left (ti, Figure 2 (b)) and one on the right mandible (ti, Figure 2 (c)). The teeth are arranged such that in mandibular adduction the right tooth fits into the gap between the left teeth. Midway between the incisor and the palp is a large, conical articulating knob (mk, Figure 2 (b)) that fits into the corresponding depression on the oral side of the upper lip (see above). The lacinia mobilis (arrow, Figure 2 (b); lm, 2(e)) is present only on the left mandible and has been reduced to a small, curved peg (Figure 2 (e)). The palp is 3-articulate and located opposite the molar; its article 2 is slender and about 3 times as long as article 1. Paragnaths A pair of paragnaths (Figure 1 (c)) bound the mouth posteriorly; in the resting position the mandibular bodies are closely pressed against their lateral sides and the paragnaths cover completely their molar processes. The paragnaths are symmetrical, only slightly longer than wide and are fused only at their bases. Both oral and aboral surfaces of the paragnaths are densely pubescent, except their lateral margins, which lack setae. On the oral surface of each paragnath there is a depression (pd, Figure 1 (c)) into which the molar processes of the mandibles fit. The aboral face of each paragnath forms a posteriorly directed lateral lappet with a pointed tip (lp, Figure 1 (c)). Maxillulae The maxillulae lie in a horizontal plane (ml, Figure 5 (a)) and are closely pressed against the paragnaths and mandibles. A short triangular coxa is attached to the cephalothorax with a wide articulating membrane (mmp, Figure 5 (a)). The inner plate (ml ip, Figure 3 (a,b)) is about twice as short as the outer plate; it has an elongated narrow basis and an expanded club-shaped distal portion. The inner plate carries apically two large pappose setae with long needle-like setules (pi, Figure 3 (a,b,d)). The basipod extends narrowly from the coxa and is articulated medially with the inner plate by a cuticular membrane and a triangular knob. The outer plate (ml op, Figure 3 (a,b,d)) is wide, almost cylindrical in shape. In the distal portion of the plate, there are two rows of large slender spine teeth with a 7/4 crown arrangement diagnostic for the Uristidae (Figure 3 (a���c)): 7 teeth (st1���7) in an apical row (st1���4 one-cuspidate, st5���6 two-cuspidate, st7 three-cuspidate) and 4 teeth (stA-D) in a subapical row (stA one-cuspidate, stB three-cuspidate, stC one-cuspidate, stD threecuspidate). The outer plate also bears a U-shaped band of simple setae (bo, Figure 3 (b���d)); the two arms of this band extend along the medial margin and oral surface of the plate and are linked just proximal to st7. The palp (ml pl, Figures 3 (a���c), 4(a) and 5(a)) is 2-articulate; article 1 is triangular, about as long as wide, article 2 is long and curved towards the midline. The surface of the palp lacks setae, except a small setal field on the oral side. Wide distal ends of both palps are armed with 8 short spine-like setae (smp, Figure 3 (c)). In the resting position, the opposite palps meet at the midline behind the outer plates of the maxillipeds, with the left palp overlapping the right one anteriorly (Figure 3 (a)). Maxillae The left and right maxillae are roughly equal in size and shape (Figure 4 (a)). Small, triangular coxae (mx cx, Figure 4 (a)) arise from a common extension of the sternum. The surface of the coxa lacks setation. The basipod and both inner and outer plates extend from the coxa anteriorly in a horizontal plane (mx, Figure 5 (a)) partly concealing the large maxillulae from below (Figure 4 (a)). The anteromedially oriented basipod is basally wide (Figure 4 (a)), then tapers apically and curves to form an anteriorly oriented lancet-shaped inner plate (mx ip, Figure 4 (a,b)). The inner plate carries three closely parallel rows of simple setae along the medial margin (Figure 4 (b,d)): the setae in the inner (ri1, Figure 4 (d)) and outer (ri3, Figure 4 (d)) rows are spine-like and much wider and longer than those in the middle row (ri2, Figure 4 (d)). The setae progressively increase in size towards the apex, but the most proximal seta in the inner row (arrow, Figure 4 (b,d)) is markedly larger than the others. A U-shaped field of thin simple setae encloses the three setal rows on either side and proximally (bi, Figure 4 (b,d)). The outer plate (mx op, Figure 4 (a,b)) is lancet-shaped and carries distally a small field of simple setae on the oral surface and two rows of simple setae along the medial margin (Figure 4 (c)): the setae in the outer row (ro2, Figure 4 (c)) are much wider and almost twice as long as those in the inner row (ro1, Figure 4 (c)). Maxillipeds Maxillipeds consist of a fused coxa (mp cx, Figure 5 (a���c)), basipods (mp bs, Figure 5 (a���c)) with endites (inner plates), ischia (mp is, Figure 5 (a���c)) with endites (outer plates) and palps. The coxa is oriented in the vertical plane (mp cx, Figure 5 (a)), but near its distal tip it curves forward so that the remaining maxilliped articles lie in the horizontal plane covering completely the other mouthparts. The basipods touch across the midline but do not fuse (Figure 5 (b)). A few long simple setae are located along the distal and medial margins on the aboral surface of basipods and the distolateral corners of the basipods and ischia; a row of simple setae extends across the aboral surface of the ischia and continues along the medial margin of all palpal articles (Figure 5 (b,c)). The inner plates (Figure 5 (e)) are very small, subrectangular; in the resting position, the opposite plates do not touch across the midline. Each plate bears apically three large pappose setae (ppi, Figure 5 (e)) that project from a deep longitudinal notch on the oral surface of the plate. Lateral to these setae on the apical tip of the plate is a pair of larger and another pair of smaller cuspidate setae (cpi, Figure 5 (e,f)). The outer plates (mp op, Figure 5 (a���d)) are large, lancet-shaped, about twice as long as the inner plates, finely serrated along the medial and anterior margins (Figure 5 (d)) and lack setation except for a row of small reduced setae along the medial margin (Figure 5 (d)). The palps are 4-articulate (Figure 5 (a���c)); their articles 1 and 2 are wide, flattened and cover the maxillae laterally. In the resting position, the palps cross each other at the midline (Figure 5 (b))., Published as part of Soldatenko, Elena V., 2021, Morphology of the mouthparts and digestive system in two species of Uristidae Hurley, 1963 (Amphipoda: Lysianassoidea), pp. 471-494 in Journal of Natural History 55 (7 - 8) on pages 474-480, DOI: 10.1080/00222933.2021.1906458, http://zenodo.org/record/5475568

Onisimus turgidus (Sars, 1879) Figs 4–10 Anonyx turgidus Sars, 1879: no 13. Onisimus turgidus – Sars, 1885: 147, pl. xii, fig. 5, comb. nov. (described as sp. nov.). — Lowry & Stoddart 1993: 169. — Johnsen 2001: 60, fig. 21. — Zimina et al. 2019: 871. Onisimus normani – Stephensen 1923: 48. — Shoemaker 1930: 11. — Vader 1975: 38. — Moore et al. 1994: 206. — Vader & Krapp-Schickel 1996: 65. — Bryazgin 1997: 99. — Lyubina et al. 2014: 246. (These are all not O. normani, but O. turgidus.) Material examined NORWAY • 1 ♀, syntype (15 mm); Barents Sea; 72°53′ N, 21°51′ E; 408 m depth; 30 Jul. 1878; G.O. Sars leg.; stn 323 (trawl), Norwegian North sea Expedition; 1.5°C; silt.; F1764 (Figs 4–6) • 1 ♀ (10 mm); Kuberget Ullsfjorden; 100 m depth; Sep. 1974; Wim Vader leg.; from Actinostola callosa; TSZCr8573. (Figs 7–10) • 1 spec.; Ullsfjorden; from Actinostola callosa; TM IX-95 • 2 specs; Ullsfjorden; 69°39′48″ N, 19°45′18″ E; 106 m depth; 28 Apr. 1995; Wim Vader leg.; from Actinostola callosa; stn JohanRuud 255-95; TSZCr14488 • 21 specs; Ullsfjorden; Jun. 1995; Wim Vader leg.; from Actinostola callosa; stn Hyas 6-95; Arctic University Museum of Tromsø • 1 spec., Finnkroken; 50– 60 fathoms depth; 1900; J. Sparre Schneider leg.; TSZCr1171. Distribution Johnsen (2001) studied samples of presumed Onisimus normani from different parts of the world, and concluded that they all (except the ones from S Norway) belonged in the turgidus species complex; unfortunately there was not sufficient material available to be able to revise this entire complex. The type material was collected from the Barents Sea and it has been collected from this area several times since (Bryazgin 1997; Lyubina et al. 2014, sub nomine O. normani; Zimina et al. 2019). Material from N Norway (Ullsfjorden) is quite similar to the type material, but the animals are smaller, 10 mm against 14 mm for the type. No fully adult or ovigerous specimens of O. turgidus have been found as yet, similar to the situation in O. normani. Onisimus turgidus also spends most of its life inside a sea anemone and like O. normani, likely leaves the host when almost adult. Biology Onisimus turgidus appears to be an obligate associate of sea anemones for most of its life-cycle. The preferred host of Onisimus turgidus in N Norway is Actinostola callosa. The numbers vary quite a lot from year to year (Moore et al. 1994; Vader & Krapp-Schickel 1996: table 2, sub nom. O. normani) but the species is never numerous even there: in 714 specimens of Actinostola Verrill, 1883 from Ullsfjorden 116 specimens of O. turgidus were found, an infection percentage of 0.16 amphipods per host. There is a significant positive correlation between the size of the Actinostola hosts and the number of Onisimus found inside: in the large sample of January 1974 sea anemones of 10–50 g wet weight contained 0.03 amphipods per host, those of 60–100 g 0.54 and the few of 100–150 g 3.00. Actinostola callosa in Ullsfjorden also is the host of another amphipod species, Stenothoe brevicornis Sars, 1883, that likewise feeds on host tissue, but this amphipod lives on the outside of the host, among the tentacles (Moore et al. 1994; Vader & Krapp-Schickel 1996). Onisimus turgidus in Ullsfjorden is also sometimes found inside Bolocera tuediae, the almost exclusive host of O. normani in S Norway (Vader 1973), but here it is even less common than in A. callosa: in 297 specimens of Bolocera Gosse, 1860 from Ullsfjorden only 14 specimens of Onisimus were found (0.05 amphipods per host). The parasitic isopod Parapodascon sp. that is quite common on O. normani in S Norway, has also been found a few times on O. turgidus from the Ullsfjord., Published as part of Vader, Wim, Johnsen, Jan Roger & Tandberg, Anne Helene S., 2020, Onisimus turgidus (Sars, 1879) (Amphipoda, Uristidae), an overlooked amphipod from sea anemones in Northern Norway, pp. 34-50 in European Journal of Taxonomy 724 on pages 40-48, DOI: 10.5852/ejt.2020.724.1155, http://zenodo.org/record/5627470, {"references":["Sars G. O. 1879. Crustacea et Pycnogonida nova in itinere 2 do et 3 tio expeditionis norvegicae anno 1877 & 78 collecta (Prodromus descriptionis). Archiv for Mathematik og Naturvidenskaber 4: 427 - 476.","Sars G. O. 1885. Crustacea I. Norwegian North Atlantic Expedition 1876 - 1878 6 (14): 1 - 280. https: // doi. org / 10.5962 / bhl. title. 2168","Lowry J. K. & Stoddart H. E. 1993. The Onisimus - problem (Amphipoda, Lysianassoidea, Uristidae). Zoologica Scripta 22: 167 - 181. https: // doi. org / 10.1111 / j. 1463 - 6409.1993. tb 00349. x","Johnsen J. R. 2001. The taxonomy of Onisimus. MSc thesis, University of TromsO, Norway.","Zimina O. L., Strelkova N. A. & Lyubina O. S. 2019. Species composition and peculiarities of the distribution of benthic Peracarida (Crustacea, Malacostraca) in the Barents Sea, based on surveys 2003 - 2008. Biology Bulletin (Zoologichesky Zhurnal) 46: 864 - 885. https: // doi. org / 10.1134 / S 1062359019080181","Stephensen K. 1923. Crustacea Malacostraca. V (Amphipoda I). The Danish Ingolf Expedition 3 (8): 1 - 100.","Shoemaker C. R. 1930. The lysianassid amphipod crustaceans of Newfoundland, Nova Scotia, and New Brunswick in the United States National Museum. Proceedings of the United States National Museum 77: 1 - 19. https: // doi. org / 10.5479 / si. 00963801.77 - 2827.1","Vader W. 1975. The sea anemone, Bolocera tuediae, and its copepod parasite, Antheacheres duebeni, in northern Norway. Astarte 8: 37 - 39.","Moore P. G., Rainbow P. S. & Vader W. 1994. On the feeding and comparative biology of iron in coelenterate-associated gammaridean Amphipoda (Crustacea) from N. Norway. Journal of Experimental Marine Biology and Ecology 178: 205 - 231. https: // doi. org / 10.1016 / 0022 - 0981 (94) 90037 - X","Vader W. & Krapp-Schickel G. 1996. Redescription and biology of Stenothoe brevicornis Sars (Amphipoda: Crustacea), an obligate associate of the sea anemone Actinostola callosa (Verrill). Journal of Natural History 30: 51 - 66. https: // doi. org / 10.1080 / 00222939600770041","Bryazgin V. 1997. Diversity, distribution and ecology of benthic amphipods (Amphipoda, Gammaridea) in the Barents Sea sublittoral. Polish Polar Research 18: 89 - 106.","Lyubina O. S., Bryazgin V. F. & Raznovskaya S. V. 2014. The composition and distribution of benthic amphipods (Crustacea: Amphipoda) in the southern Barents Sea. Russian Journal of Marine Biology 40: 241 - 254. https: // doi. org / 10.1134 / S 1063074014040063","Vader W. & Lonning S. 1973. Physiological adaptations in associated amphipods. A comparative study of tolerance to sea anemones in four species of Lysianassidae. Sarsia 53: 29 - 40. https: // doi. org / 10.1080 / 00364827.1973.10411245"]}

Onisimus normani Sars, 1891 Figs 1–3 Onesimus normani (Schneider ms) Sars, 1891: figs on pl. 36–2. Onesimus normani – Sars, 1895: 105. Onisimus normani – Stephensen 1923: 48; 1935: 38. — Vader 1967: 286, figs 2–3; 1975: 38; 1983: 144. — Vader & Lønning 1973: 29. — Lowry & Stoddart 1993: 169. — Johnsen 2001: 49, fig. 17. non O. normani – Stephensen 1923: 48. — Shoemaker 1930: 11. — Vader 1975: 38. – Moore et al. 1994: 206. — Vader & Krapp-Schickel 1995: 65. — Bryazgin 1997: 99. — Lyubina et al. 2014: 246. (All these references = O. turgidus (Sars, 1879).) Material examined NORWAY • 1 ♀ (10 mm); Korsfjorden; 680 m depth; 1968; Wim Vader leg.; from Bolocera tuediae; TSZCr8659 (Figs 1–3) • 1 ♀ immature (8 mm); same collection data as for preceding; TSZCr8659 • 1 spec.; Raunefjorden; 240 m depth; 1968; Wim Vader leg.; from Bolocera tuediae; TSZCr8628 • 1 spec.; Korsfjorden; 680 m depth; 1968; Wim Vader leg.; from Bolocera tuediae; TSZCr8623 • 1 spec.; same collection data as for preceding; TSZCr8624 • 2 specs; same collection data as for preceding; TSZCr9320 • 7 specs; Andfjorden; 69°18′42″ N, 16°23′24″ E; 498 m depth; 1 Jul. 1997; Wim Vader leg.; from Bolocera tuediae; TSZCr12962 Distribution Although there are many records of O. normani in the amphipod literature, all except those from Southern Norway in reality are either O. turgidus or taxa very closely related to that species (Johnsen 2001). Johnsen mentions a record from Andsfjorden at 69° N (material in Tromsø Museum): otherwise this species has only been recorded from the Oslofjord and a number of localities in W Norway (Vader 1967). Onisimus normani appears to be an obligate associate of the sea anemone Bolocera tuediae, and it has only exceptionally been found in other sea anemones (Vader 1967, 1975), although it is well able to survive also in other sea anemone hosts in the laboratory (Vader & Lønning 1973)., Published as part of Vader, Wim, Johnsen, Jan Roger & Tandberg, Anne Helene S., 2020, Onisimus turgidus (Sars, 1879) (Amphipoda, Uristidae), an overlooked amphipod from sea anemones in Northern Norway, pp. 34-50 in European Journal of Taxonomy 724 on pages 36-40, DOI: 10.5852/ejt.2020.724.1155, http://zenodo.org/record/5627470, {"references":["Stephensen K. 1923. Crustacea Malacostraca. V (Amphipoda I). The Danish Ingolf Expedition 3 (8): 1 - 100.","Stephensen K. 1935. The Amphipoda of N. Norway and Spitsbergen with adjacent waters. TromsO Museums Skrifter 3: 1 - 140.","Vader W. 1967. Notes on Norwegian marine amphipods 1 - 3. Sarsia 29: 283 - 294. https: // doi. org / 10.1080 / 00364827.1967.10411089","Vader W. & Lonning S. 1973. Physiological adaptations in associated amphipods. A comparative study of tolerance to sea anemones in four species of Lysianassidae. Sarsia 53: 29 - 40. https: // doi. org / 10.1080 / 00364827.1973.10411245","Lowry J. K. & Stoddart H. E. 1993. The Onisimus - problem (Amphipoda, Lysianassoidea, Uristidae). Zoologica Scripta 22: 167 - 181. https: // doi. org / 10.1111 / j. 1463 - 6409.1993. tb 00349. x","Johnsen J. R. 2001. The taxonomy of Onisimus. MSc thesis, University of TromsO, Norway.","Shoemaker C. R. 1930. The lysianassid amphipod crustaceans of Newfoundland, Nova Scotia, and New Brunswick in the United States National Museum. Proceedings of the United States National Museum 77: 1 - 19. https: // doi. org / 10.5479 / si. 00963801.77 - 2827.1","Vader W. 1975. The sea anemone, Bolocera tuediae, and its copepod parasite, Antheacheres duebeni, in northern Norway. Astarte 8: 37 - 39.","Moore P. G., Rainbow P. S. & Vader W. 1994. On the feeding and comparative biology of iron in coelenterate-associated gammaridean Amphipoda (Crustacea) from N. Norway. Journal of Experimental Marine Biology and Ecology 178: 205 - 231. https: // doi. org / 10.1016 / 0022 - 0981 (94) 90037 - X","Bryazgin V. 1997. Diversity, distribution and ecology of benthic amphipods (Amphipoda, Gammaridea) in the Barents Sea sublittoral. Polish Polar Research 18: 89 - 106.","Lyubina O. S., Bryazgin V. F. & Raznovskaya S. V. 2014. The composition and distribution of benthic amphipods (Crustacea: Amphipoda) in the southern Barents Sea. Russian Journal of Marine Biology 40: 241 - 254. https: // doi. org / 10.1134 / S 1063074014040063","Sars G. O. 1879. Crustacea et Pycnogonida nova in itinere 2 do et 3 tio expeditionis norvegicae anno 1877 & 78 collecta (Prodromus descriptionis). Archiv for Mathematik og Naturvidenskaber 4: 427 - 476.","Sars G. O. 1890 - 1895. An Account of the Crustacea of Norway, with short Descriptions and Figures of all the Species. Vol. 1. Amphipoda. Alb. Cammermeyers Forlag, Christiania and Copenhagen. https: // doi. org / 10.5962 / bhl. title. 1164"]}

The uristid lysianassoids are reported for the first time from Korean waters with a redescription of Anonyxabei Takekawa & Ishimaru, 2001 and the description of Anonyxexilipessp. n.Anonyxabei is characterized by a distinctively small projection of the posterodistal corner on epimeron 3, different from all species of the Anonyxnugax group which share a constriction at the point of insertion of a distal seta on the inner ramus of uropod 2. Anonyxexilipessp. n. is included in the Anonyxlaticoxae group characterized by the unconstricted inner ramus of uropod 2. This new species is distinguished from other A.laticoxae group species by the longer and more slender carpus and propodus of pereopod 6, and the non-lobate merus of pereopod 7.

Two Norwegian uristid amphipods, obligate associates of sea anemones, have for a long time been confused sub nomine Onisimus normani Sars, 1890. In reality this species only occurs in south Norway, while the north-Norwegian material belongs to O. turgidus (Sars, 1879), described from the Barents Sea and for a long time forgotten. This paper fully illustrates both species, gives a key, and provides data on their distribution and ecology.

Stephonyx transversus sp. nov. (Figures 1���5) Material examined. Holotype: adult female, 33.8 mm, Sergipe state, Brazil (12��01'49''S 37��24'61''W), 720 m depth (MOUFPE 15324). Type-locality. Sergipe state, Brazil (12��01'49''S ���37��24'61''W), 720 m depth. Etymology. Specific epithet corresponding to the transverse angle formed by the anterior margin and the palm of the propodus of gnathopod 2. Diagnosis. Gnathopod 2, palm transverse. Maxilla 2, inner plate rounded, with one stout plumose subterminal seta and other smaller. Epimeral plate 3, posteroventral corner without spine. Telson 80% cleft, apical margin truncate. Description. (Based on holotype) Head (Figure 1A), deeper than long, anterodorsal and anteroventral corner rounded, anterior margin concave medially; eyes (faded in alcohol), S inverted-shaped; ommatidia are not well defined. Antenna 1, almost half the size of antenna 2, article 1 twice the size of the article 2, dorsal margin slightly concave, article 3 short, half of the size of the second article; primary flagellum 26-articulate, article 1 with two well-developed fields of callynophores; accessory flagellum with two articles, the first is �� of the article 1 of primary flagellum, article 2 is �� of the article 1 of primary flagellum. Antenna 2, almost reaches the half of the body; flagellum 53-articulate. Mouthpart: subquadrate bundle. Epistome and upper lip (Figure 2D) subtly separated; upper lip, anteroventral margin forming a setose acute angle. Mandible (Figure 2B and E) incisor smooth; lacinia mobilis simple, robust in both, 7 accessories setae; molar setose not triturative; palp 3-articulate, article 1, short, 1/3 of second article, article 2 and article 3, anterior margin with long and simple setae (article 2 up to half the margin with setae). Maxilla 1 (Figure 3C) inner plate rounded, small, about half the size of the outer plate; one stout subterminal seta and five smaller plumose setae,; outer plate, broad; setal-teeth with 7/4 crown arrangement: ST1, subconical, 3-cuspidate, ST2, subquadrate, short, half of the size of ST1, with two cusps, ST3 2-cuspidate, ST4 3-cuspidate, ST5-7 multicuspidate; STA at STD stout and multicuspidate; palp 2-articulate, article 1, subquadrate, about �� of the size of article 2, article 2, dorsal margin lightly geniculate; apical margin with 10 stout setae. Maxilla 2 (Figure 2F) plates slender; inner plate with thin setae proximally, lateral margin with long simple setae and setae half pectinate and half plumose; outer plate, apical margin with the same setae. Maxilliped (Figure 2A), inner plate narrow, half of the width of outer plate, lateral margin with plumose setae, apical margin with two robust and small setae; outer plate, rounded, 1.3 �� longer than inner plate, lateral and apical margin with simple setae; palp 5-articulate, first article small, naked, article 2, margin elongated laterally, with simple setae; article 3, 1.5 �� longer than article 2, laterals margins setose; article 4 with setae in laterals margins and apical margin; dactylus, surface with small setae, with nail. Gnathopod 1 (Figure 3A) coxa reduced, anterior margin rounded, dorsal and posterior margins straight, ventral margin truncated; basis, tapering distally, 4.5 �� longer than wide, anterior margin with setae, posteroventral margin with three setae; ischium elongated, 0.6 �� the basis size, anterior and posterior margins with thin setae; merus short, half of the carpus width, posterior margin with a tuft of setae; carpus and propodus subequal in length, both have tufts of setae on posterior margin; propodus, anterior margin with a tuft of long setae, palm serrated, apical margin with a tuft of setae and two subapical stout setae; dactylus about 2 �� longer than wide, inner margin with two cusps and one robust setae in apical margin. Gnathopod 2 (Figure 3B) coxa about twice longer than coxa 1, with facial setae; basis, approximately 5 �� longer than wide, anterior margin with thin setae; ischium, anterior margin convex, with thin setae, posteroventral corner with a tuft of setae; merus small, about half of the length of carpus; carpus anterior margin with some plumose setae, posterior margin covered by plumose setae; propodus subrectangular, antero and posteroventral margins rounded, both covered by plumose setae, palm transverse, convex, proximally with fine setae and distally microserrated, bearing nine submarginal robust setae; dactylus chelate, curved posteriorly, anterior margin with one setae, posterior margin reaches all palm. Pereopod 3 (Figure 4A) coxa, 2.6 �� longer than wide, ventral margin with setae; basis 3.5 �� longer than wide, anterior, posterior and posteroventral margin with setae, ischium 4 �� smaller than basis, posterior margin setose; merus anteroventral corner expanded, with a tuft of setae, posterior margin with carpus 0.6 �� the merus length, anteroventral corner with a tuft of setae, posterior margin setose; propodus with three setae in anterior margin, posterior margin with simple setae and a robust setae in posteroventral corner; dactylus, posterior margin with cusps proximally and concave medially. Pereopod 4 (Figure 4B) coxa expanded posteriorly, basis anterior and posterior with two tufts of setae, anteroventral and posteroventral corner with a tuft of setae; ischium small, 0.3 �� the length of basis; merus anterior margin slightly convex proximally, posterior margin setose; carpus, about half of the length of the merus, anteroventral corner with a tuft of setae; posterior margin setose; propodus with some setae in anterior margin and posterior margin, posteroventral corner with a robust setae; dactylus with cusps and concave medially, with nail. Pereopod 5 (Figure 4C) coxa rounded; basis posteriorly expanded, posterior margin serrated, anterior margin with tufts of setae, posterior margin with one seta, posteroventral corner with tuft of setae; ischium anteroventral corner with tuft of setae; merus anterior margin with tufts of setae, posterior margin expanded, with tufts of setae, carpus, anterior margin with tufts of setae, posteroventral corner with one seta; propodus, anterior margin setose, posterior margin with three tufts of setae; dactylus anterior margin with cusps, with nail. Pereopod 6 (Figure 4D) coxa, anterior margin concave, posterior margin convex; basis expanded posteriorly, posterior margin serrated, anterior margin slightly concave, with setae, posterior margin with setae, ischium short, anterior margin with setae, merus, anterior margin with tufts of setae, posterior margin expanded with small setae; carpus with two tufts of setae in anterior margin, one on posteroventral corner; propodus anterior margin setose and posterior margin with three tufts of setae; dactylus with nail. Pereopod 7 (Figure 5A) coxa, anterior margin slightly concave, posterior margin convex; basis posterior expanded posteroventrally, margin convex, anterior margin concave medially, setose; ischium subquadrate, anterior margin with setae; merus, anterior and posterior margins with tufts of setae, posterior margin expanded; carpus anterior margin with tufts of setae, anteroventral and posteroventral corner with tuft of setae; propodus subrectangular, anterior margin with tufts of setae, posterior margin with three, posteroventral corner with a small plumose seta; dactylus with nail. Epimeral plates 1 and 2 with triangular ventral process. Epimeral plate 1 posterior margin strongly convex, ventral margin slightly concave. Epimeral plate 2, posterior margin sinuous, posteroventral corner acute, ventral margin with row of setae. Epimeral plate 3, posterior margin slightly convex, posteroventral corner without spine (Figure 4E). Uropod 1 (Figure 5B) slightly shorter than uropod 2, peduncle and rami subequal in length, dorsal margins of peduncle and rami with robust setae. Uropod 2 (Figure 5C) peduncle and rami subequal in length, ventral margins of peduncle and rami with robust setae. Uropod 3 (Figure 5D) peduncle 1.7 �� longer than wide, subconical, posterior margin concave proximally the dorsal and ventral margins, forming an acute rounded angle; rami subequal in length and 1.4 �� longer than peduncle, inner ramus, longer than first article of outer ramus, dorsal margin with plumose setae, ventral margin with three subterminal setae, outer ramus 2-articulate, dorsal margin with plumose setae, ventral margin with three setae. Telson (Figure 5E) 80% cleft, apical margin truncate with cusp at the innerdistal corner, each lobe with one facial and two subterminal small stout setae. Remarks. According to current papers (Diffenthal & Horton 2007, Narahara et al. 2012, Lowry & Kilgallen 2014) Stephonyx biscayensis is a widely distributed species and has some divergences in intraspecific level. Some works (Stephensen 1923, Schellenberg 1926, Chevreux 1927, Chevreux 1935, Griffiths 1975, K.H. Barnard 1940) do not have illustrations or have small and simple descriptions which causes great confusion. With respect to the descriptions of S. biscayensis, in general, K.H. Barnard (1916) described a species from Cape Point (South Africa) with a character divergent from than all other species: maxilla 1, outer plate with 8 setal teeth. All other species have 11 setal teeth on the outer plate. Comparing this species with the new species, the African species has a mandible with less setae on the borders of the molar; maxilla 1, palp with 5 robust setae, and maxilliped, inner plate with 3 robust apical setae, while the Brazilian species has a molar with slender setae; 10 setae in apex of palp of maxilla 1 and maxilliped with inner plate with 2 robust setae. The material from off Kenya, Barnard, J.L (1961) described some differences between this specimen and that described by Chevreux (1908): ���mandibular molar is more pointed and hairy, and lacks a triturating surface; the outer plates of the maxilliped have apical spines; the telson has an apical notch on each lobe; the third palp article of the mandible is slightly stouter; and the inner plate of maxilla 2 is slightly stouter���. The new species has a different number of articles in the antennae from the original description of S. biscayensis, with 26 articles in primary flagellum of antenna 1 and 53 in flagellum of antenna 2, and 19 articles in primary flagellum of antenna 1 and 33 articles in flagellum of antenna 2, respectively. The setose molar of mandible also differs from specimen described by Ledoyer in 1986, in which the molar is less setose and conical. Nevertheless, the other characters are similar between the Stephonyx transversus sp. nov. and S. biscayensis sensu Ledoyer (1986), including the transverse palmar angle of gnathopod 2 and the presence of robust setae in distal margin of propodus of pereopod 4 and the cusps in posterior margin of dactylus. Comparing the illustration of the Caribbean specimen (Lowry & Stoddart 1997), the new species has the head with anteroventral corner less convex, similar to head of that described by Narahara et al. (2012). These authors cite the presence of a rounded posteroventral corner of epimeral plate 2, not cited by any other work. This character is not shared by the Brazilian species. Stephonyx transversus sp. nov. differs from the species described by Lowry & Stoddart (1989), from southwestern Ireland, the paper in which the genus Stephonyx is described, in having the following combination of characters (S. biscayensis sensu Lowry & Stoddart, 1989 in parentheses): primary flagellum of antenna 1 with 26 articles (16 articles); flagellum of antenna 2 with 53 articles (31 articles); mandible molar with slender setae (molar with small and tiny setae); maxilla 1 inner plate large, one stout subterminal seta and five small setae, all plumose (inner plate narrow with three apically plumose setae); gnathopod 2 palm transverse, convex, margin microserrated (slightly acute, sinuous and smooth); pereopod 6 basis anterior margin with a convex prominence (almost straight); pereopod 7 coxa, anterior margin slightly concave (almost straight); epimeral plate 3, posterior margin without spine (weakly pointed); uropod 3 rami subequal in length (inner ramus reach half of the article 2 of outer ramus); telson cleft 80% (65% in the text ��� but according to figure 3 on page 8 the telson is cleft about 90% of its length). According to Lowry & Stoddart (1997), the description of the head in Lowry & Stoddart (1989) is incorrect, ���the lobe is much broader and rounder and tends to curl in toward the body at the lower margin���, which is a character shared with the Stephonyx transversus sp. nov. The new Brazilian species differs from S. uncinatus Senna & Serejo, 2007, by the presence of the following characters states: anteroventral margin of upper lip forming a setose acute angle; mandible with a robust lacinia mobilis; gnathopod 1 propodus, palm with two subapical stout setae, dactylus, inner margin with two cusps; pereopods 3 and 4 dactyli with cusps on posterior margin; epimeral plate 3 ventral margin naked, posteroventral corner without spine; and telson, apical margin truncate with cusp, bearing two small stout setae. On the other hand, S. uncinatus has: the ventral margin of upper lip rounded; the mandible with the lacinia mobilis reduced and slightly setose; gnathopod 1, propodus, palm with three subapical curved stout setae, dactylus, inner margin without cusps; dactylus of pereopods 3 and 4, posterior margin smooth; epimeral plate 3, ventral margin anteriorly setose, posteroventral corner produced in a small subacute spine; and telson, apical margin rounded and smooth. Because of the similarity among specimens, the authors cited above have described them as S. biscayensis. However, we have pointed out that there are differences between the descriptions, and revisions must be made to confirm that all specimens described since Lowry & Stoddart (1989) could be classified as S. biscayensis., Published as part of Sorrentino, Rayane, Souza-Filho, Jesser F. & Senna, Andr�� R., 2018, A new species of Stephonyx (Amphipoda, Amphilochida, Lysianassoidea) from Brazil, pp. 537-546 in Zootaxa 4388 (4) on pages 538-545, DOI: 10.11646/zootaxa.4388.4.5, http://zenodo.org/record/1189120, {"references":["Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. https: // doi. org / 10.1080 / 00222933.2012.675598","Lowry, J. K. & Kilgallen, N. M. (2014) A generic review of the lysianassoid family Uristidae and a description of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae). Zootaxa, 3867 (1), 1 - 92. https: // doi. org / 10.11646 / zootaxa. 3867.1.1","Stephensen, K. (1923) Crustacea Malacostraca, V: (Amphipoda, I). The Danish Ingolf-Expedition, 3, 1 - 100.","Schellenberg, A. (1926) Amphipoda 3: Die Gammariden der Deutschen Tiefsee-Expedition. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer \" Valdivia \" 1898 - 1899, 23, 193 - 243, pl. 195.","Chevreux, E. (1927) Malacostraces (suite). III. Crustaces Amphipodes. Expeditions Scientifiques du \" Travailleur \" et du \" Talisman \" pendant les annees 1880, 1881, 1882, 1883, 41 - 152. 151 - 114. https: // doi. org / 10.5962 / bhl. title. 13677","Chevreux, E. (1935) Amphipodes provenant des campagnes du Prince Albert Ier de Monaco. Resultats des Campagnes Scientifiques Accomplies sur son Yacht par Albert I Prince Souverain de Monaco, 90, 1 - 214, pls. 211 - 216. https: // doi. org / 10.5962 / bhl. title. 2169","Griffiths, C. L. (1975) The Amphipoda of southern Africa. Part 5. The Gammaridea and Caprellidea of the Cape Province west of Cape Agulhas. Annals of the South African Museum, 67, 91 - 181.","Barnard, K. H. (1940) Contributions to the crustacean fauna of South Africa. 12. Further additions to the Tanaidacea, Isopoda, and Amphipoda, together with keys for the identification of the hitherto recorded marine and fresh-water species. Annals of the South African Museum, 32, 381 ¯ 543.","Chevreux, E. (1908) Diagnoses d'amphipodes nouveaux provenant des campagnes de la Princesse-Alice dans l'Atlantique nord. Bulletin de l'Institut Oceanographique, 117, 1 - 13.","Lowry, J. K. & Stoddart, H. E. (1997) Amphipoda Crustacea IV. Families Aristiidae, Cyphocarididae, Endevouridae, Lysianassidae, Scopelocheiridae, Uristidae. Memoirs Hourglass Cruises, 10, 1 - 148.","Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. https: // doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14."]}

Genus Stephonyx Lowry & Stoddart, 1989 Euonyx spp.��� Stebbing, 1888: 669.���Stebbing, 1906: 19.��� Chevreux, 1908: 1.���Chevreux, 1919: 576.��� Chevreux, 1927: 47.��� Sheard, 1938: 169.���Barnard, 1967: 55.��� Griffiths, 1977: 98.��� Barnard & Karaman, 1991: 485. Type species. Euonyx biscayensis Chevreux, 1908. Composition. Stephonyx includes 14 species: S. arabiensis Diffenthal & Horton, 2007; S. biscayensis (Chevreux, 1908); S. carinatus Bellan-Santini, 1997; S. incertus Bellan-Santini, 1997; S. mytilus (Barnard & Ingram, 1990); S. laqueus (J.L. Barnard, 1967); S. normani (Stebbing, 1888); S. perexcavatus Narahara, Tomikawa & Torigoe, 2012; S. pirloti (Sheard, 1938); S. rafaeli Lowry & Kilgallen, 2014; S. scutatus (Griffiths, 1977); S. talismani (Chevreux, 1919); S. transversus sp. nov.; and S. uncinatus Senna & Serejo, 2007., Published as part of Sorrentino, Rayane, Souza-Filho, Jesser F. & Senna, Andr�� R., 2018, A new species of Stephonyx (Amphipoda, Amphilochida, Lysianassoidea) from Brazil, pp. 537-546 in Zootaxa 4388 (4) on page 538, DOI: 10.11646/zootaxa.4388.4.5, http://zenodo.org/record/1189120, {"references":["Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. https: // doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 76. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76, Zoology, 29, 1 - 1737, 210 pls.","Chevreux, E. (1908) Diagnoses d'amphipodes nouveaux provenant des campagnes de la Princesse-Alice dans l'Atlantique nord. Bulletin de l'Institut Oceanographique, 117, 1 - 13.","Chevreux, E. (1927) Malacostraces (suite). III. Crustaces Amphipodes. Expeditions Scientifiques du \" Travailleur \" et du \" Talisman \" pendant les annees 1880, 1881, 1882, 1883, 41 - 152. 151 - 114. https: // doi. org / 10.5962 / bhl. title. 13677","Sheard, K. (1938) The amphipod genera Euonyx, Syndexamine and Paradexamine. Records of the South Australian Museum, 6, 169 - 186.","Griffiths, C. L. (1977) Deep-sea amphipods from west of Cape Point, South Africa. Annals of the South African Museum, 73 (4), 93 - 104.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 ¯ 866.","Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Bellan-Santini, D. (1997) Amphipods of the cold-seep community on the south Barbados accretionary prism. Crustaceana, 70, 1 - 30. https: // doi. org / 10.1163 / 156854097 X 00311","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. https: // doi. org / 10.1080 / 00222933.2012.675598","Lowry, J. K. & Kilgallen, N. M. (2014) A generic review of the lysianassoid family Uristidae and a description of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae). Zootaxa, 3867 (1), 1 - 92. https: // doi. org / 10.11646 / zootaxa. 3867.1.1","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14."]}

Sorrentino, Rayane, Souza-Filho, Jesser F., Senna, André R. (2018): A new species of Stephonyx (Amphipoda, Amphilochida, Lysianassoidea) from Brazil. Zootaxa 4388 (4): 537-546, DOI: https://doi.org/10.11646/zootaxa.4388.4.5

The uristid lysianassoids are reported for the first time from Korean waters with a redescription of Anonyx abei Takekawa & Ishimaru, 2001 and the description of Anonyx exilipes sp. n. Anonyx abei is characterized by a distinctively small projection of the posterodistal corner on epimeron 3, different from all species of the Anonyx nugax group which share a constriction at the point of insertion of a distal seta on the inner ramus of uropod 2. Anonyx exilipes sp. n. is included in the Anonyx laticoxae group characterized by the unconstricted inner ramus of uropod 2. This new species is distinguished from other A. laticoxae group species by the longer and more slender carpus and propodus of pereopod 6, and the non-lobate merus of pereopod 7.

The Carcinological Collection of División Zoología Invertebrados, Museo de La Plata (FCNyM-UNLP) includes of 110 type lots of 42 species. A list of types of the crustacean orders Anostraca (8 species), Diplostraca (5 species), Arguloida (3 species), Cyclopoida (1 species), Poecilostomatoida (8 species), Siphonostomatoida (2 species), Podocopida (4 species), Amphipoda (2 species), Isopoda (2 species), Mysida (2 species) and Decapoda (5 species) is presented. Species names are listed in systematical order, including type locality, collection number, current taxonomic status and original bibliographic reference. For parasite and commensal species, type host and site of infection are also provided., Instituto de Limnología "Dr. Raúl A. Ringuelet", Facultad de Ciencias Naturales y Museo

The amphipod fauna from hydrothermal vent habitats on the Juan de Fuca Ridge and from experimental wood deployments are examined. The material revealed, among others, a number of lysianassid species belonging to the genera, Paronesimoides Pirlot, 1933 and Schisturella Norman, 1900, and a species of the family Sebidae, belonging to the genus Seba Bate, 1862. The new species: Paronesimoides voightae, Schisturella hansgeorgi, and Seba bathybia are described. A key to Paronesimoides and Schisturella are given

Genus Debroyerella gen. nov. Type species. Cheirimedon similis Thurston, 1974, by present designation. Included species. Debroyerella includes 3 species: D. fougneri (Walker, 1903); D. similis (Thurston, 1974); D. solidus (Andres, 1986). Etymology. Named for our friend Claude De Broyer in recognition of his life-long contribution to Antarctic amphipod biology. Gender feminine. Diagnostic description. Antenna 1 peduncle article 1 long (more than twice as long as broad); flagellum with weak 1 -field callynophore, or callynophore absent. Mandible molar columnar, with fully triturating oval surface; palp attached midway. Maxilliped outer plate very small, not reaching article 3 of palp. Gnathopod 1 subchelate, coxa large, almost as large as coxa 2, not tapering distally, anterior margin slightly concave; carpus compressed. Telson moderately cleft. Remarks. With a subchelate gnathopod 1, displaying a compressed carpus and large propodus, Debroyerella is very similar to Abyssorchomene De Broyer, 1984 and Koroga Holmes, 1908. Koroga differs in having a short (less than 1.5 �� longer than broad) antenna 1 peduncle article 1, a well-developed 2 -field callynophore, a mandible molar that forms a setose tongue, and a notched telson. Species of Abyssorchomene also have a short antenna 1 peduncle article 1 and strong 2 -field callynophore. Distribution. Antarctica., Published as part of Lowry, J. K. & Kilgallen, N. M., 2015, Debroyerella gen. nov. and Ulladulla gen. nov., two new lysianassoid genera (Crustacea, Amphipoda, Lysianassoidea), pp. 153-162 in Zootaxa 3920 (1) on page 154, DOI: 10.11646/zootaxa.3920.1.7, http://zenodo.org/record/231901, {"references":["Thurston, M. H. (1974) Crustacea Amphipoda from Graham Land and the Scotia Arc, collected by Operation Tabarin and the Falkland Islands Dependencies Survey, 1944 - 59. British Antarctic Survey Scientific Reports, 85, 1 - 89.","Walker, A. O. (1903) Amphipoda of the ' Southern Cross' Antarctic Expedition. Journal of the Linnean Society of London, Zoology, 29, 38 - 64, pls. 37 - 11.","Andres, H. G. (1986) Atylopsis procerus sp. n. und Cheirimedon solidus sp. n. aus der Weddell See sowie Anmerkungen zu Orchomenella pinguides Walker, 1903. (Crustacea: Amphipoda: Gammaridea). Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 83, 117 - 130.","De Broyer, C. (1984) Evolution du complexe Orchomene Boeck (Amphipoda Lysianassidae). Annales de la Societe Royale Zoologique de Belgique, 114, 197 - 198.","Holmes, S. J. (1908) The Amphipoda collected by the U. S. Bureau of Fisheries steamer \" Albatross \" off the west coast of North America, in 1903 and 1904, with descriptions of a new family and several new genera and species. Proceedings of the United States National Museum, 35, 489 - 543. http: // dx. doi. org / 10.5479 / si. 00963801.35 - 1654.489"]}

Debroyerella similis (Thurston, 1974) Cheirimedon fougneri.��� Walker, 1907: 9.��� Schellenberg, 1926: 263, fig. 13.��� K.H. Barnard, 1930: 326.��� Nicholls, 1938: 23 (in part).��� Shoemaker, 1945: 289 (in part). Cheirimedon similis Thurston, 1974: 54, figs 19 f���i, 20, 21.��� Lowry & Bullock, 1976: 86.��� Lincoln & Hurley, 1981: 108.��� De Broyer, 1983: 185, figs 50���52.��� Slattery & Oliver, 1986: 173.��� De Broyer & Jażdżewski, 1993: 66.��� Barnard & Karaman, 1991: 475. not Cheirimedon similis.��� Andres, 1983: 185. (= C. solidus). Types. Holotype, female, 19 mm, NHM 1972: 88:l. Allotype, male, 16 mm, NHM 1972: 89: 1. Paratypes, NHM 1972: 90: 1000; NHM 1972: 91:l, NHM 1972: 92: 1000; NHM 1907: 6: 6: 76-81, NHM 1930: 8: 1: 18-19. Other paratypes are held by the British Antarctic Survey (14 specimens); the Institute of Oceanographic Sciences (6 specimens); 11 specimens ZMB 20310; 10 specimens ZMUC. Type locality. Marguerite Bay, Stonington Island, Antarctic Peninsula. Description. Head, lateral cephalic lobe rounded; eyes reniform. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore, 6 -articulate; primary flagellum with weak 1 -field callynophore, or without callynophore; robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae absent; calceoli absent. Labrum (epistome and upper lip) separate; epistome produced equally with upper lip, straight; upper lip not produced. Mandible molar an (?) asymmetrically reduced column, proximally setose, distally triturating; left lacinia mobilis a long, slender robust seta. Maxilla 1 outer plate setal-teeth in a welldeveloped 7 / 4 crown arrangement; palp distal margin with apical robust setae. Maxilla 2 inner plate significantly shorter than outer plate. Maxilliped outer plate with 2 long (one slender, one broad) apical robust setae. Gnathopod 1 coxa large, about as long as coxa 2, subrectangular with straight to very slightly concave anterior margin, not expanded distally; basis sparsely setose along anterior margin; ischium short; propodus margins subparallel, palm slightly acute, entire, straight; dactylus simple. Gnathopod 2 subchelate; propodus palm transverse, straight; dactylus fitting palm. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa slightly longer than broad, producing posterior lobe; basis longer than broad, posterior margin weakly serrate; carpus 2.5 �� longer than wide; propodus 4 �� times longer than wide. Pereopod 6 carpus 3 �� longer than wide; propodus 3.5 �� times longer than wide. Pereopod 7 basis posterior margin evenly rounded, posterodistally produced less than halfway along merus; carpus 2.5 �� longer than wide; propodus 3 �� times longer than wide. Epimeron 3 posterior margin smooth or minutely serrate, posteroventral corner subquadrate and forming a very weak spine. Urosomite 1 not projecting over urosomite 2, with anterodorsal notch and slightly rounded boss. Uropod 2 inner ramus without constriction. Uropod 3 inner ramus slightly shorter than outer ramus, outer ramus article 2 short, with plumose setae on both rami. Telson subequal in length and width, cleft to 55 % of length, with dorsal robust setae, and 1 apical robust seta on each lobe. Depth range. 7��� 385 m. Remarks. See remarks under D. fougneri for a comparison with that species. Debroyerella similis can be distinguished from D. solidus by the shorter and more deeply cleft telson, and the narrower coxa and propodus of gnathopod 1. Distribution. Antarctica. Gauss winter station, Davis Sea (Schellenberg 1926); McMurdo Sound, Ross Sea (Walker 1907); Stonington Island, Antarctic Peninsula (Thurston 1974)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2015, Debroyerella gen. nov. and Ulladulla gen. nov., two new lysianassoid genera (Crustacea, Amphipoda, Lysianassoidea), pp. 153-162 in Zootaxa 3920 (1) on pages 155-156, DOI: 10.11646/zootaxa.3920.1.7, http://zenodo.org/record/231901, {"references":["Thurston, M. H. (1974) Crustacea Amphipoda from Graham Land and the Scotia Arc, collected by Operation Tabarin and the Falkland Islands Dependencies Survey, 1944 - 59. British Antarctic Survey Scientific Reports, 85, 1 - 89.","Walker, A. O. (1907) Crustacea III. - Amphipoda. National Antarctic Expedition 1901 - 1904, Natural History, 3, 1 - 38, pls. 31 - 13.","Schellenberg, A. (1926) Die Gammariden der Deutschen Sudpolar-Expedition 1901 - 1903. Deutsche Sudpolar-Expedition, 18, 235 - 414.","Barnard, K. H. (1930) Crustacea. Part XI. - Amphipoda. British Antarctic (\" Terra Nova \") Expedition, 1910, Natural History Reports, Zoology, 8, 307 - 454.","Nicholls, G. E. (1938) Amphipoda, Gammaridea. Australasian Antarctic Expedition 1911 - 14, Scientific Reports, Series C, 2, 1 - 145.","Shoemaker, C. R. (1945) Amphipoda of the United States Antarctic Service Expedition 1939 - 1941. Proceedings of the American Philosophical Society, 89, 289 - 293.","Lowry, J. K. & Bullock, S. (1976) Catalogue of the marine gammaridean Amphipoda of the Southern Ocean. Royal Society of New Zealand Bulletin, 16, 1 - 187.","Lincoln, R. J. & Hurley, D. E. (1981) The calceolus, a sensory structure of gammaridean amphipods (Amphipoda: Gammaridea). Bulletin of the British Museum (Natural History), Series Zoology, 40, 103 - 116.","De Broyer, C. (1983) Recherches sur la systematique et l'evolution des crustaces amphipodes gammarides antarctiques et subantarctiques. PhD Thesis, Universite de Louvain, 468 pp.","Slattery, P. N. & Oliver, J. S. (1986) Scavenging and other feeding habits of lysianassid amphipods (Orchomene spp.) from McMurdo Sound, Antarctica. Polar Biology, 6, 171 - 177. http: // dx. doi. org / 10.1007 / BF 00274880","De Broyer, C. & Jazdzewski, K. (1993) Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut Royal des Sciences Naturelles de Belgique, 73, 1 - 154.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.91","Andres, H. G. (1983) Die Gammaridea (Crustacea: Amphipoda) der Deutschen Antarktis-Expeditionen 1975 / 76 und 1977 / 78. 3. Lysianassidae. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 80, 183 - 220."]}

Debroyerella solidus (Andres, 1986) Cheirimedon similis.��� Andres, 1983: 185. Cheirimedon solidus Andres, 1986: 120, figs 5, 6.��� De Broyer & Jażdżewski, 1993: 66.��� De Broyer et al., 2007: 138. Types. Holotype, male, 11 mm, ZMH K 33164. Type locality. Weddell Sea, Antarctica (77 ��36.0'S 18 ��39.3'W). Description. Head, lateral cephalic lobe rounded; eyes reniform. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore, 4 -articulate; primary flagellum with weak 1 -field callynophore; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae present; calceoli absent. Labrum (epistome and upper lip) separate; epistome produced equally with upper lip, straight; upper lip produced, rounded apically. Mandible molar an (?) asymmetrically reduced column, proximally setose, distally triturating; left lacinia mobilis a long, slender robust seta. Maxilla 1 outer plate setal-teeth in a well-developed 7 / 4 crown arrangement; palp distal margin with apical robust setae. Maxilla 2 inner plate significantly shorter than outer plate. Maxilliped outer plate with 2 long (one slender, one broad) apical robust setae. Gnathopod 1 coxa large, about as long as coxa 2, subrectangular with slightly concave anterior margin, slightly expanded distally; basis sparsely setose along anterior margin; ischium short; propodus margins subparallel, palm transverse or slightly acute, entire, convex, minutely serrate; dactylus simple. Gnathopod 2 subchelate; propodus palm transverse, straight; dactylus fitting palm. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa about as long as broad, producing slight posterior lobe; basis longer than broad, posterior margin weakly serrate; carpus 2 �� longer than wide; propodus 3 �� times longer than wide. Pereopod 6 carpus 2.5 �� longer than wide; propodus 3 �� times longer than wide. Pereopod 7 basis posterior margin evenly rounded, posterodistally produced less than halfway along merus; carpus 2.5 �� longer than wide; propodus 3 �� times longer than wide. Epimeron 3 posterior margin smooth or minutely serrate, posteroventral corner subquadrate. Uropod 2 inner ramus without constriction. Uropod 3 inner ramus slightly shorter than outer ramus; outer ramus article 2 short, with plumose setae on both rami. Telson distinctly longer than broad (length 1.6 �� width), cleft to 35 % of length, with 1 apical robust seta on each lobe. Depth range. 0���201 m in water depth of 1900 m. Remarks. Most similar to D. fougneri, Debroyerella solidus differs from that species by the shorter and stouter carpus and propodus of pereopods 5���7. Distribution. Antarctica. Scotia-Faunengebiet and Weddell Sea (Andres 1986)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2015, Debroyerella gen. nov. and Ulladulla gen. nov., two new lysianassoid genera (Crustacea, Amphipoda, Lysianassoidea), pp. 153-162 in Zootaxa 3920 (1) on page 156, DOI: 10.11646/zootaxa.3920.1.7, http://zenodo.org/record/231901, {"references":["Andres, H. G. (1986) Atylopsis procerus sp. n. und Cheirimedon solidus sp. n. aus der Weddell See sowie Anmerkungen zu Orchomenella pinguides Walker, 1903. (Crustacea: Amphipoda: Gammaridea). Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 83, 117 - 130.","Andres, H. G. (1983) Die Gammaridea (Crustacea: Amphipoda) der Deutschen Antarktis-Expeditionen 1975 / 76 und 1977 / 78. 3. Lysianassidae. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 80, 183 - 220.","De Broyer, C. & Jazdzewski, K. (1993) Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut Royal des Sciences Naturelles de Belgique, 73, 1 - 154.","De Broyer, C., Lowry, J., Jazdzewski, K. & Robert, H. (2007) Catalogue of the Gammaridean and Corophiidean Amphipoda (Crustacea) of the Southern Ocean with distribution and ecological data. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie, 11 (Supplement 1), 1 - 325"]}

Debroyerella fougneri (Walker, 1903) Cheirimedon fougneri Walker, 1903: 41, pl. 7, figs 1���6.��� Stebbing, 1906: 720.��� Nicholls, 1938: 23 (in part, part = C. similis).��� Shoemaker, 1945: 289 (in part, part = C. similis).��� J.L. Barnard, 1958: 90.��� Emison, 1968: 203, fig. 10, tables 10, 12 (ecology).��� J.L. Barnard, 1969: 314.��� Thurston & Allen, 1969: 357.��� Bellan-Santini, 1972 b: 689, pls 6, 7.��� Arnaud, 1974: 572, 648.��� Thurston, 1974: 50, figs 17, 18, 19 a���e, table 1.��� Lowry & Bullock, 1976: 86.��� De Broyer, 1983: 182.��� Barnard & Karaman, 1991: 475.��� Klages, 1991: 50.��� De Broyer & Jażdżewski, 1993: 66.��� Johnson et al., 2001: table 3.��� La Mesa et al., 2004: 724, table 2 (ecology).��� De Broyer et al. 2007: 137. not Cheirimedon fougneri. Walker, 1907: 9.��� Schellenberg, 1926: 263, fig. 13.��� K.H. Barnard, 1930: 326. (= C. similis). Types. Syntypes, NHM 1903: 10: 15: 13���15 (9 specimens in alcohol + 11 slides). Type locality. Ross Sea (78 �� 35 'S), surface. Description. Head, lateral cephalic lobe rounded; eyes reniform. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore, 5 -articulate; primary flagellum with weak 1 -field callynophore, or without callynophore; robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae present; calceoli absent. Labrum (epistome and upper lip) separate; epistome produced equally with upper lip, straight; upper lip not produced. Mandible molar an asymmetrically reduced column, proximally setose, distally triturating; left lacinia mobilis a long, slender robust seta. Maxilla 1 outer plate setalteeth in a well-developed 7 / 4 crown arrangement; palp distal margin with apical robust setae. Maxilla 2 inner plate significantly shorter than outer plate. Maxilliped outer plate with 2 long (one slender, one broad) apical robust setae. Gnathopod 1 coxa large, about as long as coxa 2, subrectangular with slightly concave anterior margin, slightly expanded distally; basis without setae along anterior margin; ischium short; propodus large, margins subparallel, palm slightly acute, entire, subtly sinusoidal, with small, irregular serrations; dactylus simple. Gnathopod 2 subchelate; propodus palm transverse to slightly obtuse, slightly concave; dactylus fitting palm. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa about as long as broad, posterior lobe slightly produced; basis longer than broad, posterior margin weakly serrate; carpus 4 �� longer than wide; propodus 5 �� longer than wide. Pereopod 6 carpus 4 �� longer than wide; propodus 5 �� longer than wide. Pereopod 7 basis posterior margin evenly rounded, posterodistally produced less than halfway along merus; carpus 4 �� longer than wide; propodus 4 �� longer than wide. Epimeron 3 posterior margin smooth or very minutely serrate distally, posteroventral corner forming small, weak spine. Urosomite 1 not projecting over urosomite 2, with anterodorsal notch and slightly rounded boss. Uropod 2 inner ramus without constriction. Uropod 3 inner ramus two-thirds as long as outer ramus; outer ramus article 2 short, with plumose setae on both rami. Telson distinctly longer than broad (length 1.4 �� width), cleft to 35 % of length, without dorsal robust setae, with 1 apical robust seta on each lobe. Male (sexually dimorphic characters). Calceoli present on antennae 1 and 2. Depth range. 0 m, surface (De Broyer et al. 2007). Remarks. The variation of character states between the three currently described species of Debroyerella gen. sp. nov. is extremely subtle, and the species are morphologically very similar. Debroyerella fougneri is distinguished from D. similis (Thurston, 1974) by the broader and more distally expanded gnathopod 1 coxa, the shallower coxa of pereopod 5 and the longer and more weakly cleft telson. The same species can be separated from D. solidus (Andres, 1986) by the less convex and more sinuous palm of gnathopod 1, and the longer and more slender carpus and propodus of pereopods 5���7. Distribution. Antarctica. Ad��lie Coast (Nicholls 1938); Palmer Archipelago (Shoemaker 1945); Shackleton Glacier (Nicholls 1938); Ross Sea (Shoemaker 1945, La Mesa et al. 2004); Weddell Sea (Klages 1991); Davis Sea (Johnson et al. 2001)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2015, Debroyerella gen. nov. and Ulladulla gen. nov., two new lysianassoid genera (Crustacea, Amphipoda, Lysianassoidea), pp. 153-162 in Zootaxa 3920 (1) on pages 154-155, DOI: 10.11646/zootaxa.3920.1.7, http://zenodo.org/record/231901, {"references":["Walker, A. O. (1903) Amphipoda of the ' Southern Cross' Antarctic Expedition. Journal of the Linnean Society of London, Zoology, 29, 38 - 64, pls. 37 - 11.","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Nicholls, G. E. (1938) Amphipoda, Gammaridea. Australasian Antarctic Expedition 1911 - 14, Scientific Reports, Series C, 2, 1 - 145.","Shoemaker, C. R. (1945) Amphipoda of the United States Antarctic Service Expedition 1939 - 1941. Proceedings of the American Philosophical Society, 89, 289 - 293.","Barnard, J. L. (1958) Index to the families, genera, and species of the gammaridean Amphipoda (Crustacea). Allan Hancock Foundation Publications, Occasional Paper, 19, 1 - 145.","Emison, W. B. (1968) Feeding preferences of the Adelie Penguin at Cape Crozier, Ross Island. Antarctic Research Series, 12, 191 - 212.","Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535. http: // dx. doi. org / 10.5479 / si. 03629236.258.1","Thurston, M. H. & Allen, E. (1969) Type material of the families Lysianassidae, Stegocephalidae, Ampeliscidae and Haustoriidae (Crustacea: Amphipoda) in the collections of the British Museum (Natural History). Bulletin of the British Museum (Natural History), Series Zoology, 17, 347 - 388.","Bellan-Santini, D. (1972) Amphipodes provenant des contenus stomacaux de trois especes de poissons Nototheniidae recoltes en Terre Adelie (Antarctique). Tethys, 4, 683 - 702.","Arnaud, P. M. (1974) Contribution a la bionomie marine benthique des regions antarctiques et subantarctiques. Tethys, 6, 465 - 656.","Thurston, M. H. (1974) Crustacea Amphipoda from Graham Land and the Scotia Arc, collected by Operation Tabarin and the Falkland Islands Dependencies Survey, 1944 - 59. British Antarctic Survey Scientific Reports, 85, 1 - 89.","Lowry, J. K. & Bullock, S. (1976) Catalogue of the marine gammaridean Amphipoda of the Southern Ocean. Royal Society of New Zealand Bulletin, 16, 1 - 187.","De Broyer, C. (1983) Recherches sur la systematique et l'evolution des crustaces amphipodes gammarides antarctiques et subantarctiques. PhD Thesis, Universite de Louvain, 468 pp.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.91","Klages, M. (1991) Biologische und populationsdynamische Untersuchungen an ausgewahlten Gammariden (Crustacea; Amphipoda) des sudostlichen Weddelsmeeres, Antarktis. PhD Thesis, Naturwissenschaften, Universitat Bremen, 240 pp.","De Broyer, C. & Jazdzewski, K. (1993) Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut Royal des Sciences Naturelles de Belgique, 73, 1 - 154.","Johnson, W. S., Stevens, M. & Watling, L. (2001) Reproduction and development of marine peracaridans. Advances in Marine Biology, 39, 105 - 260. http: // dx. doi. org / 10.1016 / S 0065 - 2881 (01) 39009 - 0","La Mesa, M., Salu, M. & Vacchi, M. (2004) Trophic ecology of the emerald notothen Trematomus bernacchii (Pisces, Nototheniidae) from Terra Nova Bay, Ross Sea, Antarctica. Polar Biology, 27, 721 - 728. http: // dx. doi. org / 10.1007 / s 00300 - 004 - 0645 - x","De Broyer, C., Lowry, J., Jazdzewski, K. & Robert, H. (2007) Catalogue of the Gammaridean and Corophiidean Amphipoda (Crustacea) of the Southern Ocean with distribution and ecological data. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie, 11 (Supplement 1), 1 - 325","Walker, A. O. (1907) Crustacea III. - Amphipoda. National Antarctic Expedition 1901 - 1904, Natural History, 3, 1 - 38, pls. 31 - 13.","Schellenberg, A. (1926) Die Gammariden der Deutschen Sudpolar-Expedition 1901 - 1903. Deutsche Sudpolar-Expedition, 18, 235 - 414.","Barnard, K. H. (1930) Crustacea. Part XI. - Amphipoda. British Antarctic (\" Terra Nova \") Expedition, 1910, Natural History Reports, Zoology, 8, 307 - 454.","Types. Syntypes, NHM 1903: 10: 15: 13 - 15 (9 specimens in alcohol + 11 slides).","Andres, H. G. (1986) Atylopsis procerus sp. n. und Cheirimedon solidus sp. n. aus der Weddell See sowie Anmerkungen zu Orchomenella pinguides Walker, 1903. (Crustacea: Amphipoda: Gammaridea). Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 83, 117 - 130."]}

Lowry, J. K., Kilgallen, N. M. (2015): Debroyerella gen. nov. and Ulladulla gen. nov., two new lysianassoid genera (Crustacea, Amphipoda, Lysianassoidea). Zootaxa 3920 (1): 153-162, DOI: http://dx.doi.org/10.11646/zootaxa.3920.1.7

Parschisturella simplex Andres, 1983 Parschisturella simplex Andres, 1983: 213, figs 13, 14.— Barnard & Karaman, 1991: 517.— De Broyer & Jażdżewski, 1993: 74.— De Broyer et al., 2007: 165. Types. Holotype, male, 16 mm, ZMH K 32410. Paratype, male 20.3 mm ZMH K 32411. Type-locality. South Georgia, Walther Herwig 1977-78, sta. 492, (55°00’S 35°30’W), 0–120 m depth. Habitat. Marine. Depth range. 0–120 m. Feeding strategies. Not recorded. Remarks. See remarks under Parschisturella martrudan. Distribution. Southern Ocean. South Georgia (Andres 1983)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 61, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Andres, H. G. (1983) Die Gammaridea (Crustacea: Amphipoda) der Deutschen Antarktis-Expeditionen 1975 / 76 und 1977 / 78. 3. Lysianassidae. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 80, 183 - 220.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","De Broyer, C. & Jazdzewski, K. (1993) Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut Royal des Sciences Naturelles de Belgique, 73, 1 - 154.","De Broyer, C., Lowry, J. K., Jazdzewski, K. & Robert, H. (2007) Catalogue of the Gammaridean and Corophiidean Amphipoda (Crusteacea) of the Southern Ocean with distribution and ecological data. In: C. De Broyer (Ed), Census of Antatrctic Marine Life: Synopsis of the Amphipoda of the Southern Ocean. Vol. 1. Bulletin de l'Institut Royal des Sciences Naturelles de Belqigue, Biologie 77, Supplement 1 (1), 1 - 325."]}

Euonyx chelatus Norman, 1867 Euonyx chelatus Norman, 1867: 202.— Robertson, 1888: 94.— Stebbing, 1888: 673.— Walker, 1889: 77.— Sars, 1891: 117, pl. 40 fig. 1.— Walker, 1892: 244.— Walker, 1895a: 294.— Walker, 1895b: 422.— Norman, 1900: 214.— Scott, 1901: 259.— Stebbing, 1906: 19.— Stephensen, 1923: 41.— Stephensen, 1929: 52, figs 14, 16.—H.B. Moore, 1932: 156.— Stephensen, 1932: 353.— Pirlot, 1933: 120 (key).— Stephensen, 1935: 33.— Moore, 1937: 117.— Jones, 1940: 25, table 1.— Stephensen, 1942: 470 (table).— Jones, 1948: 404.— Enequist, 1949: 387 (table).— Gurjanova, 1951: 159, fig. 34. J.L. Barnard, 1958: 91 (list).— Bruce, Colman & Jones, 1963: 150.— Thurston & Allen, 1969: 358.—Vader, 1978: 127.— Lincoln, 1979: 54, fig. 18.—P.G. Moore, 1984: 32.— Comely & Ansell, 1988: 114, 123.— Costello et al., 1989: 33.— Lowry & Stoddart, 1989: 519.— Barnard & Ingram, 1990: 2 (list), 3 (key).— Barnard & Karaman, 1991: 485.— Palerud & Vader, 1991: 35.— Sainte-Marie, 1991: 217, appendix 1.— Holmes et al., 1997: 186 (list).— Johnson et al., 2001: 198, table 3.— O’Reilly et al., 2001: 36.— Tzvetkova & Golikov, 2001: 88 (table). ? Opis leptochela Bate & Westwood, 1868: 501 fig. Types. Syntypes: NHM Reg. no. 1911:11:8:13684-13686 (3 specimens, alcohol), 1911:11:8:M843-M845 (3 slides). Type locality. Sleat Sound, Hebrides, North Atlantic Ocean (~ 57°10’N 5°50’W) on the sea urchin Echinus esculentus Linnaeus, 1758. Habitat. An apparent obligate ectoparasite of the sea urchin Echinus esculentus Linnaeus, 1758 (Vader 1978). Depth range. 31–900 m (H.B. Moore 1937; Stephensen 1923). Remarks. There are currently only three recognized species in Euonyx —the type species and the two new species described here. Euonyx chelatus and E. urania show some similarity. Euonyx xarifa is the least similar. It has an apically rounded lateral cephalic lobe (apically acute or subacute in E. chelatus and E. urania); no anterodistal lobe on article 1 of the antenna 1 peduncle (present in E. chelatus and E. urania); mandibular incisor vestigial (reduced in E. chelatus and E. urania); mandibular molar a large flap (absent in E. chelatus and E. urania); lacinia mobilis absent (vestigial in E. chelatus and E. urania); epimeron 3 with a rounded posteroventral corner (forming a spine spine in E. chelatus and E. urania); and the dorsal margin of urosomite 1 forming a rounded boss extending over urosomite 2 (an elongate truncated boss in E. chelatus and E. urania). Distribution. Northeast Atlantic Ocean. Coasts of Scotland (Norman 1967; Robertson 1888; Scott, 1901); Isle of Man (Bate & Westwood 1868 (as Opis leptochela); H.B. Moore 1937); Norway (Sars 1891); Wales (Walker 1892); England (Walker 1895 a, 1895b); southwest of the Faeroe Islands (Stephensen 1923); west coast of Ireland (Costello et al. 1989); Bay of Biscay (Dauvin & Sorbe 1995). Arctic Ocean. Barents Sea (Sars 1891; Tzvetkova & Golokov 2001).? Northwest Atlantic Ocean. Westof Greenland (determination uncertain) (Stephensen 1923)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 21, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Norman, A. M. (1867) Report of the committee appointed for the purpose of exploring the coasts of the Hebrides by means of the dredge. Part II. On the Crustacea, Echinodermata, Polyzoa, Actinozoa, and Hydrozoa. Report of the British Association for the Advancement of Science, 36, 193 - 206.","Robertson, D. (1888) A contribution towards a catalogue of the Amphipoda and Isopoda of the Firth of Clyde. Transactions of the Natural History Society of Glasgow, 2, 9 - 99.","Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology, 29, 1 - 1737, pls. 1731 - 1210.","Walker, A. O. (1889) Third report on the higher Crustacea of the L. M. B. C. district. Liverpool Marine Biological Committee Reports, 2, 195 - 213, pls. 10, 11.","Sars, G. O. (1891) An Account of the Crustacea of Norway, with Short Descriptions and Figures of all the Species. Vol. I. Amphipoda. Parts 4 - 9. Alb. Cammermeyer, Christiana, 144 pp., 48 pls. [pp. 69 - 212, pls. 225 - 272]","Walker, A. O. (1892) Report on the higher Crustacea of Liverpool Bay taken in 1889. Liverpool Marine Biological Committee Reports, 3, 239 - 251, pl. 215.","Walker, A. O. (1895 a) Revision of the Amphipoda of the L. M. B. C. district. Proceedings and Transactions of the Liverpool Biological Society, 9, 287 - 320, pls. 18, 19.","Walker, A. O. (1895 b) Revision of the Amphipoda of the L. M. B. C. district. Liverpool Marine Biological Committee Reports, 4, 415 - 448, pls. 418, 419.","Norman, A. M. (1900) British Amphipoda: Fam. Lysianassidae (concluded). Annals and Magazine of Natural History, Series 7, 5, 196 - 214, pls. 196. http: // dx. doi. org / 10.1080 / 00222930008678268","Scott, T. (1901) Notes on gatherings of Crustacea, collected for the most part by the steam trawler \" St. Andrew \" of Aberdeen, and examined during the year 1900. Annual Report of the Fishery Board for Scotland, Part III. Scientific Investigations, 19, 235 - 281, pl. 217.","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Stephensen, K. (1923) Crustacea Malacostraca, V: (Amphipoda, I). Danish Ingolf-Expedition, 3, 1 - 100.","Stephensen, K. (1929) Amphipoda. Die Tierwelt der Nord- und Ostsee, 14, 1 - 188.","Moore, H. B. (1932) Faunistic records for the Manx region. Annual Report of the Marine Biological Station at Port Erin, Isle of Man, 45, 152 - 159.","Stephensen, K. (1932) The Tanaidacea and Amphipoda of the Arctic. Fauna Arctica, 6, 343 - 378.","Pirlot, J. M. (1933) Les amphipodes de l'expedition du Siboga. Deuxieme partie: Les amphipodes gammarides, II: - Les amphipodes de la mer profonde. 1. (Lysianassidae, Stegocephalidae, Stenothoidae, Pleustidae, Lepechinellidae). Siboga- Expeditie, Monographie, 33 c, 114 - 167.","Stephensen, K. (1935) The Amphipoda of N. Norway and Spitsbergen with adjacent waters. Tromso Museums Skrifter, 3, 1 - 140.","Moore, H. B. (1937) Marine Fauna of the Isle of Man. Transactions of the Liverpool Biological Society, 50, 1 - 293.","Jones, N. S. (1940) The distribution of the fauna and bottom deposits off Port Erin. Proceedings of the Liverpool Biological Society, 53, 1 - 34.","Stephensen, K. (1942) The Amphipoda of N. Norway and Spitsbergen with adjacent waters. Tromso Museums Skrifter, 3, 363 - 526.","Jones, N. S. (1948) The ecology of the Amphipoda of the south of the Isle of Man. Journal of the Marine Biological Association of the United Kingdom, 27 (2), 400 - 439. http: // dx. doi. org / 10.1017 / s 0025315400025455","Enequist, P. (1949) Studies on the soft-bottom amphipods of the Skagerak. Zoologiska Bidrag fran Uppsala, 28, 297 - 492.","Gurjanova, E. F. (1951) Amphipods of the seas of the USSR and surrounding waters (Amphipoda-Gammaridea). Akademiya Nauk SSSR, Opredeliteli po Faune SSSR, 41, 1 - 1029.","Barnard, J. L. (1958) Index to the families, genera, and species of the gammaridean Amphipoda (Crustacea). Allan Hancock Foundation Publications, Occasional Paper, 19, 1 - 145.","Bruce, J. R., Colman, J. S. & Jones, N. S. (1963) Marine Fauna of the Isle of Man and its surrounding seas. Liverpool University Press, Liverpool, pp. 1 - 307. [not seen]","Thurston, M. H. & Allen, E. (1969) Type material of the families Lysianassidae, Stegocephalidae, Ampeliscidae and Haustoriidae (Crustacea: Amphipoda) in the collections of the British Museum (Natural History). Bulletin of the British Museum (Natural History), Series Zoology, 17, 347 - 388.","Lincoln, R. J. (1979) British Marine Amphipoda: Gammaridea. British Museum (Natural History), London, v + 658 pp.","Moore, P. G. (1984) The fauna of the Clyde Sea area. Crustacea: Amphipoda. University Marine Biological Station Millport, Occasional Publication, 2, 1 - 84.","Comely, C. A. & Ansell, A. D. (1988) Invertebrate associates of the sea urchin, Echinus esculentus L., from the Scottish west coast. Ophelia, 28, 111 - 137. http: // dx. doi. org / 10.1080 / 00785326.1988.10430807","Costello, M. J., Holmes, J. M. C., McGrath, D. & Myers, A. A. (1989) A review and catalogue of the Amphipoda (Crustacea) in Ireland. Irish Fisheries Investigations, Series B (Marine), 33, 1 - 70.","Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. http: // dx. doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","Barnard, J. L. & Ingram, C. (1990) Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology, 499, 1 - 80. http: // dx. doi. org / 10.5479 / si. 00810282.499","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Palerud, R. & Vader, W. (1991) Marine Amphipoda Gammaridea in north-east Atlantic and Norwegian Arctic. Tromura, Naturvitenskap, 68, 1 - 97.","Sainte-Marie, B. (1991) A review of the reproductive bionomics of aquatic gammaridean amphipods: variation of life history traits with latitude, depth, salinity and superfamily. Hydrobiologia, 223, 189 - 227. http: // dx. doi. org / 10.1007 / bf 00047641","Holmes, J. M. C., Costello, M. J. & Connor, D. W. (1997) Crustacea. In: Howson, C. M. & Picton, B. E. (Eds.), The species directory of the marine fauna and flora of the British Isles and surrounding seas. Ulster Museum Publication, Ulster Museum, Belfast, pp. 142 - 209.","Johnson, W. S., Stevens, M. & Watling, L. (2001) Reproduction and development of marine peracaridans. Advances in Marine Biology, 39, 105 - 260. http: // dx. doi. org / 10.1016 / s 0065 - 2881 (01) 39009 - 0","O'Reilly, M., Hamilton, E. & Heaney, L. (2001) New records of amphipods and leptostracans from the Forth Sea area, with notes on their copepod parasites (Siphonostomatidae: Nicothoidae). Glasgow Naturalist, 23, 35 - 42.","Tzvetkova, N. L. & Golikov, A. A. (2001) Suborder Gammaridea Dana, 1852. Explorations of the Fauna of the Seas, 51, 79 - 94.","Bate, C. S. & Westwood, J. O. (1868) A History of the British Sessile-eyed Crustacea. John Van Voorst, London, 536 pp.","Linnaeus, C. (1758) Systema naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. 10 th Edition. Laurentius Salvius, Stockholm, 824 pp. [in Latin] http: // dx. doi. org / 10.5962 / bhl. title. 542"]}

Stephonyx arabiensis Diffenthal & Horton, 2007 (Figs 40–41) Stephonyx arabiensis Diffenthal & Horton, 2007: 33, figs 1–4.— Narahara et al., 2012: 1505 (key).— Corrigan et al., 2013: fig. 5. Types. Holotype female, 26.7 mm, NHM 2007.799. Paratypes: male, 24.9 mm, NHM 2007.800; 6 large mature females, NHM 2007.801–806; 31 males, NHM 2007.807–816; 14 immature females, NHM 2007.817–826; 14 juveniles, NHM 2007.827–836. Type locality. Off the coast of Pakistan in the northern Arabian Sea (22º51.067'N 65º59.916'E), 1864 m depth, mean bottom temperature = 3.53ºC. Material examined. New South Wales. 1 specimen, AM P.96589, northeast of Coffs Harbour (30º10.88’S 153º32.22’E), 1000 m, baited trap, 12–13 August 1993, P.B Berents & R. T. Springthorpe, MV Cheryl Lee [NSW-877]; 2 specimens, AM P.96590, off Wollongong (34º32.4’S 151º22.8’E), 1000 m, baited trap, 28–29 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-972]; 4 specimens, AM P.96591, off Wollongong (34º32.4’S 151º22.8’E), 1000 m, baited trap, 28–29 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-971]; 7 specimens, AM P.96592, off Wollongong (34º32.4’S 151º22.8’E), 1000 m, baited trap, 28–29 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-973]; 7 juveniles, AM P.48101, north-east of Coffs Harbour (30°10.93’S 153°32.26’E), 963 m, baited trap, 11–12 August 1993, P.B. Berents, R. T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-862]; 2 specimens, AM P.52661; 2 specimens, AM P.49815, north-east of Coffs Harbour (30°10.88’S 153°32.22’E), 1000 m, baited trap, 12–13 August 1993, P.B. Berents, R. T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-876]; 1 specimen, AM P.43430, off Wollongong (34°32.4’S 151°22.8’E), 1000 m, baited trap, muddy sand, 27–28 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-953]; 9 specimens, AM P.43496, off Wollongong (34°32.4’S 151°22.8’E), 1000 m, baited trap, Globigerina ooze, 27–28 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-954]; 3 specimens, AM P.43446, off Wollongong (34°32.4’S 151°22.8’E), 1000 m, baited trap, 28–29 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-971]; 15 specimens, AM P.43372, north-east of Coffs Harbour (30°10.93’S 153°32.26’E), 1000 m, baited trap, Globigerina ooze, 8–9 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-1000]; 1 specimen, AM P.50071, north-east of Coffs Harbour (30°10.93’S 153°32.26’E), 1000 m, baited trap, 9–10 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Anne [NSW-1021]; 6 specimens, AM P.50080, north-east of Coffs Harbour (30°10.93’S 153°32.26’E), 1000 m, baited trap, 9–10 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-1022]. Queensland. Male 22.7 mm, AM P.96587, 2 specimens, 8.1–12.5 mm, AM P.96588, east of Flynn Reef, Queensland, Australia (16º37.82’S 146º23.08’E), 1000 m, baited trap, 6–7 June 1993, J.K. Lowry & P. Freewater, RV Sunbird [QLD-931]; 30 specimens, AM P.96593, off Flynn Reef (16º37’S 146º23’E), 1000 m, baited trap, 7–8 June 1993, J.K. Lowry & P. Freewater, RV Sunbird [QLD-950]; 6 specimens, AM P.50235, east of Flynn Reef (16°37.82’S 146°23.08’E), 1000 m, baited trap, 6–7 June 1993, J.K. Lowry, P. Freewater & W. Vader, RV Sunbird [QLD-931/ SEAS]; 6 specimens, AM P.50244; 4 specimens, AM P.57607, east of Flynn Reef (16°37.82’S 146°23.08’E), 1000 m, baited trap, 6–7 June 1993, J.K. Lowry, P. Freewater & W. Vader, RV Sunbird [QLD-932/ SEAS]; 11 specimens, AM P.50297; 3 specimens, AM P.57614, east of Flynn Reef (16°37.82’S 146°23.08’E), 1000 m, baited trap, 7–8 June 1993, J.K. Lowry, P. Freewater & W. Vader, RV Sunbird [QLD-949/ SEAS]; 3 specimens, AM P.58069, east of Flynn Reef (16°37.82’S 146°23.08’E), 1000 m, baited trap, 7–8 June 1993, J.K. Lowry, P. Freewater & W. Vader, RV Sunbird [QLD-950/ SEAS]; 2 specimens, AM P.57611; 2 specimens, AM P.49520, east of Flynn Reef (16°37.82’S 146°23.08’E), 1000 m, baited trap, 7–8 June 1993, J.K. Lowry, P. Freewater & W. Vader, RV Sunbird [QLD-948/ SEAS]; 6 specimens, AM P.47889, due east of Mooloolaba (26°36.23’S 153°50.23’E), 1006 m, baited trap, 2–3 August 1994, J.K. Lowry & K. Dempsey, MV Capricorn I [QLD-1140]. Tasmania. Many specimens, AM P.73709, Hill V, south-southeast of South East Cape (44°23.6’S 147°10.7’E), 1400 m, baited trap, 30 January 1997, CSIRO party on FRV Southern Surveyor, [SS01/97/61]. Description. Based on male, 22.7 mm, AM P.96587. Head, lateral cephalic lobe subtriangular, apically subacute. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum not forming cap, 8- articulate, terminal article not offset; primary flagellum with strong 2-field callynophore; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae present; calceoli present. Labrum, epistome and upper lip separate, with weak suture; epistome broadly rounded; upper lip produced, subacute apically. Mandible molar setose with vestigial triturating surface; palp attached about midway, article 2 not strongly broadened distally, article 3 blade-like. Maxilla 1 outer plate setal-tooth 7 present, cuspidate along most of straight inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 9 apical robust setae. Gnathopod 1 chelate; coxa reduced, significantly shorter than coxa 2, subquadrate; basis moderately setose along anterior margin, or sparsely setose along anterior margin; ischium very long (length 4 × to 6 × breadth); carpus very long (length more than 4 × breadth), subequal in length to propodus, without posterior lobe; propodus margins subparallel, palm obtuse, entire, slightly concave; dactylus simple. Gnathopod 2 propodus palm transverse, slightly concave. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa without distinct lateral ridge; basis broader than long, posterior margin not serrate. Pereopod 7 basis posterodistally produced less than halfway along merus. Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner subquadrate, producing minute spine. Urosomite 1 not projecting over urosomite 2, with anterodorsal notch and slightly rounded boss. Uropod 2 inner ramus without constriction. Uropod 3 peduncle without dorsolateral flange; outer ramus article 2 short, with strong plumose setae on both rami. Telson deeply cleft, with 1 apical robust setae on each lobe. Habitat. Marine. Feeding strategies. Scavenger (Diffenthal & Horton 2007). Depth range. 963 – 1864 m. Remarks. Our material agrees very well with the description of Diffenthal & Horton (2007). This is the first record of S. arabiensis outside the type locality in the Arabian Sea. This remarkable range extension from the north-western Indian Ocean into the South Pacific Ocean indicates a wide range for the species. There is no other species of Stephonyx known from this vast area except for the S. biscayensis of J.L. Barnard (1961) and Ledoyer (1986) from Kenya and Madagascar, which appears to be an undescribed species (see remarks under S. biscayensis). Distribution. Australia. Off the east coast from Flynn Reef, Queensland, to South East Cape, Tasmania (this study). Pakistan. Northern Arabian Sea (Diffenthal & Horton 2007).

Nagada uwedoae Lowry & Stoddart, 1995 Nagada uwedoae Lowry & Stoddart, 1995: 154, figs 34–36. –– Lowry & Stoddart, 2003: 283 (catalogue).— Lowry & Stoddart, 2009: 914, figs 5, 6. Types. Holotype, female, 3.6 mm, AM P.41605. Paratypes: 108 specimens, AM P.41606; 79 specimens, AM P.41609; 60 specimens, USNM 274112; 33 specimens, BMNH 1995.592.624; 1 make, AM P.41607; 288 specimens, AM P.41608. Type locality. Face of outer barrier between Dam Awan (Rasch Passage) and Wongad, Astrolabe Bay, Papua New Guinea (5°08.59’S 145°49.65’E), 290 m depth. Additional material examined. New South Wales. 4 specimens, AM P.50752, north-east of Coffs Harbour (30°15.93’S 153°21.9’E), 100 m, baited trap, 8–9 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-985]; 3 specimens, AM P.50750, north-east of Coffs Harbour (30°15.93’S 153°21.9’E), 100 m, Globigerina ooze, baited trap, 8–9 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-984]; 2 specimens, AM P.51132, north-east of Coffs Harbour (30°14.63'S 153°27.68'E), 199 m, baited trap, 12–13 August 1993, P.B. Berents, R. T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-882]; 1 female, AM P.69473, Wattamolla, off Providential Head (34°08'S 151°08.5'E), 59 m, baited trap, 14–15 January 1991, S.J. Keable, A. R. Parker & J.K. Lowry, MV Krista [PIO-110]. Tasmania. 10 specimens, AM P.58313; 6 specimens, AM P.51099, east of Fortescue Bay (43°06.7’S 148°13.6’E), 200 m, baited trap, 16–17 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-357]; 19 specimens, AM P.51104; 16 specimens, AM P.58317, east of Fortescue Bay (43°06.7’S 148°13.6’E), 200 m, baited trap, 17–18 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-376 & TAS-374]; 1 specimen, AM P.51100; 10 specimens, AM P.51101, east of Fortescue Bay (43°09.37’S 148°13.6’E), 300 m, baited trap, 16–17 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-359 & TAS-361]; 7 specimens, AM P.51092, east of Fortescue Bay (43°09.37’S 148°13.6’E), 300 m, baited trap, 8–9 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan [TAS-395]; 2 specimens, AM P.51105, east of Fortescue Bay (43°07.37’S 148°13.75’E), 400 m, baited trap, 17–18 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-380]; 1 specimen, AM P.57716, east of Fortescue Bay (43°08.97'S 148°15.37'E), 1000 m, baited trap, 9–10 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan [TAS-421]; 3 specimens, AM P.51103; 13 specimens, AM P.51102, east of Fortescue Bay, north of Hippolyte Rocks (43°06.7'S 148°03.45'E), 100 m, baited trap, 17–18 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-372 & TAS-371]. Habitat. Marine soft bottoms. Depth range. 59–1000 m (this study). Feeding strategies. Ascavenger taken in baited traps. Distribution. Papua New Guinea. Madang Lagoon and Astrolabe Bay (Lowry & Stoddart 1995). Australia. East coast from Queensland to Tasmania (Lowry & Stoddart 2009, this study)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 44-45, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. Vol. 19.2 B. CSIRO Publishing, Melbourne, 531 pp.","Lowry, J. K. & Stoddart, H. E. (2009) Lysianassidae. In: Lowry, J. K. & Myers, A. A. (Eds.), Benthic Amphipoda (Crustacea: Peracarida) of the Great Barrier Reef, Australia. Zootaxa, 2260, 561 - 597."]}

Stephonyx laqueus (J.L. Barnard, 1967) Euonyx laqueus J.L. Barnard, 1967: 55, figs 23, 24.— Sekiguchi & Yamaguchi, 1983: 7, fig. 4.— Barnard & Ingram, 1990 (key).— Barnard & Karaman, 1991: 485.— Boudrias, 1991: 13. Stephonyx laqueus.— Lowry & Stoddart, 1989: 521.— France, 1994: 71.— Diffenthal & Horton, 2007: 40 (key).— Senna & Serejo, 2007: 13 (key).— Narahara et al., 2012: 1493, 1505 (key), figs 1, 12–14. Stephonyx c.f. laqueus.— Kaufman, 1994: 56, 63, fig. 10A, B, tables 1, 2. Types. Holotype, male, 19 mm, LACM CR 1961 - 101.1. Type locality. 8.5 miles west of San Benitos Islands, Baja California, Mexico (28°20'N 115°45'W), 1187 m. Additional material. 26 specimens, LACM CR 1961 - 101.2. from the type locality. Habitat. Marine. Depth range. 330–1850 m (Sekiguchi & Yamaguchi 1983; Kaufman 1994). Feeding strategies. Scavenger, collected in baited traps. Distribution. Eastern Pacific Ocean. West coast of Baja California, Mexico (J.L. Barnard 1967; France 1994; Kaufman 1994). Western Pacific Ocean and Sea of Okhotsk. Coasts of Japan (Sekiguchi & Yamaguchi 1983; Narahara et al. 2012)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 67, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Barnard, J. L. (1967) Bathyal and abyssal gammaridean Amphipoda of Cedros Trench, Baja California. Bulletin of the United States National Museum, 260, 1 - 205. http: // dx. doi. org / 10.5479 / si. 03629236.260.1","Sekiguchi, H. & Yamaguchi, Y. (1983) Scavenging gammaridean amphipods from the deep-sea floor. Bulletin of the Faculty of Fisheries, Mie University, 10, 1 - 14.","Barnard, J. L. & Ingram, C. (1990) Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology, 499, 1 - 80. http: // dx. doi. org / 10.5479 / si. 00810282.499","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Boudrias, M. A. (1991) Methods for the study of amphipod swimming: behavior, morphology, and fluid dynamics. In: Watling, G. (Ed.), Proceedings of the VIIth International Colloquium on Amphipoda held in Walpole, Maine, USA, 14 - 16 September 1990 Hydrobiologia, 223, pp. 11 - 25.","Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. http: // dx. doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","France, S. C. (1994) Genetic population structure and gene flow among deep-sea amphipods, Abyssorchomene spp., from six California Continental Borderland basins. Marine Biology, 118, 67 - 77. http: // dx. doi. org / 10.1007 / bf 00699220","Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598","Kaufman, R. S. (1994) Structure and function of chemoreceptors in scavenging lysianassoid amphipods. Journal of Crustacean Biology, 14 (1), 54 - 71. http: // dx. doi. org / 10.1163 / 193724094 x 00470"]}

Euonyx xarifa sp. nov. (Figs 13–15) Types. Holotype, female, 10.7 mm, AM P.68882, east of Cape York, Queensland, Australia (11°35.62’S 145°28.42’E), 1770–1863 m, epibenthic sled, 22 August 1988, P.A. Hutchings et al., RV Franklin [FR0688-14]. Paratype, male, 8.5mm, AM P.68883, same collection details as holotype. Type locality. East of Cape York, Queensland, Australia (11°35.62’S 145°28.42’E), 1770–1863 m east of Cape York, Queensland, Australia (11°35.62’S 145°28.42’E), 1770–1863 m. Etymology. Named for the pearling lugger ‘Xarifa’ one of the fleet wrecked off Cape York (probably Thursday Island) during the severe cyclone Mahine on 4 March 1899; used as a noun in apposition. Description. Based on holotype, female, 10.7 mm, AM P.68882. Head lateral cephalic lobes small, rounded; eyes apparently absent. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore, 4-articulate, terminal article large, offset; primary flagellum with strong 2-field callynophore; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae absent; flagellum short; calceoli absent. Labrum, epistome and upper lip separate. Mandible incisor very reduced, left and right slightly asymmetrical; molar an asetose flap; palp attached distally, article 2 with central bulge. Maxilla 1 outer plate setal-tooth 7 present, not cuspidate; palp distal margin with apical robust setae. Maxilliped outer plate without apical robust setae. Gnathopod 1 chelate; coxa vestigial, significantly shorter than coxa 2, subquadrate; basis sparsely setose along anterior margin; ischium long (length 2 × to 4 × breadth); carpus long (length 2 to 4 × breadth), longer than propodus, without posterior lobe; propodus margins subparallel, palm obtuse, entire, slightly convex; dactylus simple. Gnathopod 2 propodus palm slightly acute. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa without distinct lateral ridge; basis broader than long, posterior margin weakly or not serrate. Pereopod 7 basis posterodistally produced less than halfway along merus. Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner subquadrate. Urosomite 1 not projecting over urosomite 2, with rounded boss. Uropod 2 inner ramus without constriction. Peduncle without dorsolateral flange; outer ramus article 2 short, without plumose setae on rami. Telson deeply cleft, or moderately cleft. Depth range. 1770–1863 m. Remarks. See remarks under E. chelatus. Distribution. Australia. Queensland., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 25-28, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734

Stephonyx carinatus Bellan-Santini, 1997 Stephonyx carinatus Bellan-Santini, 1997: 13, figs 7, 8.— Ortiz et al., 2007: 516.— Diffenthal & Horton, 2007: 39 (key).— Senna & Serejo, 2007: 13 (key).— Narahara et al., 2012: 1505 (key). Types. Holotype, 7 mm, MNHN-Am 4903. Type locality. Barbados Trench, North Atlantic Ocean (10°19.97’N 58°37.30’W), 1947 m depth. Habitat. Marine, cold seeps. Depth range. 1947 m (Bellan-Santini 1997). Distribution. North Atlantic Ocean. Barbados trench (Bellan-Santini 1997)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 67, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Bellan-Santini, D. (1997) Amphipods of the cold seep community on the South Barbados Accretionary Prism. Crustaceana, 70, 1 - 30. http: // dx. doi. org / 10.1163 / 156854097 x 00311","Ortiz, M., Martin, A. & Diaz, Y. J. (2007) Lista y referencias de los crustaceos anfipodos (Amphipoda: Gammaridea) del Atlantico occidental tropical. Revista de Biologia Tropical, 55 (2), 479 - 528. http: // dx. doi. org / 10.15517 / rbt. v 55 i 2.6026","Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598"]}

Lowry, J.K., Kilgallen, N.M. (2014): A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae). Zootaxa 3867 (1): 1-92, DOI: http://dx.doi.org/10.11646/zootaxa.3867.1.1

Parschisturella pilot sp. nov. (Figs 36–38) Types. Holotype, female, 12.0 mm, AM P.69452, north side of Cape Sorell, about 400 m outside Hannants Bight on a line toward large bluff of Ocean Beach, Tasmania, Australia (42°11.4’S 145°11.08'E), 30 m, sand, baited trap, 26 April 1991 – 27 April 1991, J.K. Lowry & S.J. Keable, Flying Scud [TAS-279]. Paratypes: 59 specimens, 7.5–12.4 mm, AM P.69451; 1 male, 12.1 mm, AM P.69453; 1 male, 9.2 mm, AM P.69454, same collection details as holotype. Type locality. North side of Cape Sorell, about 400 m outside Hannants Bight on a line toward large bluff of Ocean Beach, Tasmania, Australia (42°11.4’S 145°11.08'E), 30 m depth. Etymology. Named for the Macquarie Harbour pilot boat that put out on 23 July 1830 to guide the Government brig Tamar through the difficult harbour entrance known as 'Hells Gates'. When about half-way to the brig conditions deteriorated into a south-westerly gale and the pilot boat, with its nine crew, disappeared. Additional material examined. New South Wales. 2 specimens, AM P.44241; 4 specimens, AM P.44252, off Wollongong (34°31.48’S 151°13.22’E), 200 m, Globigerina ooze, baited trap, 28–29 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-962, NSW-964]; 2 specimens, AM P.44265, off Wollongong (34°31.48’S 151°13.22’E), 200 m, 95.9% sand, 4.9% mud, baited trap, 27–28 March 1994, J.K. Lowry & K. Dempsey, MV Robin E [NSW-944]; 10 specimens, AM P.51107; 6 specimens, AM P.46906, off Wollongong (34°32.02’S 151°13.0’E), 200 m, baited trap, 6–7 May 1993, P. Freewater & party, MV Robin E [NSW-780, NSW-781]; 2 specimens, AM P.47020; 22 specimens, AM P.47034; 10 specimens, AM P.48186, off Wollongong (34°32.08’S 151°12.55’E), 200 m, baited trap, 7–8 May 1993, P. Freewater & party, MV Robin E [NSW-797, NSW-798]; 10 specimens, AM P.44428; 1 specimens, AM P.44439, off Wollongong (34°32.38’S 151°15.0’E), 300 m, Globigerina ooze, baited trap, 7–8 May 1993, P. Freewater, S.J. Keable & W. Vader, MV Robin E [NSW-801, NSW-802]; 1 specimen, AM P.44455, off Wollongong (34°32.25’S 151°15.17’E), 300 m, Globigerina ooze, baited trap, 6–7 May 1993, P. Freewater & party, MV Robin E [NSW-783]; 3 specimens, AM P.48395, off Wollongong (34°26.42’S 150°58.03’E), 50 m, baited trap, 7–8 May 1993, P. Freewater & party, MV Robin E [NSW-792]; 26 specimens, AM P.48196, north-east of Coffs Harbour (30°15.93’S 153°21.9’E), 100 m, baited trap, 8–9 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-984]; 17 specimens, AM P.48423; 1 specimen, AM P.48411, north-east of Coffs Harbour (30°15.93’S 153°21.9’E), 100 m, baited trap, 9–10 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-1006, NSW-1007]; 14 specimens, AM P.55967, north-east of Coffs Harbour (30°15.93’S 153°21.9’E), 92.7 m, baited trap, 11–12 August 1993, P.B. Berents & R. T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-870]; 85 specimens, AM P.55978; 3 specimens, AM P.57648; 2 specimens, AM P.69459; 5 specimens, AM P.52649, north-east of Coffs Harbour (30°15.75’S 153°21.98’E), 98 m, baited trap, 12–13 August 1993, P.B. Berents & R. T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-885–NSW-887]; 55 specimens, AM P.58467, north-east of Coffs Harbour (30°14.63’S 153°27.68’E), 199 m, baited trap, 12–13 August 1993, P.B. Berents & R. T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-884]; 1 specimen, AM P.69458, east of Long Reef (33°43'S 151°46'E to 33°44'S 151°46'E), 174 m, epibenthic sled, 20 December 1985, J.K. Lowry & R. T. Springthorpe, FRV Kapala [K85-21-08]. Queensland. many specimens, AM P.69460, east of Fitzroy Reef (23°26.16’S 152°28.46’E), 400 m, baited trap, 16–17 June 1993, J.K. Lowry, P. Freewater & R. T. Springthorpe, MV Reefknot [QLD-963/ SEAS]. Tasmania. 1 specimen, AM P.50826, east of Fortescue Bay, north of Hippolyte Rocks (43°06.7’ S 148°03.45’E), 100 m, baited trap, 16–17 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-354]; 1 specimen, AM P.51321, east of Fortescue Bay, north of Hippolyte Rocks (43°06.7’ S 148°03.45’E), 100 m, baited trap, 9–10 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan [TAS-409]; many specimens, AM P.69455, north side of Cape Sorell, about 80 m outside Hannants Bight (42°11.5’S 145°11.0’E), 18 m, sand and detritus, baited trap, 26–27 April 1991, J.K. Lowry & S.J. Keable, Flying Scud [TAS-277]; 2 specimens, AM P.69456, D'Entrecasteaux Channel, north end of Tower Bay, 400 m off small shingle beach (43°23.6’S 147°02.4’E), 40 m, baited trap, 20–21 April 1991, J.K. Lowry & S.J. Keable, Flying Scud [TAS-222]; 1 specimen, AM P.69457, east of Fortescue Bay, north of Hippolyte Rocks (43°06.7’S 148°03.45’E), 100 m, baited trap, 8–9 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan [TAS-390]. Description. Based on holotype, female, 12.0 mm, AM P.69452. Head, lateral cephalic lobes small, subtriangular, apically subacute. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum not forming cap, terminal article not offset; primary flagellum with strong 2-field callynophore; robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged; flagellum short; calceoli absent. Labrum, epistome and upper lip separate; epistome less produced than upper lip, straight; upper lip produced, acute apically. Mandible incisor large, left and right symmetrical; molar with asymmetrically reduced column, proximally setose, distally triturating; article 2 margins subparallel. Maxilla 1 outer plate setaltooth 7 present, left and right symmetrical, cuspidate distally along inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 5 long apical robust setae, medial margins crenulated. Gnathopod 1 weakly subchelate; coxa large, about as long as coxa 2, distally subovate; basis densely setose along anterior margin; ischium long (length 2 × to 4 × breadth); carpus long (length 2 to 4 × breadth), longer than propodus, without posterior lobe; propodus margins subparallel, palm slightly to moderately acute, entire, straight; dactylus simple, with large subapical spine. Gnathopod 2 propodus palm slightly obtuse; dactylus fitting palm. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa without distinct lateral ridge; basis about as long as broad or longer than broad, posterior margin weakly serrate. Pereopod 7 basis posterodistally produced less than halfway along merus. Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner acutely produced, with tiny basal notch and weak spine. Urosomite 1 not projecting over urosomite 2, with rounded boss. Uropod 2 inner ramus without constriction. Uropod 3 peduncle without dorsolateral flange; outer ramus article 2 short, with plumose setae on both rami. Telson deeply cleft, without dorsal robust setae, with 2–3 apical robust setae on each lobe. Depth range. 18–400 m. Remarks. See remarks under Parschisturella medora. Distribution. Australia. New South Wales: north-east of Coffs Harbour; east of Long Reef; off Wollongong. Queensland: east of Fitzroy Reef. Tasmania: east of Fortescue Bay; D'Entrecasteaux Channel; north of Hippolyte Rocks; north side of Cape Sorell., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 57-61, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734

Euonyx urania sp. nov. (Figs 10–12) Types. Holotype, female, 19.0 mm, AM P.68881, east of Broken Bay, New South Wales, Australia (33°35.0’S 152°05.0’E to 37°37.0’S 152°05.0’E), 1144 m, dredge 10 December 1980, FRV Kapala [K80-20-10]. Type locality. East of Broken Bay, New South Wales, Australia (33°35.0’S 152°05.0’E to 37°37.0’S 152°05.0’E), 1144 m depth. Etymology. Named for the sailing vessel Urania lost off the central New South Wales coast in December 1876; used as a noun in apposition. Description. Based on holotype, female, 19.0 mm. Head, lateral cephalic lobe subtriangular, apically acute and slightly upturned; eyes apparently absent. Antenna 1 peduncular article 1 with well-developed anterodistally rounded lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore, 6-articulate, terminal article not offset; primary flagellum with strong 2-field callynophore; robust setae present on proximal articles; calceoli absent. Antenna 2 peduncle articles 3 to 5 not enlarged, brush setae absent; flagellum long; calceoli absent. Labrum, epistome and upper lip separate; epistome less produced than upper lip, slightly concave; upper lip produced, downward-pointing and acute apically. Mandible incisor small, left and right slightly asymmetrical; molar absent; palp attached about midway, article 2 with central bulge. Maxilla 1 outer plate setal-tooth 7 present, not cuspidate; palp distal margin with apical robust setae. Maxilla 2 inner plate significantly shorter than outer plate. Maxilliped outer plate apical robust setae absent (with 3 subapical robust setae along inner margin). Gnathopod 1 chelate; coxa vestigial, significantly shorter than coxa 2, subquadrate; basis sparsely setose along anterior margin; ischium very long (length 4 × to 6 × breadth); carpus very long (length more than 4 × breadth), longer than propodus, without posterior lobe; propodus margins subparallel, palm obtuse, entire, straight; dactylus simple. Gnathopod 2 propodus palm slightly acute. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 coxa without distinct lateral ridge; basis broader than long, posterior margin weakly or not serrate. Pereopod 7 basis posterodistally produced less than halfway along merus. Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner forming, weak spine. Urosomite 1 not projecting over urosomite 2, with a weakly produced, broadly truncated boss. Uropod 2 inner ramus without constriction. Peduncle without dorsolateral flange; outer ramus article 2 short, without plumose setae on rami. Telson deeply cleft. Sexually dimorphic characters. Unknown. Depth range. 1144 m. Remarks. See remarks under E. chelatus. Distribution. Australia. New South Wales., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 22-25, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734

Abyssorchomene gerulicorbis (Shulenberger & Barnard, 1976) comb. nov. Orchomene affinis.— Birstein & Vinogradov, 1955: 223, fig. 9. Orchomene gerulicorbis Shulenberger & Barnard, 1976: 243, figs 1–3.—Thurston, 1979: 56 (biology).— Barnard & Ingram, 1990: 21.— Barnard & Karaman, 1991: 508. Orchomenella (Orchomenopsis) gerulicorbis.— Palerud & Vader, 1991: 41.— Jones, Collins, Bagley, Addison & Priede (1998): 1124, table 2 (ecology). Orchomenella gerulicorbis.— Thurston, 1990: 262 Table 3, 264 Table 5, etc. (ecology).—Lowry Stoddart, 1994: 181.— Lowry & Stoddart 2003: 169.— Jamieson, Kilgallen, Rowden, Fujii, Lörz, Kitazawa & Priede, 2011: 53, 55, table 3, 58, table 6 (ecology).—Duffy, Horton & Billet, 2012: 4865, table 3 (ecology).— Corrigan, Horton, Fotherby, White & Hoelzel, 2013: 6 (molecular).— Cousins, Horton, Wigham & Bagley, 2013: 303, table 3 (ecology). Types. Holotype, female, 13. 9 mm, USNM 149204. Type locality. 440 miles north of Oahu, Hawaii, (28°00'00"N 155°00'00"W), 5720 m, water temperature, 1.2°C, bottom smooth red mud with Manganese nodules. Australian material examined. Queensland: 22 specimens, AM P.49519; 4 specimens, AM P.49523; 261 specimens, AM P.50232; 270 specimens, AM P.50239; 21 specimens, AM P.50295; 14 specimens, AM P.57597; 3 specimens, AM P.57601; 10 specimens, AM P.57603; 5 specimens, AM P.57610; 2 specimens, AM P.57613; 1 female, AM P.71842; 14 specimens, AM P.71843, east of Flynn Reef, Queensland, Australia (16°37.82'S 146°23.08'E), 1000 m, baited trap, 7–8 June 1993, J.K. Lowry, P. Freewater & W. Vader, RV Sunbird [QLD-930–QLD932 & QLD-948–QLD-950/ SEAS]. Tasmania. 20 specimens, AM P.73704, Hill D 1, south-southeast of South East Cape (44°23.4'S 147°16.2'E), 1942 m, baited trap, 31 January 1997, CSIRO party on FRV Southern Surveyor, FRV Southern Surveyor [SS01 /97/ 65]. Extralimital material examined: 8 specimens, AM P.40544, San Clemente Basin, California, United States of America (32°29.8'N 117°59.0'W), 1860 m, 05 November 1987, S.C. France, RV Robert Gordon Sproul [114]; 22 specimens, AM P.42143, off Rapa, Austral Isles, French Polynesia, (27°35.3' S 144°15.5'W), 870 m, baited trap, 17 August 1991, J.K. Lowry & J.M. Poupin, RV Marara [FRP-55]; 48 specimens, AM P.42144; 4 specimens, AM P.42145, off Rapa, Austral Isles, French Polynesia, (27°35.5' S 144°15.8'W), 750 m, baited trap, 18 August 1991, J.K. Lowry & J.M. Poupin, RV Marara [FRP-64 & FRP-66]. Diagnostic description. Mandible molar setose with a triturating surface. Maxilla 2 inner plate slightly shorter than outer plate. Gnathopod 1 subchelate; coxa 1 large, about as long as coxa 2, subrectangular, anterior margin nearly straight; ischium not enlarged; propodus margins subparallel; palm transverse, slightly convex. Gnathopod 2 chelate; palm obtuse, margin excavate; dactylus with ‘setal basket’ on posterodistal margin. Pereopod 7 basis tapering distally. Epimeron 3 posteroventral corner narrowly rounded . Telson moderately cleft. Remarks. Abyssorchomene gerulicorbis has a subrectangular first coxa with a nearly straight anterior margin similar to A. abyssorum and A. charcoti. Abyssorchomene gerulicorbis and A. abyssorum have subchelate first gnathopods (parachelate in A. charcoti). It is difficult to separate A. gerulicorbis from A. abyssorum and A. scotianensis. Abyssorchomene gerulicorbis and A. abyssorum both have subrectangular first coxae (subtly adzeshaped in A. scotianensis). The inner plate of maxilla 2 is significantly shorter than the outer plate in the A. abyssorum of Barnard & Ingram (1990), but not in the specimen of Stebbing (1888) or to a less extent the specimen of Birstein & Vinogradov (1990). The adze-shaped first coxa separated A. scotianensis separates form these two species but in other characters they are extremely similar. Abyssorchomene gerulicorbis differs from A. chevreuxi mainly in the upper lip which is slightly produced and apically narrowly rounded (upper lip not produced in A. chevreuxi) and in A. gerulicorbis the dactylus of gnathopod 1 has a posterodistal ‘setal basket’ (absent in A. chevreuxi). Distribution. North Atlantic Ocean: Porcupine, Iberian, Madeira, Cape Verde, and Guiana Abyssal Plains (Thurston 1990). North Pacific Ocean: Kuril-Kamchatka (Birstein & Vinogradov 1955); north of Hawaii (Shulenberger & Barnard 1976). South Pacific Ocean: Austral Isles (Lowry & Stoddart 1994); Kermadec Trench (Jamieson et al. 2011); east coast of Australia (this study). Indian Ocean: Crozet Plateau (Cousins et al. 2013)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 9-10, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Shulenberger, E. & Barnard, J. L. (1976) Amphipods from an abyssal trap set in the North Pacific gyre. Crustaceana, 31, 241 - 258. http: // dx. doi. org / 10.1163 / 156854076 x 00035","Birstein, J. A. & Vinogradov, M. E. (1955) Pelagicheskie gammaridy (Amphipoda Gammaridea) Kurilo-Kamchatskoi Vpadiny. Akademiya Nauk SSSR, Trudy Instituta Okeanologii, 12, 210 - 287, 35 figs.","Barnard, J. L. & Ingram, C. (1990) Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology, 499, 1 - 80. http: // dx. doi. org / 10.5479 / si. 00810282.499","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Palerud, R. & Vader, W. (1991) Marine Amphipoda Gammaridea in north-east Atlantic and Norwegian Arctic. Tromura, Naturvitenskap, 68, 1 - 97.","Jones, E. M., Collins, M. A., Bagley, P. M., Addison, S. & Priede, I. G. (1998) The fate of cetacean carcasses in the deep sea: observations on consumption rates and succession of scavenging Species in the abyssal north-east Atlantic Ocean. Proceedings of the Royal Society of London B, 265 (1401), 1119 - 1127. http: // dx. doi. org / 10.1098 / rspb. 1998.0407","Thurston, M. H. (1990) Abyssal necrophagous amphipods (Crustacea: Amphipoda) in the northeast and tropical Atlantic Ocean. Progress in Oceanography, 24, 257 - 274. http: // dx. doi. org / 10.1016 / 0079 - 6611 (90) 90036 - 2","Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. Vol. 19.2 B. CSIRO Publishing, Melbourne, 531 pp.","Jamieson, A. J., Kilgallen, N. M., Rowden, A. A., Fujii, T., Lorz, A. - N., Kitazawa, K. & Priede, I. G. (2011) Bait-attending fauna of the Kermadec Trench, SW Pacific Ocean: Evidence for an ecotone across the abyssal - hadal transition zone. Deep-Sea Research I, 58 (2011), 49 - 62. http: // dx. doi. org / 10.1016 / j. dsr. 2010.11.003","Corrigan, L., Horton, T., Fotherby, H., White, T. A. & Hoelzel, A. R. (2013) Adaptive Evolution of Deep-Sea Amphipods from the Superfamily Lysianassoidea in the North Atlantic. Evolutionary Biology, 41 (1), 154 - 165.","Cousins, N. J., Horton, T., Wigham, B. D. & Bagley, P. M. (2013) Abyssal scavenging demersal fauna at two areas of contrasting productivity on the Subantarctic Crozet Plateau, southern Indian Ocean. African Journal of Marine Science, 35 (2), 299 - 306. http: // dx. doi. org / 10.2989 / 1814232 x. 2013.802747","Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology, 29, 1 - 1737, pls. 1731 - 1210.","Lowry, J. K. & Stoddart, H. E. (1994) Crustacea Amphipoda, Lysianassoids from the tropical western South Pacific Ocean. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM. Vol. 12. Memoires de Museum National d'Histoire Naturelle, 161, 127 - 223."]}

Stephonyx normani (Stebbing, 1888) Euonyx normani Stebbing, 1888: 669, pl. 19.— Della Valle, 1893: 842.— Stebbing, 1906: 19.— Pirlot, 1933: 120 (key).—J.L. Barnard, 1958: 92.— Thurston & Allen, 1969: 358.— Mills, 1972: 76 (table 1).— Barnard & Ingram, 1990: 2 (key).— Barnard & Karaman, 1991: 485. Stephonyx normani.— Lowry & Stoddart, 1989: 521.— Diffenthal & Horton, 2007: 39 (key).— Senna & Serejo, 2007: 13 (key).— Narahara et al., 2012: 1505 (key). not Euonyx normani.— Chilton, 1921: 52, figs 5a-d.— Pirlot, 1933: 120 (key).— Sheard, 1937: 19. (= S. pirloti). Types. Holotype female, BMNH 1889: 5: 15: 21 (specimen in alcohol + 8 slides). Type locality. Near the Kermadec Islands (29°45'S 178°11'W), 1152 m depth. Habitat. Marine, volcanic mud. Depth range. 1152 m (Stebbing 1888). Feeding strategies. Unreported. Distribution. Pacific Ocean. Kermadec Islands (Stebbing 1888)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 68, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology, 29, 1 - 1737, pls. 1731 - 1210.","Della Valle, A. (1893) Gammarini del Golfo di Napoli. Fauna und Flora des Golfes von Neapel, 20, 1 - 948, pls. 941 - 961. http: // dx. doi. org / 10.5962 / bhl. title. 3710","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Pirlot, J. M. (1933) Les amphipodes de l'expedition du Siboga. Deuxieme partie: Les amphipodes gammarides, II: - Les amphipodes de la mer profonde. 1. (Lysianassidae, Stegocephalidae, Stenothoidae, Pleustidae, Lepechinellidae). Siboga- Expeditie, Monographie, 33 c, 114 - 167.","Barnard, J. L. (1958) Index to the families, genera, and species of the gammaridean Amphipoda (Crustacea). Allan Hancock Foundation Publications, Occasional Paper, 19, 1 - 145.","Thurston, M. H. & Allen, E. (1969) Type material of the families Lysianassidae, Stegocephalidae, Ampeliscidae and Haustoriidae (Crustacea: Amphipoda) in the collections of the British Museum (Natural History). Bulletin of the British Museum (Natural History), Series Zoology, 17, 347 - 388.","Mills, E. L. (1972) T. R. R. Stebbing, the ' Challenger' and knowledge of deep-sea Amphipoda. Proceedings of the Royal Society of Edinburgh, Series B, 72, 69 - 87. http: // dx. doi. org / 10.1017 / s 0080455 x 00001624","Barnard, J. L. & Ingram, C. (1990) Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology, 499, 1 - 80. http: // dx. doi. org / 10.5479 / si. 00810282.499","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. http: // dx. doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598","Chilton, C. (1921) Report on the Amphipoda obtained by the F. I. S. \" Endeavour \" in Australian seas. Biological Results of the Fishing Experiments carried on by the F. I. S. \" Endeavour \", 1909 - 14, 5, 33 - 92.","Sheard, K. (1937) A catalogue of Australian Gammaridea. Transactions and Proceedings of the Royal Society of South Australia, 61, 17 - 29."]}

Stephonyx perexcavatus Narahara, Tomikawa & Torigoe, 2012 Stephonyx perexcavatus Narahara, Tomikawa & Torigoe, 2012: 1479, 1505 (key), figs 2–6. Types. Holotype male, 22.9 mm, NSMT-Cr 22011. Paratypes: four males (20.4–22.9 mm) NSMT-Cr 22012–22015; five females (21.9–23.2 mm) NSMT-Cr 22016–22020. Type locality. Okinawa Trough, East China Sea (28°29.5'N, 127°59.2'E), 1073–1080 m. Habitat. Marine, benthic. Depth range. 1073–1080 m (Narahara et al. 2012). Feeding strategies. Scavenger taken in baited trap. Distribution. Pacific Ocean. Okinawa Trough, East China Sea (Narahara et al. 2012)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 68, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598"]}

Uristes Dana, 1849 (Fig. 49, 50) Uristes Dana, 1849: 136.— Dana, 1852: 209.— Dana, 1853: 917.— Bate, 1862: 89.— Stebbing, 1906: 63.— Stephensen, 1929: 64.—J.L. Barnard, 1962: 35.— Hurley, 1963: 91.—J.L. Barnard, 1969: 367.— Ledoyer, 1986: 816.— Barnard & Karaman, 1991: 538.— Lowry & Stoddart, 2003: 284 (catalogue). Uristoides Schellenberg, 1931: 27.— Barnard & Karaman, 1991: 539 (in part). Type species. Uristes gigas Dana, 1852, monotypy. Included species. Uristes contains 2 species: U. gigas Dana, 1849; U. subchelatus (Schellenberg, 1931). Incertae sedis. Uristes abyssi (Norman, 1900) (family unknown); U. albinus (K.H. Barnard, 1932) (family unknown); U. dawsoni Hurley, 1963 (family unknown); U. entalladurus J.L. Barnard, 1963 (Lysianassidae, Tryphosinae); U. georgianus (Schellenberg, 1931) (family unknown); U. natalensis K.H. Barnard, 1916 (family unknown); U. paramoi (Schellenberg, 1931). Removals. Uristes perspinis J.L. Barnard, 1967 to the tryphosine genus Cedrosella Barnard & Karaman, 1987 based on gnathopod 1 with a tapering first coxa and a short carpus, a non-constricted inner ramus on uropod 2 and a moderately cleft telson. Uristes abyssalis (Stephensen, 1925) is tentatively removed to the tryphosine genus Gronella Barnard & Karaman, 1991, based on mandible molar triturating, gnathopod 1 coxa is slightly tapering, carpus short, propodus margins subparallel and the telson moderately cleft. The condition of the male antenna 2 peduncle (with or without brush setae) and the condition of the inner ramus of uropod 2 (constricted or not) needs to be verified to confirm the generic placement. Uristes barbatipes (Stebbing, 1888) is removed the tryphosine genus Tasmanosa Lowry & Kilgallen, 2014 based on the well-developed antenna 1 accessory flagellum and the triturating molar, maxilla 2 inner plate slightly shorter than outer, the distinctive carpus and propodus of gnathopod 1. Uristes serratus Schellenberg, 1931 and U. yamana Chiesa & Alonso de Pina, 2007 appear to be congeneric, and belong to a yet to be described genus in the Uristidae based on the absence of a callynophore in the female and apparently in the male, the compressed carpus of gnathopod 1 and the cleft telson. Uristes adarei (Walker, 1903); U. antennibrevis J.L. Barnard, 1962; U. californicus Hurley, 1963; U. mediator J.L. Barnard, 1962; U. stebbingi (Walker, 1903); U. sulcus Griffiths, 1974 are removed to the tryphosine genus Tryphosella Bonnier, 1893 based on the triturating molar, maxilla 1 with a 6/5 setal-tooth arrangement, the tapering coxa of gnathopod 1. Uristes velia J.L. Barnard, 1961 is removed to the tryphosine genus Cheirimedon Stebbing, 1888 based on the maxilla 1 setal-tooth arrangement; gnathopod 1 carpus short and propodus margins subparallel; pereopod 4 with weak posteroventral lobe; and telson deeply cleft. Diagnostic description. [based on type species] Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum not forming cap covering callynophore or flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 without brush setae. Mandible molar ridge-like, narrow, setose with narrow distal triturating surface. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate slightly shorter than outer plate. Gnathopod 1 subchelate; coxa 1 large, about as long as coxa 2, subrectangular with straight anterior margin or distally subovate; ischium short (length less than 2 × breadth); carpus short (length 1 to 2 × breadth) to long (length 2 to 4 × breadth); propodus margins subparallel or slightly tapering. Uropod 2 inner ramus not constricted. Telson deeply cleft. Remarks. As Chisea & Alonso (2007) point out Uristes is in need of revision. The diagnosis provided here is based on the type species. Of the 23 species currently assigned to Uristes, only two remain. Eight of these species are so poorly described that they cannot be placed. Based on the subchelate first gnathopod with a large coxa with a straight anterior margin and a short carpus Uristes appears to be most similar to the Arctic/boreal genera Anonyx and Onisimus. It differs from both in having a ridge-like narrow setose molar with a distal triturating surface and in not having an accessory flagellum cap. Distribution. Southern Ocean and southern Australian waters., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 80-83, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Dana, J. D. (1849) Synopsis of the genera of Gammaracea. American Journal of Sciences and Arts, Series 2, 8, 135 - 140.","Dana, J. D. (1852) Conspectus crustaceorum quae in orbis terrarum circumnavigatione, CAROLO WILKES e classe Reipublicae Faederatae Duce, lexit et descripsit JACOBUS D. DANA. Pars III. [Amphipoda. No. I.]. Proceedings of the American Academy of Arts and Sciences, 2, 201 - 220.","Dana, J. D. (1853) Crustacea. Part II. United States Exploring Expedition, 14, 689 - 1618, atlas of 96 pls.","Bate, C. Spence (1862) Catalogue of the specimens of Amphipodous Crustacea in the collection of the British Museum. Printed by order of the Trustees [by Taylor and Francis], London, 399 pp. http: // dx. doi. org / 10.5962 / bhl. title. 20901","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Stephensen, K. (1929) Amphipoda. Die Tierwelt der Nord- und Ostsee, 14, 1 - 188.","Barnard, J. L. (1962) South Atlantic abyssal amphipods collected by R. V. Vema. Abyssal Crustacea. Vema Research Series, 1, 1 - 78.","Hurley, D. E. (1963) Amphipoda of the family Lysianassidae from the west coast of North and Central America. Allan Hancock Foundation Publications, Occasional Paper, 25, 1 - 160.","Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535. http: // dx. doi. org / 10.1163 / 156854082 x 00632","Ledoyer, M. (1986) Crustaces Amphipodes Gammariens. Familles des Haustoriidae a Vitjazianidae. Faune de Madagascar, 59, 599 - 1112.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. Vol. 19.2 B. CSIRO Publishing, Melbourne, 531 pp.","Schellenberg, A. (1931) Gammariden und Caprelliden des Magellangebietes, Sudgeorgiens und der Westantarktis. Further Zoological Results of the Swedish Antarctic Expedition 1901 - 1903, 2, 1 - 290, pl. 291.","Norman, A. M. (1900) British Amphipoda: Fam. Lysianassidae (concluded). Annals and Magazine of Natural History, Series 7, 5, 196 - 214, pls. 196. http: // dx. doi. org / 10.1080 / 00222930008678268","Barnard, K. H. (1932) Amphipoda. Discovery Reports, 5, 1 - 326, pls. 321.","Barnard, J. L. (1963) Los anfipodos bentonicos ' marinos de la. costa occidental de Baja California. Revista de la Sociedad Mexicana de Historia Natural, 24, 205 - 273.","Barnard, K. H. (1916) Contributions to the crustacean fauna of South Africa. 5. - The Amphipoda. Annals of the South African Museum, 15, 105 - 302, pls. 126 - 128.","Barnard, J. L. (1967) Bathyal and abyssal gammaridean Amphipoda of Cedros Trench, Baja California. Bulletin of the United States National Museum, 260, 1 - 205. http: // dx. doi. org / 10.5479 / si. 03629236.260.1","Barnard, J. L. & Karaman, G. S. (1987) Revisions in classification of gammaridean Amphipoda (Crustacea), Part 3. Proceedings of the Biological Society of Washington, 100, 856 - 875.","Stephensen, K. (1925) Crustacea Malacostraca, VI: (Amphipoda, II). Danish Ingolf-Expedition, 3, 101 - 178.","Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology, 29, 1 - 1737, pls. 1731 - 1210.","Lowry, J. K. & Kilgallen, N. M. (2014) New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassidae, Tryphosinae). Zootaxa, 3844 (1), 1 - 64. http: // dx. doi. org / 10.11646 / zootaxa. 3844.1.1","Walker, A. O. (1903) Amphipoda of the ' Southern Cross' Antarctic Expedition. Journal of the Linnean Society of London, Zoology, 29 (187), 38 - 64, pls. 37 - 11.","Griffiths, C. L. (1974) The Amphipoda of southern Africa. Part 4. The Gammaridea and Caprellidea of the Cape Province east of Cape Agulhas. Annals of the South African Museum, 65, 251 - 336.","Bonnier, J. (1893) Les amphipodes du Boulonnais (1). Bulletin Scientifique de la France et de la Belgique, 24, 161 - 207, pls. 5 - 8.","Barnard, J. L. (1961) Gammaridean Amphipoda from depths of 400 to 6000 meters. Galathea Report, 5, 23 - 128."]}

Euonyx Norman, 1867 (Fig. 9) Euonyx Norman, 1867: 202.— Sars, 1891: 116.— Stebbing, 1906: 19 (in part). Pirlot, 1936: 116 (in part).—J.L. Barnard, 1969: 342 (in part).— Lincoln, 1979: 54 (in part).— Lowry & Stoddart, 1989: 519.— Barnard & Karaman, 1991: 485, fig. 92I (in part). Leptochela Boeck, 1876: 190 (homonym, Decapoda) (type species, Opis leptochela Bate & Westwood, 1868, monotypy. Type species. Euonyx chelatus Norman, 1867, monotypy. Included species. Euonyx includes four species: E. chelatus Norman, 1867; E. coecus Pirlot, 1933 E. urania sp. nov.; E. xarifa sp. nov. Incertae sedis. Euonyx conicurus K.H. Barnard, 1955 (genus uncertain); Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 without brush setae. Mandible molar a large, asetose flap or absent. Maxilla 1 outer plate with reduced seta-teeth in a modified 7/4 crown. Maxilla 2 inner plate subequal to or significantly shorter than outer plate. Gnathopod 1 chelate; coxa 1 reduced, significantly shorter than coxa 2, tapering distally or subquadrate; ischium long (length 2 × to 4 × breadth) too very long (length 4 × to 6 × breadth) ; carpus long (length 2 to 4 × breadth); propodus margins subparallel. Uropod 2 inner ramus not constricted. Telson deeply cleft. Remarks. Euonyx appears to be the immediate sister taxon of Stephonyx Lowry & Stoddart, 1989. Euonyx has abandoned the scavenging life-style to become an ectoparasite of echinoids and in the process developed severely reduced mouthparts, particularly the seta-teeth of the maxilla 1 outer plate. In Euonyx coecus Pirlot, 1933 the setal-teeth of maxilla 1 appear to be intermediate between Euonyx and Stephonyx, but the mandibular molar is absent, an important characteristic of Euonyx. Distribution. North Atlantic Ocean. Indonesia. Eastern Australia. Key to Euonyx species 1. Antenna 1 peduncular article 1 without anterodistal lobe................................................ E. xarifa - Antenna 1 pedunculararticle 1 withsmalltolargeanterodistallobe............................................ 2 2. Gnathopod 1 carpus longer than propodus........................................................... E. urania - Gnathopod 1 carpusshorterthanorsubequaltopropodus.................................................... 3 3. Urosomite 1 dorsal margin a broad angled wedge................................................... E. chelatus - Urosomite 1 dorsalmarginanacutetriangularprocess.........................................? Euonyxconicurus - Urosomite 1 dorsalmarginaroundedboss..................................................... Euonyxcoecus, Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 18, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Norman, A. M. (1867) Report of the committee appointed for the purpose of exploring the coasts of the Hebrides by means of the dredge. Part II. On the Crustacea, Echinodermata, Polyzoa, Actinozoa, and Hydrozoa. Report of the British Association for the Advancement of Science, 36, 193 - 206.","Sars, G. O. (1891) An Account of the Crustacea of Norway, with Short Descriptions and Figures of all the Species. Vol. I. Amphipoda. Parts 4 - 9. Alb. Cammermeyer, Christiana, 144 pp., 48 pls. [pp. 69 - 212, pls. 225 - 272]","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Pirlot, J. M. (1936) Les amphipodes de l'expedition du Siboga. Deuxieme partie: Les amphipodes gammarides, II. - Les amphipodes de la mer profonde. 3: Addendum et partie generale. III. - Les amphipodes littoraux. 1: Lysianassidae, Ampeliscidae, Leucothoidae, Stenothoidae, Phliantidae, Colomastigidae, Ochlesidae, Liljeborgiidae, Oedicerotidae, Synopiidae, Eusiridae, Gammaridae. Siboga-Expeditie, Monographie, 33 e, 237 - 328.","Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535. http: // dx. doi. org / 10.1163 / 156854082 x 00632","Lincoln, R. J. (1979) British Marine Amphipoda: Gammaridea. British Museum (Natural History), London, v + 658 pp.","Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. http: // dx. doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Boeck, A. (1876) De Skandinaviske og Arktiske Amphipoder. Part 2. A. W. Brogger, Christiania, pp. 1 - 713, pls. 168 - 132. http: // dx. doi. org / 10.5962 / bhl. title. 10131","Bate, C. S. & Westwood, J. O. (1868) A History of the British Sessile-eyed Crustacea. John Van Voorst, London, 536 pp.","Pirlot, J. M. (1933) Les amphipodes de l'expedition du Siboga. Deuxieme partie: Les amphipodes gammarides, II: - Les amphipodes de la mer profonde. 1. (Lysianassidae, Stegocephalidae, Stenothoidae, Pleustidae, Lepechinellidae). Siboga- Expeditie, Monographie, 33 c, 114 - 167.","Barnard, K. H. (1955) Additions to the fauna-list of South African Crustacea and Pycnogonida. Annals of the South African Museum, 43, 1 - 107."]}

Anonyx Krøyer, 1838a (Fig. 2) Anonyx Krøyer, 1838a: 256.— Krøyer, 1838b: 243.— Stebbing, 1906: 53.— Gurjanova, 1962: 207 (key).— Steele & Brunel, 1968: 949 (key).—J.L. Barnard, 1969: 324.— Lincoln, 1979: 76.— Barnard & Karaman, 1991: 442 (key), 463. Chironesimus Sars, 1891: 108 (type species, Anonyx debruynii Hoek, 1882, monotypy). Lakota Holmes, 1908: 498 (type species, Lakota carinata Holmes, 1908, original designation). Type species. Lysianassa lagena Krøyer, 1838b, selected by Boeck, 1876 (junior synonym of A. nugax (Phipps, 1774)). Included species. Anonyx includes 50 species: A. abei Takekawa & Ishimaru, 2001; A. adoxus Hurley, 1963; A. affinis Ohlin, 1895; A. attenuatus Steele, 1989; A. barrowensis Steele, 1982; A. beringi Steele, 1982; A. birulai Gurjanova, 1962; A. bispinosus Steele, 1967; A. comecrudus J.L. Barnard, 1971; A. compactus Gurjanova, 1962; A. dalli Steele, 1983; A. debruynii Hoek, 1882; A. eous Gurjanova, 1962; A. eousides Steele, 1991; A. epistomicus Kudrjaschov, 1965; A. grebnitzkii Steele, 1991; A. gurjanovai Steele, 1986; A. hayashii Sekiguchi & Yamaguchi, 1983; A. hurleyi Steele, 1986; A. knipowitschi Gurjanova, 1962; A. laticoxae Gurjanova, 1962; A. lilljeborgi Boeck, 1871; A. makarovi Gurjanova,1962; A. minimus Gurjanova, 1962; A. multiarticulatus (Pearse, 1913); A. nugax (Phipps, 1774); A. ochoticus Gurjanova, 1962; A. oculatus Gurjanova, 1962; A. omorii Takekawa & Ishimaru, 2001; A. orientalis Gurjanova, 1962; A. pacificus Gurjanova, 1962; A. pareous Steele, 1991; A. pavlovskii Gurjanova, 1962; A. petersoni Steele, 1986; A. pseudeous Steele, 1991; A. robustus Gurjanova, 1962; A. sarsi Steele & Brunel, 1968; A. schefferi Steele, 1986; A. schokalsii Gurjanova, 1962; A. sculptifer Gurjanova, 1962; A. shoemakeri Steele, 1983; A. simplex Hirayama, 1985; A. stappersi Steele, 1989; A. stebbingi Steele, 1989; A. stegnegeri Steele, 1986; A. validus Gurjanova, 1962; A. volkovi Kudrjaschov, 1965. Incertae sedis. Anonyx anivae Gurjanova, 1962 (gnathopod 1 propodus margins subparallel, antenna 2 without brush setae, mouthparts unknown); A. derjugini Gurjanova, 1962 (accessory flagellum not forming a cap); Anonyx lebedi Gurjanova, 1962 (gnathopod 1 ischium long); Anonyx magnus Gurjanova, 1962 (gnathopod 1 very weakly subchelate and no constriction on uropod 2 inner ramus). Removals. Anonyx lebedi Gurjanova, 1962 to Tmetonyx. Gnathopod 1 with long ischium and propodus with subparallel margins. Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum forming cap covering callynophore. Antenna 2 with brush setae . Mandible molar setose with vestigial triturating surface. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate slightly to significantly shorter than outer plate. Gnathopod 1 subchelate (occasionally parachelate); coxa 1 large, about as long as coxa 2, subrectangular with straight or concave anterior margin; ischium short (length less than 2 × breadth); carpus short (length 1 to 2 × breadth) or long; propodus margins slightly tapering distally. Uropod 2 inner ramus constricted (weak to strong). Telson moderately to deeply cleft. Remarks. Anonyx appears to be most similar to Onisimus. Both genera have a subchelate first gnathopod with a short carpus. However Anonyx has bush setae on antenna 2 (absent in Onisimus) and the molar is a strong setose tongue (a reduced column with triturating surface in Onisimus). Both genera are scavengers with wide-spread distributions in arctic/boreal regions. Anonyx is also similar to Tmetonyx. They differ in the accessory flagellum cap (absent in Tmetonyx), the mandibular molar (setose with a reduced column with convex triturating surface in Tmetonyx), the ischium of gnathopod 1 (long in Tmetonyx), and the margins of the propodus (subparallel in Tmetonyx)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 10, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Kroyer, H. N. (1838 a) Conspectus crustaceorum Groenlandiae. Naturhistorisk Tidsskrift, 2, 249 - 261.","Kroyer, H. N. (1838 b) Gronlands amfipoder beskrevne af Henrik Kroyer. (Som Tellaeg; Beskrivelse af nogle andre gronlandske Draebsdyr, og Optaelling af Draebsdyrklassens hidtil bekjendte gronlandske Arter, i Forbindelse med nogle zoologiskgeografiske ... boreale Krustaceer). Det Kongelige Danske Videnskabernes Selskabs naturvidensdabelige og mathematiske Afhandlinger, Kjobenhavn 4, 7, 229 - 326, pls. 221 - 224.","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Gurjanova, E. F. (1962) Amphipods of the northern part of the Pacific Ocean (Amphipoda-Gammaridea). Part 1. Akademiya Nauk SSSR, Opredeliteli po Faune SSSR, 74, 1 - 440.","Steele, D. H. & Brunel, P. (1968) Amphipoda of the Atlantic and Arctic coasts of North America: Anonyx (Lysianassidae). Journal of the Fisheries Research Board of Canada, 25, 943 - 1060. http: // dx. doi. org / 10.1139 / f 68 - 087","Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535. http: // dx. doi. org / 10.1163 / 156854082 x 00632","Lincoln, R. J. (1979) British Marine Amphipoda: Gammaridea. British Museum (Natural History), London, v + 658 pp.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Sars, G. O. (1891) An Account of the Crustacea of Norway, with Short Descriptions and Figures of all the Species. Vol. I. Amphipoda. Parts 4 - 9. Alb. Cammermeyer, Christiana, 144 pp., 48 pls. [pp. 69 - 212, pls. 225 - 272]","Hoek, P. P. C. (1882) Die Crustaceen, gesammelt wahrend des Fahrten des \" Willem Barents \" in den Jahren 1878 und 1879. Niederlandisches Archiv fur Zoologie, 1 (Supplement), 1 - 75, 73 pls.","Holmes, S. J. (1908) The Amphipoda collected by the U. S. Bureau of Fisheries steamer \" Albatross \" off the west coast of North America, in 1903 and 1904, with descriptions of a new family and several new genera and species. Proceedings of the United States National Museum, 35, 489 - 543. http: // dx. doi. org / 10.5479 / si. 00963801.35 - 1654.489","Boeck, A. (1876) De Skandinaviske og Arktiske Amphipoder. Part 2. A. W. Brogger, Christiania, pp. 1 - 713, pls. 168 - 132. http: // dx. doi. org / 10.5962 / bhl. title. 10131","Phipps, C. J. (1774) Appendix: natural history. In: Phipps, C. J. (Ed.), A Voyage towards the North Pole, undertaken by His Majesty's Command, 1773. J. Nourse, London, pp. 191 - 193.","Takekawa, A. & Ishimaru, S. (2001) Two new species of the genus Anonyx (Amphipoda: Gammaridea: Lysianassoidea) from Onagawa Bay, northeastern Japan. Zoological Science, 18, 405 - 416. http: // dx. doi. org / 10.2108 / zsj. 18.405","Hurley, D. E. (1963) Amphipoda of the family Lysianassidae from the west coast of North and Central America. Allan Hancock Foundation Publications, Occasional Paper, 25, 1 - 160.","Ohlin, A. (1895) Bidrag till kannedomen om Malakostrakfaunan i Baffin Bay och Smith Sound. Acta Universitatis Lundensis, 31, i - xxii, 1 - 70, plates 1 - 71, maps 1 - 71.","Steele, D. H. (1989) The genus Anonyx (Crustacea, Amphipoda) in the North Pacific and Arctic Oceans: Anonyx compactus group. Canadian Journal of Zoology, 67, 1945 - 1954. http: // dx. doi. org / 10.1139 / z 89 - 278","Steele, D. H. (1982) The genus Anonyx (Crustacea, Amphipoda) in the North Pacific and Arctic Oceans: Anonyx nugax group. Canadian Journal of Zoology, 60, 1754 - 1775. http: // dx. doi. org / 10.1139 / z 82 - 228","Steele, D. H. (1967) A new species of the genus Anonyx (Amphipoda) from the Barents Sea. Crustaceana, 13, 257 - 264. http: // dx. doi. org / 10.1163 / 156854067 x 00431","Barnard, J. L. (1971) Gammaridean Amphipoda from a deep-sea transect off Oregon. Smithsonian Contributions to Zoology, 61, 1 - 86. http: // dx. doi. org / 10.5479 / si. 00810282.61","Steele, D. H. (1983) The genus Anonyx (Crustacea, Amphipoda) in the North Pacific Ocean: Anonyx validus group. Canadian Journal of Zoology, 61, 2921 - 2931. http: // dx. doi. org / 10.1139 / z 83 - 380","Steele, D. H. (1991) The genus Anonyx (Crustacea, Amphipoda) in the North Pacific and Arctic oceans: the Anonyx bispinosus group. Canadian Journal of Zoology, 69, 1600 - 1611. http: // dx. doi. org / 10.1139 / z 91 - 224","Kudrjaschov, V. A. (1965) New amphipod species of the family Lysianassidae (Amphipoda-Gammaridea) from the Okhotsk Sea. Zoologichesky Zhurnal, 44, 513 - 520.","Steele, D. H. (1986) The genus Anonyx (Crustacea, Amphipoda) in the North Pacific and Arctic Oceans: Anonyx laticoxae group. Canadian Journal of Zoology, 64, 2603 - 2623. http: // dx. doi. org / 10.1139 / z 86 - 380","Sekiguchi, H. & Yamaguchi, Y. (1983) Scavenging gammaridean amphipods from the deep-sea floor. Bulletin of the Faculty of Fisheries, Mie University, 10, 1 - 14.","Boeck, A. (1871) Crustacea Amphipoda borealia et arctica. Forhandlinger i Videnskabs-Selskabet i Christiania, 1870, 81 - 280, i - viii. [index] http: // dx. doi. org / 10.5962 / bhl. title. 2056","Pearse, A. S. (1913) Notes on a small collection of amphipods from the Pribilof Islands, with descriptions of new species. Proceedings of the United States National Museum, 45, 571 - 573. http: // dx. doi. org / 10.5479 / si. 00963801.45 - 1998.571","Hirayama, A. (1985) Taxonomic Studies on the Shallow Water Gammaridean Amphipoda of West Kyushu, Japan V. Leucothoidae, Liljeborgiidae, Lysianassidae (Prachynella, Aristias, Waldeckia, Ensayara, Lepidepecreum, Hippomedon and Anonyx). Publications of the Seto Marine Laboratory, 30 (4 / 6), 167 - 212."]}

Nagada Lowry & Stoddart, 1995 (Fig. 26) Nagada Lowry & Stoddart, 1995b: 146.— Lowry & Stoddart, 2003: 283. Type species. Nagada uwedoae Lowry & Stoddart, 1995, by original designation. Included species. Nagada includes three species: N. garagassi Lowry & Stoddart, 1995b; N. papua Lowry & Stoddart, 1995b; Nagada uwedoae Lowry & Stoddart, 1995b. Diagnostic description. Antenna 1 peduncle without posterodistal lobe or spine; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 without brush setae. Mandible incisors large, convex; left lacinia mobilis a cuspidate peg; molar a setose tongue. Maxilla 1 outer plate setal-teeth a well developed 7/4 crown. Maxilla 2, inner plate significantly shorter than outer. Gnathopod 1 simple; coxa large, about as large as coxa 2 with a straight anterior margin; ischium long (length 2 × to 4 × breadth); carpus long (length 2 to 4 × breadth), dactylus with or without complex spines on posterior margin. Uropod 2 inner ramus constricted. Uropod 3 outer ramus article 2 long. Telson entire. Remarks. Based on simple first gnathopod with long ischium and an entire telson Nagada is similar to Eclecticus. Both genera have the mandibular palp attached midway, both have a well developed 7/4 crown on the outer plate of maxilla 1, and both have a long ischium on the first gnathopod. They differ mainly in the dactylus of gnathopod 1 which has an explosion of complex setae on the anterior margin in Eclecticus., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 41, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Lowry, J. K. & Stoddart, H. E. (1995 b) The Amphipoda (Crustacea) of Madang Lagoon: Lysianassidae, Opisidae, Uristidae, Wandinidae and Stegocephalidae. Records of the Australian Museum, Supplement, 22, 97 - 174. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.22.1995.122","Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. Vol. 19.2 B. CSIRO Publishing, Melbourne, 531 pp."]}

Nagada papua Lowry & Stoddart, 1995 Nagada papua Lowry & Stoddart, 1995: 150, figs 31–33. Types. Holotype, female, 3.8 mm, AM P.41599. Paratypes: 8 females, AM P.41600; 1 male, AM P.41601; 83 specimens, AM P.41602; 20 specimens, AM P.41603; 10 specimens, BMNH 1995.582.591; 10 specimens, USNM 274111. Type locality. Face of outer barrier between Dam Awan (Rasch Passage) and Wongad, Astrolabe Bay, Papua New Guinea (5°08.59’S 145°49.65’E), 290 m depth. Habitat. Marine. Depth range. 50–290 m (Lowry & Stoddart 1995). Feeding strategies. Scavenger, taken in baited traps. Distribution. Papua New Guinea. Astrolabe Bay (Lowry & Stoddart 1995).

Stephonyx scutatus (Griffiths, 1977) Euonyx scutatus Griffiths, 1977: 98, fig. 3.— Barnard & Ingram, 1990: 3 (key).— Barnard & Karaman, 1991: 485. Stephonyx scutatus.— Lowry & Stoddart, 1989: 521.— Diffenthal & Horton, 2007: 40 (key).— Senna & Serejo, 2007: 13 (key).— Narahara et al., 2012: 1505 (key). Types. Holotype female, 16 mm, SAM A13652. Type locality. Cape Basin, South Atlantic Ocean (34°37'S 17°03'E). Habitat. Marine. Depth range. 2900 m (Griffiths 1977). Remarks. Stephonyx scutatus is different from other species of Stephonyx in the dorsal body carination and in the peculiar conical hump of coxa 5. The mandibular molar, described as ‘a large plate with raised margins’ is not like the setose tongues or triturating molars usually found in scavenging uristids and particularly in Stephonyx. Distribution. South Atlantic Ocean. Cape Basin (Griffiths 1977)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 78, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Griffiths, C. L. (1977) Deep-sea amphipods from west of Cape Point, South Africa. Annals of the South African Museum, 73, 93 - 104.","Barnard, J. L. & Ingram, C. (1990) Lysianassoid Amphipoda (Crustacea) from deep-sea thermal vents. Smithsonian Contributions to Zoology, 499, 1 - 80. http: // dx. doi. org / 10.5479 / si. 00810282.499","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Lowry, J. K. & Stoddart, H. E. (1989) Stephonyx, a new, widespread genus of lysianassoid Amphipoda. Zoologica Scripta, 18, 519 - 525. http: // dx. doi. org / 10.1111 / j. 1463 - 6409.1989. tb 00145. x","Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598"]}

Stephonyx incertus Bellan-Santini, 1997 Stephonyx incertus Bellan-Santini, 1997: 16, figs 9, 10.— Ortiz et al., 2007: 516.— Diffenthal & Horton, 2007: 40 (key).— Senna & Serejo, 2007: 13 (key).— Narahara et al., 2012: 1506 (key). Types. Holotype, 8 mm, MNHN-Am 4904. Type locality. Barbados trench, North Atlantic Ocean (10°19.97'N 58°37.30'W), 1947 m depth. Habitat. Marine, cold-seeps. Depth range. 1947 m (Bellan-Santini 1997). Distribution. North Atlantic Ocean. Barbados trench (Bellan-Santini 1997)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 67, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Bellan-Santini, D. (1997) Amphipods of the cold seep community on the South Barbados Accretionary Prism. Crustaceana, 70, 1 - 30. http: // dx. doi. org / 10.1163 / 156854097 x 00311","Ortiz, M., Martin, A. & Diaz, Y. J. (2007) Lista y referencias de los crustaceos anfipodos (Amphipoda: Gammaridea) del Atlantico occidental tropical. Revista de Biologia Tropical, 55 (2), 479 - 528. http: // dx. doi. org / 10.15517 / rbt. v 55 i 2.6026","Diffenthal, M. & Horton, T. (2007) Stephonyx arabiensis (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deepwater scavenger species from the Indian Ocean, with a key to the genus Stephonyx. Zootaxa, 1665, 31 - 41.","Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598"]}

Parschisturella medora sp. nov. (Figs 33–35) Types. Holotype, female, 11.0 mm, NMV J67756, 96 km south of Point Hicks, Victoria, Australia (38°40.29'S 149°18.06'E), 2900 m, compacted clay, WHOI epibenthic sled, 25 October 1988, G.C.B. Poore et al., RV Franklin [SLOPE 66]. Paratypes: 8 specimens, 4.0– 8.7 mm, NMV J67757; 1 female, 10.3 mm, NMV J67758; 6 specimens, 5.4–10.2 mm, NMV J17167, same collection details as holotype. Type locality. 96 km south of Point Hicks, Victoria, Australia (38°40.29'S 149°18.06'E), 2900 m depth. Etymology. Named for the brig Medora which caught fire off the Tamar Heads, Tasmania, on the morning of 31 July 1854 and was scuttled after cutting away the mast; used as a noun in apposition. Additional material examined. Tasmania. 18 specimens, AM P.71839, east of Cape Naturaliste, Tasmania, Australia (40°45.93’S 149°1.62’E), 2400–2500 m, sledge, 10 December 1986, P.A. Hutchings, W.F. Ponder & R. T. Springthorpe, RV Franklin [FR1086-04]; 1 specimen, NMV J67760, 48 km east-north-east of Cape Tourville (42°00.25'S 148°43.55'E to 41°57.77'S 148°42.08'E), 1264– 1130 m, gravel with lumps of sandy mud aggregate, WHOI epibenthic sled, 30 October 1988, G.C.B. Poore et al., RV Franklin [SLOPE 81]. Victoria. 1 specimen, NMV J67759, 67 km south of Point Hicks (38°23.95'S 149°17.02'E), 1277 m, fine mud, WHOI epibenthic sled, 25 October 1988, G.C.B. Poore et al., RV Franklin [SLOPE 67]. Description. Based on holotype, female, 11.0 mm, NMV J67756. Head, lateral cephalic lobe subtriangular, apically subacute. Antenna 1 peduncular article 1 without anterodistal lobe; accessory flagellum not forming cap, 5-articulate, terminal article not offset; primary flagellum with strong 1-field callynophore; robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged; flagellum short; calceoli absent. Labrum, epistome and upper lip fused, concave; ventrally produced, acute apically. Mandible incisor large, left and right very slightly asymmetrical; molar with asymmetrically reduced column, proximally setose, distally triturating; palp attached slightly distally, article 2 margins subparallel, article 3 bladelike. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally along inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 6 long, apical robust setae. Gnathopod 1 weakly subchelate; coxa large, about as long as coxa 2, distally subovate; basis moderately to densely setose along anterior margin; ischium long (length 2 × to 4 × breadth); carpus long (length 2 to 4 × breadth), longer than propodus, without posterior lobe; propodus margins tapering distally; dactylus with large subapical spine. Gnathopod 2 propodus palm slightly obtuse; dactylus fitting palm. Pereopod 4 coxa with a welldeveloped posteroventral lobe. Pereopod 5 coxa without distinct lateral ridge; basis about as long as broad, posterior margin weakly serrate. Pereopod 7 basis posterodistally produced less than halfway along merus. Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner acutely produced, forming weak spine. Urosomite 1 not projecting over urosomite 2, with a weakly produced, broadly truncated boss. Uropod 2 inner ramus without constriction. Uropod 3 peduncle without dorsolateral flange; outer ramus article 2 short, without plumose setae on rami. Telson deeply cleft, without dorsal robust setae, with 1 apical robust setae on each lobe. Sexually dimorphic characters. Male unknown. Depth range. 1264–2900 m. Remarks. The Australian species Parschisturella medora and P. piloti both have weakly subchelate first gnathopods. The most conspicuous differences between these species is the posteroventral corner of epimeron 3 (forming a small spine in P. medora and with a small notch above the corner in P. piloti), and the dorsal margin of urosomite 1 (a weakly produced, broadly truncated boss in P. medora and a rounded margin in P. piloti). Distribution. Australia. Coasts of Victoria and Tasmania, Bass Strait., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 54-57, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734

Stephonyx uncinatus Senna & Serejo, 2007 Stephonyx uncinatus Senna & Serejo, 2007: 8, figs 1–3.— Narahara et al., 2012: 1506 (key). Types. Holotype, male, 36 mm, MNRJ 19498. Paratypes: 13 specimens (four males, five females, four juveniles), MNRJ 18292; four specimens (one male, two females, one juvenile), MNRJ 18293. Type locality. Off the coast of Bahia State, Brazil (14°27’654”S 38°51’130”W), 730–739 m depth. Habitat. Marine. Depth range. 687–739 m (Senna & Serejo 2007). Feeding strategies. Scavenger, taken in baited traps (Senna & Serejo 2007). Distribution. Brazil. Off the coast of Bahia State (Senna & Serejo 2007)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 78, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Senna, A. R. & Serejo, C. (2007) A new deep-sea species of Stephonyx (Lysianassoidea: Uristidae) from off the central coast of Brazil. Nauplius, 15 (1), 7 - 14.","Narahara, Y., Tomikawa, K. & Torigoe, K. (2012) Four species of the genus Stephonyx (Crustacea: Amphipoda: Uristidae) from Japan, with description of a new species. Journal of Natural History, 46, 1477 - 1507. http: // dx. doi. org / 10.1080 / 00222933.2012.675598"]}

Parschisturella carinata (Schellenberg, 1926b) Hoplonyx stebbingi Walker, 1903: 52, pl. 9 figs 52–57 (in part, part = Uristes stebbingi). Tryphosa kergueleni.— Walker, 1907: 16 (in part). Tryphosites stebbingi.— Chilton, 1912: 469. Tryphosa carinata Schellenberg, 1926b: 271, fig. 18.— Schellenberg, 1931: 36.—J.L. Barnard, 1962: 29. Tmetonyx carinata.—K.H. Barnard, 1932: 55.—J.L. Barnard, 1958: 100. Tryphosites capadarei.— Hurley, 1965: 177, figs 14, 15.— Thurston & Allen, 1969: 372.— Lowry & Bullock, 1976: 109.— Andres, 1983: 212. 'Tryphosa' carinata.—J.L. Barnard, 1969: 304 (key).— Lowry & Bullock, 1976: 106. Parschisturella carinata.— Barnard & Karaman, 1991: 517.— Klages, 1991: 50.— De Broyer & Jazdzewski, 1993: 74.— De Broyer et al., 1999: 166.— Dauby et al., 2001: 81.— De Broyer et al., 2001: 746, table 1.— Nyssen et al., 2002: 282, 283, table 1, fig. 4.— De Broyer et al., 2004: 1740, tables 3, 4.— De Broyer et al., 2007: 165. Types. Syntypes, ZMB 20304. Type-locality. Davis Sea “Gauss Station” (66°02’S 89°38’E), 385 m. Habitat. Marine. Depth range. 14–2081 m (Walker 1907; De Broyer et al. 2001). Feeding strategies. Scavenger, taken in baited traps. Remarks. Parschisturella carinata is the most distinctive species in the genus because of the parachelate first gnathopod with its serrate palm. It is the only species with a distict constriction on the outer ramus of uropod 2. It shares a rounded boss on urosomite 1 with the Ausralian species P. martrudan and P. piloti. It shares a well developed spine on the posteroventral corner of epimeron 3 with the Australian species P. martrudan and P. medora. Distribution. Southern Ocean. Davis Sea (Schellenberg 1926b); Ross Sea (Walker 1903, 1907); Weddell Sea (Chilton 1912; De Broyer et al. 1999; De Broyer et al. 2004); South Georgia (Schellenberg 1931); South Shetland Islands (K.H. Barnard 1932)., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on pages 48-50, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Schellenberg, A. (1926 b) Die Gammariden der Deutschen Sudpolar-Expedition 1901 - 1903. Deutsche Sudpolar-Expedition, 18, 235 - 414.","Walker, A. O. (1903) Amphipoda of the ' Southern Cross' Antarctic Expedition. Journal of the Linnean Society of London, Zoology, 29 (187), 38 - 64, pls. 37 - 11.","Walker, A. O. (1907) Crustacea III. - Amphipoda. National Antarctic Expedition 1901 - 1904. Natural History, 3, 1 - 38, pls. 31 - 13.","Chilton, C. (1912) The Amphipoda of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh, 48, 455 - 520, pls. 451, 452.","Schellenberg, A. (1931) Gammariden und Caprelliden des Magellangebietes, Sudgeorgiens und der Westantarktis. Further Zoological Results of the Swedish Antarctic Expedition 1901 - 1903, 2, 1 - 290, pl. 291.","Barnard, J. L. (1962) South Atlantic abyssal amphipods collected by R. V. Vema. Abyssal Crustacea. Vema Research Series, 1, 1 - 78.","Barnard, K. H. (1932) Amphipoda. Discovery Reports, 5, 1 - 326, pls. 321.","Barnard, J. L. (1958) Index to the families, genera, and species of the gammaridean Amphipoda (Crustacea). Allan Hancock Foundation Publications, Occasional Paper, 19, 1 - 145.","Hurley, D. E. (1965) A re-description of some A. O. Walker types of \" Southern Cross \" Lysianassidae (Crustacea Amphipoda) from the Ross Sea. Transactions of the Royal Society of New Zealand, Zoology, 6, 155 - 181.","Thurston, M. H. & Allen, E. (1969) Type material of the families Lysianassidae, Stegocephalidae, Ampeliscidae and Haustoriidae (Crustacea: Amphipoda) in the collections of the British Museum (Natural History). Bulletin of the British Museum (Natural History), Series Zoology, 17, 347 - 388.","Lowry, J. K. & Bullock, S. (1976) Catalogue of the marine gammaridean Amphipoda of the Southern Ocean. Royal Society of New Zealand Bulletin, 16, 1 - 187.","Andres, H. G. (1983) Die Gammaridea (Crustacea: Amphipoda) der Deutschen Antarktis-Expeditionen 1975 / 76 und 1977 / 78. 3. Lysianassidae. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 80, 183 - 220.","Barnard, J. L. (1969) The families and genera of marine gammaridean Amphipoda. Bulletin of the United States National Museum, 271, 1 - 535. http: // dx. doi. org / 10.1163 / 156854082 x 00632","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Klages, M. (1991) Biologische und populationsdynamische Untersuchungen an ausgewahlten Gammariden (Crustacea; Amphipoda) des sudostlichen Weddellmeeres, Antarktis. Dissertation Dr. Naturwissenschaften, Universitat Bremen, 240 pp.","De Broyer, C. & Jazdzewski, K. (1993) Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut Royal des Sciences Naturelles de Belgique, 73, 1 - 154.","De Broyer, C., Rauschert, M. & Scailteur, Y. (1999) Structural and ecofunctional biodiversity of the benthic amphipod taxocoenoses. Berichte zur Polarforschung, 301, 163 - 174.","Dauby, P., Scailteur, Y. & De Broyer, C. (2001) Trophic diversity within the eastern Weddell Sea amphipod community. Hydrobiologia, 443, 69 - 86.","De Broyer, C., Scailteur, Y., Chapelle, G. & Rauschert, M. (2001) Diversity of epibenthic habitats of gammaridean amphipods in the eastern Weddell Sea. Polar Biology, 24, 744 - 753. http: // dx. doi. org / 10.1007 / s 003000100276","Nyssen, F., Brey, T., Lepoint, G., Bouquegneau, J. M., De Broyer, C. & Dauby, P. (2002) A stable isotope approach to the eastern Weddell Sea trophic web: focus on benthic amphipods. Polar Biology, 25, 280 - 287.","De Broyer, C., Guerra-Garcia, J. M., Takeuchi, I., Robert, H. & Meerhaeghe, A. (2004) Biodiversity of the Southern Ocean: a catalogue of the Antarctic and sub-Antarctic Caprellidae and Cyamidae (Crustacea: Amphipoda) with distribution and ecological data. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique Biologie, 74, 61 - 99.","De Broyer, C., Lowry, J. K., Jazdzewski, K. & Robert, H. (2007) Catalogue of the Gammaridean and Corophiidean Amphipoda (Crusteacea) of the Southern Ocean with distribution and ecological data. In: C. De Broyer (Ed), Census of Antatrctic Marine Life: Synopsis of the Amphipoda of the Southern Ocean. Vol. 1. Bulletin de l'Institut Royal des Sciences Naturelles de Belqigue, Biologie 77, Supplement 1 (1), 1 - 325."]}

Galathella Barnard & Karaman 1987 (Fig. 16) Galathella Barnard & Karaman 1987: 866.— Barnard & Karaman 1991: 488.—Lowry & Stoddart, 1995: 12.— Lowry & Stoddart 2003: 281 (catalogue). Type species. Schisturella galatheae Dahl, 1959, original designation. Included species. Galathella includes 5 species: G. bassiana Lowry & Stoddart, 1995; G. galatheae (Dahl, 1959); G. latipes (Ledoyer, 1986); G. palana Lowry & Stoddart, 1995; G. solivagus Kilgallen, 2009. Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 without brush setae. Mandible molar a reduced column with triturating surface. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate slightly shorter to significantly shorter than outer plate. Gnathopod 1 weakly to strongly subchelate or simple; coxa 1 reduced or large, shorter than coxa 2, tapering; ischium short (length less than 2 × breadth) or long (length more than 2 × breadth); carpus long to very long (greater than 2 × breadth); propodus margins tapering distally. Uropod 2 inner ramus not constricted. Telson moderately to deeply cleft. Remarks. Galathella is the only uristid with gnathopod 1 coxa slightly shorter than coxa 2 and tapering distally, similar to Ventiella in which coxa 1 is more reduced and tapering. These genera differ mainly in maxilla 2 (inner plate longer than outer plate in Ventiella) and in the cleftness of the telson (moderately to deeply in Galathella and notched in Ventiella). Distribution. South-western Pacific Ocean: Kermadec Trench. Eastern Australia. Western Indian Ocean., Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1) on page 28, DOI: 10.11646/zootaxa.3867.1.1, http://zenodo.org/record/5585734, {"references":["Barnard, J. L. & Karaman, G. S. (1987) Revisions in classification of gammaridean Amphipoda (Crustacea), Part 3. Proceedings of the Biological Society of Washington, 100, 856 - 875.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Records of the Australian Museum, Supplement, 13, 1 - 866. http: // dx. doi. org / 10.3853 / j. 0812 - 7387.13.1991.367","Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. Vol. 19.2 B. CSIRO Publishing, Melbourne, 531 pp.","Dahl, E. (1959) Amphipoda from depths exceeding 6000 meters. Galathea Report, 1, 211 - 241.","Ledoyer, M. (1986) Crustaces Amphipodes Gammariens. Familles des Haustoriidae a Vitjazianidae. Faune de Madagascar, 59, 599 - 1112.","Kilgallen, N. M. (2009) New species of lysianassoid Amphipoda (Crustacea) associated with seamounts, marine canyons and cold seeps of New Zealand. Zootaxa, 2298, 1 - 30."]}