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Key to Eurythenes specimens larger than 25 mm. This key is expanded from d’ Udekem d’ Acoz and Havermans (2015), and the caution of use remains. Character differences can be tough to objectively discern, and certain characteristics can be phenotypically variable between cohorts. Visual identification paired with DNA barcoding is strongly recommended. 1. Dactylus of pereopods 3–7 short (less than 0.3 of propodus)....................................................................................................2 Dactylus of pereopods 3–7 long (more than 0.6 of propodus).......................................... Eurythenes obesus (Chevreux, 1905) 2. The palm of gnathopod 2 minutely chelate or very protruding.................................................................................................3 The palm of gnathopod 2 subchelate or weakly protruding......................................................................................................4 3. The anterodorsal margin of the head forming an upturned ridge; posterodistal lobe of the basis of pereopod 7 very long...................................................................................................................... Eurythenes thurstoni Stoddart & Lowry, 2004 The anterodorsal margin of the head not forming an upturned ridge; palm of gnathopod 1 very short; posterodistal lobe of the basis of pereopod 7 short or fairly short................................................................................. Eurythenes atacamensis sp. nov. 4. Pereopods 6–7 and epimerons 1–3 not dorsally keeled to slightly keeled; pereopods 6–7 and epimerons 1–2 dorsally not sigmoid (without anterior concavity), epimeron 3 with distinct anterior concavity..................................................................5 Pereopods 6–7 and epimerons 1–3 dorsally strongly keeled and sigmoid (anteriorly slightly to distinctly concave)................................................................................... Eurythenes sigmiferus d’ Udekem d’ Acoz & Havermans, 2015 5. Eyes of variable width; the outer plate of maxilla 1 with 8/3 crown arrangement...................................................................6 Eyes of constant width; the outer plate of maxilla 1 with 9/3 crown arrangement.............................................................. Eurythenes aequilatus Narahara-Nakano, Nakano & Tomikawa, 2018 6. Article 2 of mandibular palp moderately to strongly expanded posteriorly..............................................................................7 Article 2 of mandibular palp not to weakly expanded posteriorly............................................................................................8 7. Maxilliped with 3 non-protruding nodular spines; pereopod 7 with basis posteriorly strongly expanded, with merus narrow..................................................................................... Eurythenes andhakarae d’ Udekem d’ Acoz & Havermans, 2015 Maxilliped with 8–9 non-protruding nodular spines; pereopod 7 with basis posterior border weakly expanded, with merus stout........................................................................................... Eurythenes maldoror d’ Udekem d’ Acoz & Havermans, 2015 8. Gnathopod 2 palm convex; uropod 1 and 2 rami subequal.......................................................................................................9 Gnathopod 2 palm straight; the outer ramus of uropod 1 and 2 are shorter than paired inner ramus......................................................................................................... Eurythenes magellanicus (H. Milne Edwards, 1848) 9. Ventral corner of eye rounded and obliquely pointing backward; maxilliped with 3–4 protruding nodular spines; gnathopod 1 palm convex....................................................................................................................… Eurythenes plasticus Weston, 2020a Ventral corner of eye sharp and pointing downward; maxilliped with 3–4 non-protruding nodular spines; gnathopod 1 palm straight…........................................................................................................ Eurythenes gryllus (Lichtenstein in Mandt, 1822), Published as part of Weston, Johanna N. J., Espinosa-Leal, Liliana, Wainwright, Jennifer A., Stewart, Eva C. D., González, Carolina E., Linley, Thomas D., Reid, William D. K., Hidalgo, Pamela, Oliva, Marcelo E., Ulloa, Osvaldo, Wenzhöfer, Frank, Glud, Ronnie N., Escribano, Rubén & Jamieson, Alan J., 2021, Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean, pp. 1-20 in Marine Biodiversity 51 (51) on page 12, DOI: 10.1007/s12526-021-01182-z, http://zenodo.org/record/5841926, {"references":["d' Udekem d' Acoz C, Havermans C (2015) Contribution to the systematics of the genus Eurythenes S. I Smith in Scudder 1882 (Crustacea: Amphipoda: Lysianassoidea: Eurytheneidae). Zootaxa 3971: 1 - 80. https: // doi. org / 10.11646 / zootaxa. 4196.3.9","Chevreux E (1905) Description d' un amphipode (Katius obesus, nov. gen. et sp.), suivie d' une liste des amphipodes de la tribu des Gammarina ramenes par le filet a grand eouverture pendant la derniere campagne de la Princesse-Alice en 1904. Bull Inst Oceanogr Monaco 35: 1 - 7","Stoddart HE, Lowry JK (2004) The deep-sea lysianassoid genus Eurythenes (Crustacea, Amphipoda, Eurytheneidae n. fam.). Zoosystema 26: 425 - 468","Narahara-Nakano Y, Nakano T, Tomikawa K (2018) Deep-sea amphipod genus Eurythenes from Japan, with a description of a new Eurythenes species from off Hokkaido (Crustacea: Amphipoda: Lysianassoidea). Mar Biodivers 48: 603 - 620. https: // doi. org / 10. 1007 / s 12526 - 017 - 0758 - 4","Milne Edwards H (1848) Sur un crustace amphipode, remarquable par sa grand etaille. Ann Sci Nat Zool 3: 98. https: // doi. org / 10.5962 / bhl. title. 15975","Weston JNJ, Carrillo-Barragan P, Linley TD, Reid WDK, Jamieson AJ (2020 a) New species of Eurythenes from hadal depths of the Mariana Trench, Pacific Ocean (Crustacea: Amphipoda). Zootaxa 4748: 163 - 181. https: // doi. org / 10.11646 / zootaxa. 4748.1.9"]}

Eurythenes S.I. Smith in Scudder, 1882 (Crustacea: Amphipoda) are prevalent scavengers of the benthopelagic community from bathyal to hadal depths. While a well-studied genus, molecular systematic studies have uncovered cryptic speciation and multiple undescribed lineages. Here, we apply an integrative taxonomic approach and describe the tenth species, Eurythenes atacamensis sp. nov., based on specimens from the 2018 Atacamex and RV Sonne SO261 Expeditions to the southern sector of the Peru-Chile Trench, the Atacama Trench (24–⁠21°S). Eurythenes atacamensis sp. nov. is a large species, max. observed length 83.2 mm, possesses diagnostic features, including a short gnathopod 1 palm and a chelate gnathopod 2 palm, and a distinct genetic lineage based on a 16S rRNA and COI phylogeny. This species is a dominant bait-attending fauna with an extensive bathymetric range, spanning from 4974 to 8081 m. The RV Sonne SO261 specimens were recovered along a 10-station transect from abyssal to hadal depths and further examined for demographic and bathymetric-related patterns. Ontogenetic vertical stratification was evident across the trench axis, with only juveniles present at abyssal depths (4974–6025 m). Total length-depth analysis revealed that the size of females was unrelated to depth, whereas juveniles followed a sigmoidal relationship with a step-up in size at depths >7200 m. Thus, these bathymetric trends suggest that juveniles and females employ differing ecological strategies in subduction trench environments. This study highlights that even dominant and ecologically important species are still being discovered within the abyssal and hadal environments. Continued systematic expeditions will lead to an improved understanding of the eco-evolutionary drivers of speciation in the world’s largest ecosystem.

Eurythenes atacamensis sp. nov. Weston & Espinosa-Leal (Figures 2–6) http://zoobank.org/51F715E8-AD60-403C-B39A-06F3A3223935 Eurythenes gryllus — Ingram and Hessler 1987: 1889.— Thurston et al. 2002: 205–210, figs. 1–7, table 1.— Jamieson et al. 2019: 1–9, fig. 1, table 1. Eurythenes gryllus Peru-Chile (H)— Ritchie et al. 2015: 121–129, figs.2, 4, tables 1, 2. Eurythenes sp. (Hadal Form)— Eustace et al. 2016: 91–97, fig. 1, fig. 2 (d)(e)(f), fig. 5, tables 2, 3. Material Examined. Holotype: Female, total body length 76.2 mm, Atacama Trench, eastern South Pacific Ocean (23° 22.774′ S, 71° 20.683′ W), expedition SO216, station 4, depth 8052 m, MNHNCL AMP-15816, genseq-1 16S (MW042884), COI (MW048996). Paratypes: Female, total body length 70 mm, Atacama Trench, Pacific Ocean (23° 24.48′ S, 71° 19.91′ W), Atacamex Expedition, station 2, depth 8081 m, MZUC/UCCC 46674. Female, total body length 72 mm, Atacama Trench, Pacific Ocean (23° 24.48′ S, 71° 19.91′ W), Atacamex Expedition, station 2, depth 8081 m, MZUC/UCCC 46675, genseq-2 16S (MW290039), COI (MW288146). Male, total body length 50.8 mm, Atacama Trench, Pacific Ocean (23° 22.384′ S, 71° 23.577′ W), expedition SO216, station 4, depth 7204 m, MNHNCL AMP-15817. Female, type locality, MNHNCL AMP-15822. Intersex, total body length 58.8 mm, Atacama Trench, Pacific Ocean (24° 16.233′ S, 71° 25.386′ W), expedition SO216, station 6, depth 7834 m, MNHNCL AMP-15820, genseq-2 16S (MW042883). Juvenile, total body length 16.1 mm, Atacama Trench, Pacific Ocean (21° 44.497′ S, 71° 15.465′ W), expedition SO216, station 2, depth 6738 m, MNHNCL AMP-15819. Juvenile, total body length 38.4 mm, Atacama Trench, Pacific Ocean (21° 44.497′ S, 71° 15.465′ W), expedition SO216, station 2, depth 6714 m, MNHNCL AMP-15818. Juvenile, Atacama Trench, Pacific Ocean (22° 56.282′ S, 71° 40.686′ W), expedition SO216, station 7, depth 4974 m, MNHNCL AMP-15821. Paragenetype: Juvenile, Atacama Trench, Pacific Ocean (22° 56.282′ S, 71° 40.686′ W), expedition SO216, station 7, depth 4974 m, genseq-2 16S (MW042880). Juvenile, Atacama Trench, Pacific Ocean (20° 20.608′ S, 71° 07.821′ W), expedition SO216, station 10, depth 5920 m, genseq-2 16S (MW042881), COI (MW048993). Female, Atacama Trench, Pacific Ocean (23° 02.998′ S, 71° 15.044′ W), expedition SO216, station 3, depth 7139 m, genseq-2 16S (MW042882), COI (MW048994). Type Locality. Atacama Trench, eastern South Pacific Ocean (23° 22.774′ S, 71° 20.683′ W), expedition SO216, station 4, depth 8052 m. Etymology. The species name, atacamensis, references the type locality, Atacama Trench, of this conspicuously abundant scavenging amphipod. Diagnosis. Lateral cephalic lobe rounded and weakly pronounced. Ventral corner of the eye points linearly downwards. Article 2 of mandibular palp expanded posteriorly but not distally tapering. Maxilliped inner plate with three apical, non-protruding nodular setae. Gnathopod 1 subchelate; palm weakly formed, short. Gnathopod 2 minutely chelate; coxa sub-rectangular and posterior margin slightly rounded; palm obtusely angled. Pereopods 3 to 7 dactylus short. Epimeron 3 ventral margin rounded with a small tooth on the posteroventral corner. Uropod 2 inner ramus longer than outer ramus. Lack of dorsal carination or ridging, specifically at pereonite 3. Description, based on holotype, female, MNHNCL AMP-15816. Body (Fig. 2): surface smooth, without setae; urosomite 3 with an anterodorsal depression. Oostegites present on gnathopod 2 to pereopod 5, setae absent. Coxa gills present on gnathopod 2 to pereopod 7. Colour pattern before ethanol preservation unknown as the holotype was selected post-expedition. Head (Fig. 3): rostrum absent; antennal sinus quadrate (Fig. 3d). Antenna 1 short, 0.13× as long as body length; accessory flagellum 14-articulate; primary flagellum 34- articulate; calceoli absent (Fig. 3a). Antenna 2 2.4× the length of antenna 1, 0.25× as long as body; article 4–5 with brush setae; flagellum 68-articulate with some brush setae; calceoli absent (Fig. 3b). Mouthpart bundle (Fig. 3): Mandible left lacinia mobilis a long slender robust seta with smooth distal margin; incisor smooth and convex; setal row with 11 short, slender, robust setae; molar large, setose, small triturating surface; palp article-length ratio 1: 1.8: 1.6, article 3 sickle-shaped (Fig. 3c). Maxilla 1 inner plate with nine apical plumose setae; outer plate with an 8/3- crown arrangement; palp longer than the outer plate, 2- articulate, four apical and one apicolateral robust setae, with one subapical long setae (Fig. 3e–h). Maxilla 2 both plates broad, inner plate 0.6 × shorter than the outer plate (Fig. 3i). Maxilliped inner plate subrectangular, three apical, non-protruding nodular setae; outer plate subovate; palp 4-articulate, left and right are asymmetric with right palp exceeding past the outer plate, dactylus well-developed, unguis present (Figure 3j–l). Pereon (Figs. 4 and 5): Gnathopod 1 coxa sub-quadrate, weakly concave on anterior and ventral margins; basis, long, length 2.2× breadth; palm weakly formed and short (0.1× as long as the posterior margin of propodus), crenulate with one robust seta at base of the palm and another at the end of palm (Fig. 4a–b). Gnathopod 2 coxa with setae along the posteroventral corner; basis elongate, length 6.9 times width, setae along posterior and ventral margins; posterior margin of merus expanded; propodus sub-rectangular, length 4.5 times width; palm with 2 robust setae on the posterodistal corner; dactylus not reaching palmar corner (Fig. 4c–d). Pereopod 3 coxa sub-quadrate, 1.5× as long as wide, setae on the surface of coxa and along ventral margin; basis expanded posteriorly, 2.3× as long as wide; merus expanded anteriorly, tuft of setae on the anteroventral corner; carpus stout, 0.6× as long as propodus; propodus 3.9× as long as wide; dactylus slender, short 0.3× as long as propodus, unguis present (Fig. 4e). Pereopod 4 coxa broad, 0.9× as long as wide, 1.1× length of coxa 3, the junction between anterior and ventral border bluntly angular (sub-rectangular), ventral border straight, posteroventral border weakly oblique; leg almost identical to pereopod 3 (Fig. 4f). Pereopod 5 coxa sub-rectangular, rounded on both the anterior and posterior margins; basis expanded posteriorly, posterior margin weakly crenulated; merus broadly expanded posteriorly, 1.5× as long as wide, posteroventral margin producing a point; carpus stout, 0.4× as long as propodus; propodus long and slender, 5.5× as long as wide, 11 groups robust setae along anterior margin; dactylus short, 0.4× as long as propodus, unguis present (Fig. 5a). Pereopod 6 coxa sub-rectangular, setae along the ventral margin, posterior margin straight; basis expanded posteriorly with posterior margin crenulated; merus expanded posteriorly, 1.5× as long as wide, convex posterior margin; propodus and dactylus nearly identical to pereopod 5 (Fig. 5b). Pereopod 7 coxa sub-rectangular; basis expanded posteriorly, posterior margin distinctly crenulated, distal lobe weakly protruding; merus broad and strongly expanded posteriorly, subequal length to width; propodus and dactylus nearly identical to pereopod 5 (Fig. 5c). Pleon and urosome (Fig. 5): Epimeron 1 with setae along the anteroventral corner (Fig. 5d). Epimeron 2 with setae along the ventral margin, posteroventral corner produced into a strong tooth (Fig. 5d). Epimeron 3 ventral margin rounded with a small tooth on the posteroventral corner (Fig. 5d). Uropod 1 peduncle with 1 apicomedial seta, rami subequal, outer ramus 0.8× as long as peduncle (Fig. 5e). Uropod 2 peduncle with 2 apicomedial setae, outer ramus subequal in length to peduncle, inner ramus longer than outer ramus (1.2×; Fig. 5f). Uropod 3 setae of the distolateral angle of peduncle of normal length and stoutness; inner ramus subequal in length to article 1 of the outer ramus; outer rami article 2 0.8× the length of article 1, medial margins of both rami with plumose setae (Fig. 5g). Telson 77% cleft, distal margin of each lobe with one robust and one slender setae (Fig. 5h–i). Variations. Prior to ethanol preservation, body colour of specimens ranged from white, pink, crimson, to dark red and the eye shape and colour were more defined (Fig. 6). This wide variation in body pigmentation is likely attributed to the moult/intermoult cycle (Baldwin and Smith 1987). Minor differences were observed between females and the male. The mature male paratype (MNHNCL AMP-15817) had calceoli present on both antennas 1 and 2. The primary flagellum of antenna 1 was 31-articulate with calceoli present between articles 8 and 20, and the accessory flagellum was 12-articulate. Antenna 2 was 65-articulate. The intersex paratype (MNHNCL AMP-15820) had protruding penile papillae that flexed towards each other but lacked calceoli on antenna 1 or 2. As with the holotype, the oostegites were present on pereopod 2–5; however, the flattened oostegites were not of full length relative to the total body length and lacked setae. Moderate differences were present between sexed and juvenile specimens, with fewer setae on pereopods and uropods and a reduction in articulation on antennae. Specifically, in the juvenile paratype (MNHNCL AMP-15818), the antenna 1 accessory flagellum was 10- articulate, antenna 1 was 26-articulate, and antenna 2 was 57-articulate. Further, the juvenile had more pronounced crenulation of the posterior margin of the basis on pereopods 5–7. Feeding and distribution. This species is a benthopelagic scavenger, which is well documented by its rapid aggregation and feeding at baited the camera landers (Fig. 6a; Hessler et al. 1978). As with Eurythenes plasticus, individuals of E. atacamensis sp. nov. have been previously documented to ingest microplastics (Jamieson et al. 2019; Weston et al. 2020a). Eurythenes atacamensis sp. nov. has a wide bathymetric range (>3000 m) across abyssal to hadal depths (4974–8081 m), including the deepest point of the Atacama Trench. This species is considered to have a distribution localized to both sectors of the Peru-Chile Trench. Eurythenes atacamensis sp. nov. is a prominent member of a wider scavenging amphipod community (Fujii et al. 2013). This community is comprised of three species also endemic to the Peru-Chile Trench, Hirondellea thurstoni Kilgallen, 2015, Hirondellea sonne Kilgallen, 2015, and Hirondellea wagneri Kilgallen, 2015. Differential diagnosis. In a genus with cryptic speciation (Havermans et al. 2013), Eurythenes atacamensis sp. nov. has distinct diagnostic features. These features include a smooth dorsal body, the palm of gnathopod 1 being very short, and the palm of gnathopod 2 being minutely chelate with an obtusely angled palm. Eurythenes atacamensis sp. nov. is the most similar morphologically to Eurythenes thurstoni Stoddart & Lowry, 2004, as they both have a minutely chelate gnathopod 2. Yet, E. atacamensis sp. nov. can be readily differentiated by the lack of an upturned ridge on the anterodorsal margin of head (present in E. thurstoni), uropod 2 inner ramus longer than outer ramus (opposed to subequal), and small tooth on the posteroventral corner of epimeron 3 (versus subquadrate). Eurythenes thurstoni is also smaller in total body size, most commonly not longer than 35 mm (Stoddart and Lowry 2004). Additionally, the two species have a disjunct vertical distribution, where E. thurstoni lives at bathyal depths (Stoddart and Lowry 2004; d’ Udekem d’ Acoz and Havermans 2015).

The lysianassoid species Eurythenes thurstoni Stoddart & Lowry, 2004 is recorded for the first time to the Southern Atlantic Ocean, with material collected from the South Mid-Atlantic Ridge during the MAR-ECO Project expeditions. The examined material presents some important variations when compared with the original description discussed in the text.

Family EURYTHENEIDAE n. fam. DIAGNOSIS. — Head exposed, much deeper than long, not extending much below insertion of antenna 2, without cheek notch. Antennae with calceoli present in male, absent in female. Antenna 1 with well developed two-field callynophore in male and female. Antenna 2 peduncular article 3 without distal hook. Mouthpart bundle subquadrate. Epistome and upper lip separate. Mandible incisors present, well developed, symmetrical, convex, smooth; right lacinia mobilis absent; accessory setal row without distal setal tuft; molar a setose tongue, with small triturating surface; palp present, inserted approximately mid-anteriorly. Maxilla 1 inner plate with more than two apical pappose setae; outer plate narrow with setal-teeth in 8/3 crown arrangement, setal-teeth large, ST6 and ST7 slender, ST7 slightly displaced from ST6; palp large, with apical robust setae. Maxilla 2 inner plate significantly shorter than outer plate. Maxilliped outer plate present, medial setae small, blunt or beadshaped; palp four-articulate, article 4 well developed. Gnathopod 1 subchelate to parachelate; coxa vestigial; merus and carpus not rotated; carpus short; propodus large, palm straight to convex; dactylus slightly curved, not hidden by setae. Gnathopod 2 coxa small, shorter than coxa 3. Pereopods all simple; distal spurs absent. Pereopod 3 coxa large. Pereopod 4 coxa large with well developed posteroventral lobe. Pereopod 5 coxa with anterior and posterior lobes subequal. Uropod 2 inner ramus without constriction. Uropod 3 biramous. Telson present, cleft. GENUS INCLUDED. — Eurythenes Smith, 1882. REMARKS Among the amphipods generally considered to be members of the Lysianassoidea, the Eurytheneidae n. fam. occur in the most basal clade, along with the Hirondellea -group, the Opisidae Lowry & Stoddart, 1995, the Podoprionidae Lowry & Stoddart, 1996 and the Uristidae Hurley, 1963 (s.s.). The most common lifestyle in all of these groups (except the Opisidae) is scavenging. In general, species in these groups have callynophores in both sexes, molars in the form of a setose tongue or flap, setal-teeth of maxilla 1 outer plate in a crown arrangement (except in the Podoprionidae), well developed third uropods and a long, deeply cleft telson. There are two forms of crown-type arrangements of the maxilla 1 setal-teeth: the 8/3 crown (Lowry & Stoddart 1995: 140) which occurs fully-formed in the Alicella -group, eurytheneids, opisids and some species of Hirondellea and slightly modified in the Cebocaris -group and Thoriella- group; and the 7/4 crown (Lowry & Stoddart 1992: 186) which occurs in Cyclocaris, Eclecticus and uristids. We suspect that each of these types has arisen independently on more than one occasion. The eurytheneids appear to be the sister taxon to the Hirondellea -group. Species of Hirondellea differ from eurytheneids in having a setose flap molar, a distal setose tuft at the end of the accessory setal row, only two apical setae on the inner plate of maxilla 1 and coxa 2 about the same size as coxa 3. Eurytheneids also appear to be closely related to uristids (s.s.). Most genera in this group have scavenging members. Uristids differ from eurytheneids in having a shorter head, the maxilla 1 setal-teeth in a 7/4 crown and setal-tooth 7 strongly displaced from setal-tooth 6. Many uristids, Hirondellea species and eurytheneids are scavengers. Although opisids have many of the characters of scavenging lysianassoids, they are generally considered to be ectoparasites/micropredators of fishes – a lifestyle probably only one step removed from scavenging. Apparently they share a common ancestor with the scavenging groups and appear to be related to eurytheneids. In opisids the head is not as deep as in eurytheneids, the inner plate of maxilla 1 has two or less apical setae, the outer plate setal-tooth 7 is not displaced from setal-tooth 6, the coxa of gnathopood 1 is large or reduced, but never vestigial as in eurytheneids, and coxa 2 is as large as coxa 3. The podoprionid scavengers also occur in the basal lysianassoid group. They have similarities to the eurytheneids, but their strongly serrate mandibular incisors, non-crown-like setal-teeth arrangement on maxilla 1, strongly chelate first gnathopods and strongly serrate posterior margin on the basis of pereopod 5 easily distinguish them from the eurytheneids. Eurytheneids also share characters with the Alicella -group, but are immediately distinguished from this marginal lysianassoid group by the absence of a lacinia mobilis on the right mandible in Eurythenes., Published as part of Stoddart, Helen E. & Lowry, James K., 2004, The deep-sea lysianassoid genus Eurythenes (Crustacea, Amphipoda, Eurytheneidae n. fam.), pp. 425-468 in Zoosystema 26 (3) on pages 427-428, DOI: 10.5281/zenodo.5395773, {"references":["SMITH S. I. 1882. - Eurythenes Lilljeborg, in SCUDDER S. H. (ed.), Nomenclator Zoologicus. An Alphabetical List of all Generic Names that have been Employed by Naturalists for Recent and Fossil Animals from the Earliest Times to the Close of the Year 1879. I. Supplemental List. II. Universal Index. Government Printing Office, Washington: 135.","LOWRY J. K. & STODDART H. E. 1995. - The Amphipoda (Crustacea) of Madang Lagoon: Lysianassidae, Opisidae, Uristidae, Wandinidae and Stegocephalidae, in LOWRY J. K. (ed.), The Amphipoda (Crustacea) of Madang Lagoon, Papua New Guinea, Part 1. Records of the Australian Museum, Supplement 22: 97 - 174.","LOWRY J. K. & STODDART H. E. 1996. - New lysianassoid amphipod species from Namibia and Madagascar (Lysianassidae Dana, 1849 and Podoprionidae fam. nov.). Bollettino del Museo Civico di Storia Naturale di Verona 20: 225 - 247.","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.","LOWRY J. K. & STODDART H. E. 1992. - A revision of the genus Ichnopus (Crustacea: Amphipoda: Lysianassoidea: Uristidae). Records of the Australian Museum 44: 185 - 245."]}

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