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Dautzenbergia megacheir (Walker, 1897) Parapleustes megacheir Walker, 1897: 230–232, pl. 18, fig. 4 Sympleustes megacheir: Stebbing 1906: 317; Chevreux 1927: 88–89, pl. 7, figs. 6–12; Stephensen 1944: 5, fig. 1 Dautzenbergia megacheir: Barnard 1961: 106; Diviacco 1982: 632–637, figs. 1–4; Barnard & Karaman 1991: 316; BellanSantini et al. 1998: 822–823, fig. 557; Cartes et al. 2022: 5, figs. 2 & 4 Locus typicus: SW of Ireland, 1372 m water depth. Distribution: North Atlantic: Ireland, 1372 m (Walker 1897), Canary Islands, 1200 m (Chevreux 1927), Greenland, 2448 m (Stephensen 1944); Mediterranean Sea: 650 m (Diviacco 1982),> 1000 m (Cartes et al. 2022). Found on a finely ramose gorgonid (see Stephensen 1944, p. 5) and the bamboo coral, Isidella elongata (see Cartes et al. 2022)., Published as part of Zettler, Michael L., Hendrycks, Ed A. & Freiwald, André, 2022, A new amphipod species of the bathyal genus Dautzenbergia Chevreux, 1900 (Amphipoda, Calliopioidea, Pontogeneiidae) associated with cold-water corals off Angola, pp. 49-63 in Zootaxa 5213 (1) on page 52, DOI: 10.11646/zootaxa.5213.1.3, http://zenodo.org/record/7350062, {"references":["Walker, A. O. (1897) On some new species of Edriophthalma from the Irish Seas. The Journal of the Linnean Society, Zoology, 26 (167), 226 - 232. https: // doi. org / 10.1111 / j. 1096 - 3642.1897. tb 00404. x","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, 1 - 806.","Chevreux, E. (1927) Malacostraces (suite). III. Amphipode. Expeditions scientifiques du \" Travailleur \" et du \" Talisman \" pendant les annees 1880, 1881, 1882, 1883, 9, 41 - 152.","Stephensen, K. (1944) Crustacea Malacostraca. VIII. (Amphipoda IV). Danish Ingolf Expedition, 3 (13), 1 - 51.","Barnard, J. L. (1961) Gammaridean Amphipoda from depths of 400 - 6000 meters. Galathea Report, 5, 23 - 128.","Diviacco, G. (1982) Primo ritrovamento di Dautzenbergia megacheir (Walker) in Mediterraneo e considerazioni sul genere Dautzenbergia Chevreux (Crustacea Amphipoda). Bollettino del Museo Civico die Storia Naturale die Verona, 9, 631 - 640.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Part 1. Records of the Australian Museum, Supplement, 13 (1), 1 - 417. https: // doi. org / 10.3853 / j. 0812 - 7387.13.1991.91","Cartes, J. E., Diaz-Vinolas, D., Gonzalez-Irusta, J. M., Serrano, A., Mohamed, S. & Lombarte, A. (2022) The macrofauna associated to the bamboo coral Isidella elongata: to what extent the impact on isideidae affects diversification of deep-sea fauna. Coral Reefs, 41, 1273 - 1284. https: // doi. org / 10.1007 / s 00338 - 022 - 02243 - w"]}

Dautzenbergia comitari (Myers & Hall-Spencer, 2004) comb. nov. Pleusymtes comitari Myers & Hall-Spencer, 2004: 1029–1032, figs. 1–3 Locus typicus: North Atlantic, off south-west Ireland, Porcupine Bank, 730 m. Distribution: Only known from the type locality, “Twin Mounds” sea mound in water depths between 725–900 m (Myers & Hall-Spencer 2004). Associated with the gorgonian Acanthogorgia sp. Remarks. Myers & Hall-Spencer (2004) placed this species into the genus Pleusymtes (family Pleustidae). However, our study has shown that it cannot be retained in the Pleustidae based on the following atypical and non-pleustid characters: mandibular left lacinia with 5 teeth, mandibular palp article 3 with facial A3 setae not basally clustered; urosome 2 dorsally not shortened; uropods 1–2 rami apices lacking spines and telson incised, lacking a ventral keel. The ventral keel of the telson in pleustids is an important, diagnostic character and the lack of the keel clearly excludes all Dautzenbergia species from that family. We here transfer it to Dautzenbergia, based on the following characters: strongly anteriorly directed, pointed coxa 1; the strongly dissimilar, raptorial gnathopods with gnathopod 2 massive; the toothed dactyls of the pereopods; the long, lanceolate, subequal rami of the uropods lacking apical spines and the incised telson lacking a ventral keel. In combination, these are all characteristic of the genus Dautzenbergia and the five species now included in the genus are very distinctive and form a recognizable, morphological group., Published as part of Zettler, Michael L., Hendrycks, Ed A. & Freiwald, André, 2022, A new amphipod species of the bathyal genus Dautzenbergia Chevreux, 1900 (Amphipoda, Calliopioidea, Pontogeneiidae) associated with cold-water corals off Angola, pp. 49-63 in Zootaxa 5213 (1) on pages 52-53, DOI: 10.11646/zootaxa.5213.1.3, http://zenodo.org/record/7350062, {"references":["Myers, A. A. & Hall-Spencer, J. M. (2004) A new species of amphipod crustacean, Pleusymtes comitari sp. nov., associated with gorgonians on deep-water coral reefs off Ireland. Journal of the Marine Biological Association of the United Kingdom, 84 (5), 1029 - 1032. https: // doi. org / 10.1017 / S 0025315404010367 h"]}

Dautzenbergia dentata (Chevreux, 1919) Sympleustes dentatus Chevreux, 1919: 574; Chevreux 1920: 8; Chevreux 1927: 90–92, pl. 7, figs. 13–26; Stephensen 1944: 4–5 Dautzenbergia dentatus: J.L. Barnard 1961: 106 Dautzenbergia dentata: Barnard & Karaman 1991: 316 Locus typicus: Canary Islands, 946 m. Distribution: North Atlantic: Canary Islands, 946 m (Chevreux 1919, 1920, 1927), Greenland, 740 m (Stephensen 1944)., Published as part of Zettler, Michael L., Hendrycks, Ed A. & Freiwald, André, 2022, A new amphipod species of the bathyal genus Dautzenbergia Chevreux, 1900 (Amphipoda, Calliopioidea, Pontogeneiidae) associated with cold-water corals off Angola, pp. 49-63 in Zootaxa 5213 (1) on page 52, DOI: 10.11646/zootaxa.5213.1.3, http://zenodo.org/record/7350062, {"references":["Chevreux, E. (1919) Note preliminaire sur les amphipodes recueillis par les expeditions du \" Travailleur \" et du \" Talisman \" (1880 - 1883). Bulletin du Museum national d'Histoire naturelle, 25, 574 - 580. https: // doi. org / 10.5962 / bhl. part. 7932","Chevreux, E. (1920) Note preliminaire sur les amphipodes recueillis par les expeditions du \" Travailleur \" et du \" Talisman \" (1880 - 1883) (Fin). Bulletin du Museum national d'Histoire naturelle, 26, 7 - 13.","Chevreux, E. (1927) Malacostraces (suite). III. Amphipode. Expeditions scientifiques du \" Travailleur \" et du \" Talisman \" pendant les annees 1880, 1881, 1882, 1883, 9, 41 - 152.","Stephensen, K. (1944) Crustacea Malacostraca. VIII. (Amphipoda IV). Danish Ingolf Expedition, 3 (13), 1 - 51.","Barnard, J. L. (1961) Gammaridean Amphipoda from depths of 400 - 6000 meters. Galathea Report, 5, 23 - 128.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Part 1. Records of the Australian Museum, Supplement, 13 (1), 1 - 417. https: // doi. org / 10.3853 / j. 0812 - 7387.13.1991.91"]}

Genus Dautzenbergia Chevreux, 1900 Dautzenbergia Chevreux, 1900: 73; J.L. Barnard 1961: 106; Barnard & Karaman 1991: 316 The generic status of the type species of Dautzenbergia has changed frequently. The species was originally placed in Amphithopsis, then to Sympleustes to Dautzenbergia (by Chevreux 1900). Sexton (1909) moved the species back to Sympleustes with the synonymy of Dautzenbergia to Sympleustes. J.L. Barnard (1961) recognized the non-pleustid form of the lower lip and cleft telson and consequently revived and transferred it back to Dautzenbergia. Amended diagnosis. (see Barnard & Karaman 1991 and Bellan-Santini et al. 1998). Antenna 1 longer than antenna 2. Accessory flagellum absent or with a minute article. Head with short rostrum. Body dorsally smooth, urosome 2 not shortened. Coxa 1 strongly directed anteriorly, apically pointed. Gnathopods subchelate, grossly unequal (gnathopod 1 much smaller than gnathopod 2), inner margin of dactylus of gnathopod 1 toothed; carpus of gnathopod 1 subequal to propodus, carpus of gnathopod 2 very short, with small short ventral lobe. Pereopods 3–7 dactyls smooth or toothed, pereopods 5–7 homopodous, basis expanded. Labrum bilobed, slightly incised. Labium with inner lobes small or obsolescent. Maxilla 1 inner plate with few terminal setae (2). Maxilla 2 with inner and outer plates subequal. Mandible with strong columnar, triturative molar, palp article 3 long. Maxilliped, palp 4- articulate, powerful with long dactyl. Uropods long, lanceolate, serially spinose, uropods 1–2 rami apices lacking spines, outer rami not strongly shortened. Telson slightly cleft, not ventrally keeled. Type species. Amphithopsis grandimana Chevreux, 1887: 570–571 Included species. Dautzenbergia includes 5 species: Dautzenbergia grandimana (Chevreux, 1887); Dautzenbergia megacheir (Walker, 1897); Dautzenbergia dentata (Chevreux, 1919); Dautzenbergia comitari (Myers & Hall-Spencer, 2004) new comb.; Dautzenbergia concavipalma sp. nov. Key to Dautzenbergia species 1. Pereopods 3–7, dactyls toothed.......................................................................... 2 - Pereopods 3–7, dactyls smooth.......................................................................... 3 2. Gnathopod 1, propodus narrow, length 2.6 x width; gnathopod 2, propodus posterior margin shorter than palm, palm straight, strongly setose; epimeron plate 3, weakly subquadrate, without posteroventral cusp; telson, oval, length 1.4 x width, split 15 % of length, lobes rounded, without distal inset spine.......................... D. comitari (Myers & Hall-Spencer, 2004) - Gnathopod 1, propodus broad, length 1.6 x width; gnathopod 2, propodus posterior margin subequal to palm, palm evenly convex, lined with small spines; epimeron plate 3, posteroventral corner with a small cusp; telson, subtriangular, length ~ 2 x width, split 9 % of length, lobes slightly angular, with small distal inset spine............ D. grandimana (Chevreux, 1887) 3. Gnathopod 2, propodus dorsal margin strongly convex, length 3.36 x width (female 2.6 x), palm strongly concave and setose, occupying nearly the complete length of the propodus, with a strong tooth at the posteroproximal corner and posterodistal margin with a strong, flanged cusp near insertion of dactylus; pereopod 7, basis broad, length 1.4 x width; telson, length 1.4 x width, split 17 % of length........................................................... D. concavipalma sp. nov. - Gnathopod 2, propodus dorsal margin slightly convex, length 1.8–2.6 x width, palm not occupying the complete length of the propodus, palm not strongly setose, lacking a tooth at posteroproximal corner; pereopod 7, basis narrower, length> 1.5 x width; telson, length> 1.7 x width, split> 20 % of length........................................................... 4 4. Gnathopod 2, propodus palm concave proximally, slightly setose, distal half of palm with 3 tubercles, the first rounded and followed by a deep sinus; pereopod 7, basis length 1.8 x width; telson, length 2.1 x width, split 25 % of length, lobes rounded, lacking distal inset spine.......................................................... D. dentata (Chevreux, 1919) - Gnathopod 2, propodus palm nearly straight proximally, spinose, distal half of palm with 2 tubercles, the first broadly rectangular and preceded by a deep sinus; pereopod 7, basis length 1.5 x width; telson, length 1.8 x width, split 20–25 % of length, lobes pointed, with fine distal inset spine................................................. D. megacheir (Walker, 1897), Published as part of Zettler, Michael L., Hendrycks, Ed A. & Freiwald, André, 2022, A new amphipod species of the bathyal genus Dautzenbergia Chevreux, 1900 (Amphipoda, Calliopioidea, Pontogeneiidae) associated with cold-water corals off Angola, pp. 49-63 in Zootaxa 5213 (1) on pages 51-62, DOI: 10.11646/zootaxa.5213.1.3, http://zenodo.org/record/7350062, {"references":["Chevreux, E. (1900) Amphipodes provenant des campagnes de \" l'Hirondelle \" 1885 - 1888. Resultats des campagnes scientifiques du Prince Albert I de Monaco, 16, i - iv + 1 - 195.","Barnard, J. L. (1961) Gammaridean Amphipoda from depths of 400 - 6000 meters. Galathea Report, 5, 23 - 128.","Barnard, J. L. & Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Part 1. Records of the Australian Museum, Supplement, 13 (1), 1 - 417. https: // doi. org / 10.3853 / j. 0812 - 7387.13.1991.91","Sexton, E. W. (1909) Notes on some Amphipoda from the north side of the Bay of Biscay. Families Pleustidae and Eusiridae. Proceedings of the Zoological Society of London, 1909, 848 - 879.","Bellan-Santini, D., Karaman, G. S., Ledoyer, M., Myers, A. A. & Ruffo, S. (1998) The Amphipoda of the Mediterranean. Part 4. Addenda to Parts 1 - 3. Memoires de l'Institut Oceanographique, Monaco, 13, 815 - 844.","Chevreux, E. (1887) Crustaces amphipodes nouveaux dragues par \" l'Hirondelle \" pendant sa campagne de 1886. Bulletin de la Societe Zoologique de France, 12, 566 - 580. https: // doi. org / 10.5962 / bhl. part. 7932","Walker, A. O. (1897) On some new species of Edriophthalma from the Irish Seas. The Journal of the Linnean Society, Zoology, 26 (167), 226 - 232. https: // doi. org / 10.1111 / j. 1096 - 3642.1897. tb 00404. x","Chevreux, E. (1919) Note preliminaire sur les amphipodes recueillis par les expeditions du \" Travailleur \" et du \" Talisman \" (1880 - 1883). Bulletin du Museum national d'Histoire naturelle, 25, 574 - 580. https: // doi. org / 10.5962 / bhl. part. 7932","Myers, A. A. & Hall-Spencer, J. M. (2004) A new species of amphipod crustacean, Pleusymtes comitari sp. nov., associated with gorgonians on deep-water coral reefs off Ireland. Journal of the Marine Biological Association of the United Kingdom, 84 (5), 1029 - 1032. https: // doi. org / 10.1017 / S 0025315404010367 h"]}

Dautzenbergia concavipalma sp. nov. Figs. 2–8 Diagnosis. Gnathopod 1 propodus subchelate, broadly triangular, length 1.7 x width, palm relatively straight, clearly distinct from posterior margin, dactylus exceeding palm, with inner margin serrated. Gnathopod 2, propodus massive, dorsal margin strongly convex, length 3.36 x width, palm strongly concave, densely setose, occupying nearly the complete length of the propodus, delimited by a strong tooth of the ventrally directed posterior margin and distal margin with a flanged, bidentate cusp near insertion of dactylus, dactylus very powerful, strongly curved, elongate, fitting palm. Pereopods 3–7, dactyls short and strongly curved, inner margins smooth. Pereopod 7 basis short, length 1.4 x width. Epimeron 3 lacking a strong posteroventral tooth. Telson subovate, broad, length 1.4 x width, incised one-sixth of length, lobes not separated. Type material. Holotype: male, 11.0 mm, photographed and figured, (CMNC 2022 -4376), South Atlantic, off Angola, Stn 20927, Buffalo Mound, 9.7003°S, 12.7303°E; water depth 349 m; associated with hexactinellid sponges (Sympagella sp. and Aphrocallistes sp.) within a Desmophyllum pertusum gallery, leg. 21 st January 2016. Allotype: female, 10.8 mm, photographed and figured, (CMNC 2022-4377), data same as holotype. Paratypes: male, 9.2 mm, (CMNC 2022-4378), data same as holotype. 7 specimens, (ZMB 32994), data same as holotype; 2 specimens, (CMNC 2022-4379), South Atlantic, off Angola, Stn. 20913, Anna Ridge, 9.78827°S, 12.77335°E; water depth 307 m, leg. 18 th January 2016; 1 specimen, (ZMB 32995), South Atlantic, off Angola, Stn. 20930, Scary Mound, 9.82287°S, 12.77393°E; water depth 374 m, leg. 22 nd January 2016. Locus typicus. South Atlantic, off Angola, 110 km south-southwest of Luanda, Buffalo Mound, 9.7003°S, 12.7303°E; water depth 349 m. Ambient seawater temperature and oxygen concentration was 11.3°C and 0.76 ml/l. Etymology. The species is named in reference to the strongly concave shape of the palm of the gnathopod 2 (especially in males), which is highly distinctive. Description. Holotype. Male, 11.0 mm, CMNC 2022-4376. Colour (Figs. 2–3). Mostly white, with some light brown highlights in the head, mouthparts and gnathopods. Head (Figs. 2–4). With rostrum weakly developed, eyes prominent, luminescent in the living state; lateral cephalic lobe slightly angular, broad, not projecting strongly. Body (Figs. 2–4). Smooth, lacking dorsal teeth, humps or carinae, urosome 2 not dorsally occluded, subequal in length to urosome 3 (Figs. 4, 8). Antenna 1 (Figs. 2–4, 6). Long, about three-quarters of the body length; peduncular articles short, article 1 sparsely setose dorsally, article 2 three-quarters length of article 1, article 3 short, about two-fifths length of article 2, accessory flagellum absent; flagellum broken but with over 30 remaining articles, normally 40–50 articulate (see Figs. 2–3). Antenna 2 (Figs. 2–4, 6). About two-thirds length of antenna 1, with weak setation, gland cone prominent and acute, extending past peduncular article 3, peduncular articles 4–5 subequal; flagellum ~ 30-articulate. Labrum (Fig. 5). Unevenly bilobed, with a shallow, oblique incision, inner margin of the right lobe finely serrate. Mandible (Fig. 5). Incisor toothed, 6–7 dentate, left lacinia mobilis 5-dentate, right lacinia present and toothed; accessory spine row with 8 (right mandible) and 12 pectinate spines (left mandible); molar subovate, projecting, large and triturative; palp 3-articulate, elongated, article 1 0.44 x length of article 2, article 2 with 8 B2-setae, article 3 long, 1.6 x length of article 2, with 8 A3-setae, the distal third with about 19 fine, comb-like teeth posteroventrally, covered with a row of ~ 18 D3-pectinate setae of equal length and 4 long E3-pectinate setae. Labium (Fig. 5). Outer plates densely setose, distal inner margins slightly excavated. Maxilla 1 (Fig. 5). Inner plate narrowly subovate, finely setose, with two strong and 2 tiny pinnate setae; outer plate with 7 toothed and forked spine-teeth, plate sparsely covered with setae; palp narrow, two segmented with 5–6 stout spines and 5 setae distally. Maxilla 2 (Fig. 5). Inner and outer plates subequal, inner slightly shorter, distally rounded, covered in fine setae, some strong, pinnate setae distally on both plates, inner plate distomedially with 1 strong, pectinate seta. Maxilliped (Fig. 5). Inner and outer plates short, outer plate broader than inner, reaching about 0.3 x length of article 2 of palp, with setae distally and medially; inner plate reaching distal end of article 1 of palp, with 2 stout spines distomedially; palp raptorial, very prominent, 4-articulate, article 2 very long and densely setose medially, article 3 narrow and setose, dactylus falcate, well developed, longer than article 3 and with a distal seta. Gnathopod 1 (Fig. 6). Coxa strongly produced anteriorly in a subacute lobe, basis with long posterior marginal setae; ischium-merus subequal with strong distoventral clusters of setae; carpus length 0.86 x length of propodus, ventral margin densely setose; propodus subchelate, broadly triangular, length 1.7 x width, with several groups of dorsal and ventral marginal clusters of setae, palm relatively straight, distinct from posterior margin, with spines and setae, dactylus slightly exceeding palm, with inner margin serrated. Gnathopod 2 (Fig. 6). Coxa subrectangular, broader than long; basis widening distally, posterior margin with long setae proximally, with a rounded flange/lobe anterodistally; ischium with a rounded flange/lobe on anterior margin; merus twice as long as ischium, with a strong cusp distoventrally; carpus very short, length 0.1 x propodus, cup-shaped, with a very weak distal lobe; propodus powerful, massive, subchelate, subovoid, dorsal margin strongly convex, length 3.36 x width, palm strongly concave, nearly the complete length of the propodus, delimited by a strong tooth of the ventrally directed posterior margin carrying a spine and distal margin with a strong, flanged cusp near insertion of dactylus, palm entirely lined with a dense covering of setae; dactylus very powerful, strongly curved, proximally widened, inner margin smooth, elongate, fitting palm. Pereopod 3 (Fig. 7). Slender; coxa rectangular, length 1.35 x width, ventral margin straight; basis slender, length 5.9 x width, margins with very small spines and long setae anterodistally and posteroproximally; merus slightly longer than carpus, margins weakly spinose; propodus posterior margin with 5 pairs of spines; dactyl short, strongly curved, smooth. Pereopod4(Fig.7).Coxa narrowing ventrally,anterior margin straight, posterior margin excavated,posteroventral lobe small; rest of pereopod as in pereopod 3 except basis with a strong cluster of long setae anteroproximally. Pereopod 5 (Fig. 7). Shorter, 0.89 x length of pereopods 6–7, coxa larger than coxa 6, strongly posterolobate, with anterodistal lobe shallow and broadly rounded, posterodistal lobe slightly narrowed; basis expanded, length 1.46 x width, ovate, anterior margin slightly concave, with small spines and proximally with long setae, posterior margin convex, smooth with minute setules, posterodistal lobe narrowly rounded and not reaching distal margin of ischium; merus about subequal in length to carpus, produced posteriorly into a long pointed lobe, margins spinose; carpus expanded distally, anterior margin with 5 clusters of strong spines; propodus curved, anterior margin with 5 pairs of spines; dactylus short and strongly curved, smooth. Pereopod 6 (Fig. 7). Subequal in length to pereopod 7; coxa with anterodistal lobe narrow, posterodistal lobe broad; basis expanded, length 1.32 x width, ovate, with 5 surface setae, anterior margin with small spines and proximally with long setae, posterior margin convex, smooth with minute setules, posterodistal lobe narrowly rounded and not reaching distal margin of ischium; merus about subequal in length to carpus, produced posteriorly into a long pointed lobe, margins spinose; carpus expanded distally, anterior margin with 5 clusters of strong spines; propodus curved, anterior margin with 5 pairs of spines; dactylus short and strongly curved, smooth. Pereopod 7 (Fig. 7). Subequal in length to pereopod 6; coxa small, subovate; basis expanded, length 1.4 x width, ovate, anterior margin with small spines and proximally with long setae, posterior margin nearly straight, smooth with minute setules, posterodistal lobe broadly rounded and reaching distal margin of ischium; rest of pereopod as in pereopod 6. Gills (Fig. 7). Present on gnathopod 2 to pereopod 6. Subovate, largest on pereopod 4. Epimeron 1 (Fig. 7). Subovate, slightly subacute ventrally, posterior margin convex. Epimeron 2 (Fig. 7). Narrowly subquadrate, ventral margin convex, posterodistal angle very weakly pointed, posterior margin nearly straight. Epimeron 3 (Fig. 7). Subquadrate, ventral margin evenly convex, posterodistal angle very weakly pointed, posterior margin slightly convex. Pleopods 1–3 (Fig. 7). Long, peduncle with ~ 5 proximal clothespin spines; rami lined with marginal plumose setae. Uropod 1 (Fig. 8). Peduncle long, subequal to rami, with marginal spines; rami slender, lanceolate, subequal, with marginal spines, apices lacking spines. Uropod 2 (Fig. 8). Peduncle length 0.74 x outer ramus, both margins spinose; rami slender, lanceolate, outer ramus length 0.95 x inner ramus, both rami margins spinose, apices lacking spines. Uropod 3 (Fig. 8). Peduncle length 0.71 x outer ramus, with 3 marginal spines; rami slender, lanceolate, outer ramus length 0.85 x inner ramus, both rami strongly spinose. Urosome 1–3 (Fig. 8). Urosome 1 length about 2 x length of urosome 2–3 combined, urosome 2 not dorsally occluded. Telson (Fig. 8). Subovate, broad, length 1.4 x width, incised one-sixth (17 %) of length, lobes appressed not open, with hint of small distal notches (appear worn down), likely missing the fine, inset spine. Female.� Allotype, 10.8 mm, CMNC 2022-4377 Similar to male, but differing as follows: Gnathopod 1 (Fig. 6). Dactylus inner margin, serrations are more pronounced. Gnathopod 2 (Fig. 6). Basis widening distally, anterior and posterior margins with long setae; propodus powerful, but smaller than male and less curved, subovoid, length 2.6 x width, palm less concave, posterior marginal tooth delimiting palm smaller than male; dactylus less robust and straighter. Brood plates. Present on gnathopod 2 and pereopods 3–5, largest on pereopod 3, subrectangular, length 3.2 x width, distal end truncated, slightly convex posteriorly, lined with ~ 47 curved brood setae. Telson (Fig. 8). Apices with small distal notches stronger than in male. Ecology. As reported for other species of this genus, Dautzenbergia concavipalma sp. nov. is associated with deep-water corals and their sponge assemblages. Species-coral relationships between Dautzenbergia and azooxanthellate scleractinian corals (Caryophylliidae, Isididae, and Oculinidae) and plexaurid gorgonians have been observed and reported previously (Stephensen 1944, Myers & Hall-Spencer 2004, Cartes et al. 2022 and this study). In contrast to other species of the genus, D. concavipalma sp. nov. occurred in water depths between 300–400 m, i.e. much shallower than previously known. Remarks. Dautzenbergia concavipalma sp. nov. is easily differentiated from all known species by the very distinctive shape and massive size of the propodus of gnathopod 2 (especially in male), with its very strongly concave, setose palm occupying nearly the full length of the propodus and the powerful, strongly curved dactylus. The ventrally directed, strong tooth of the posteroproximal margin of the palm is also very characteristic and does not occur in any of the other congeners. Further, from D. comitari (Myers & Hall-Spencer, 2004), it differs in the much broader propodus of gnathopod 1, length 1.7 x width (vs narrow, length 2.6 x width), the very differently shaped gnathopod 2 and the short, strongly curved, smooth pereopod dactyls (vs toothed dactyls). Dautzenbergia concavipalma sp. nov. is differentiated from D. dentata (Chevreux, 1919) in the broader propodus of gnathopod 1, length 1.7 x width (vs 2.1 x width), the broader basis of pereopods 5–7, basis of pereopod 7 length 1.4 x width, posteroventral lobe broadly rounded (vs 1.8 x width, posteroventral lobe narrowly rounded), and the much shorter and broader telson, length 1.4 x width, incised one-sixth (vs 2.1 x width and widely cleft, greater than one-quarter). From D. grandimana (Chevreux, 1887), our species differs in the smooth pereopod dactyls (vs toothed), the very differently shaped gnathopod 2 and the much shorter and broader telson, length 1.4 x width (vs 2.1 x width). Lastly, D. concavipalma sp. nov. differs from D. megacheir (Walker, 1897) in the broader, subacute distal end of coxa 1 (vs very acutely pointed coxa 1), the different shape of gnathopod 2, the epimeral plate 3 with the posterodistal angle very weakly pointed (vs with a strong tooth at posterodistal corner) and the much shorter and broad telson, length 1.4 x width, incised one-sixth (vs 2.1 x width and cleft, widely, about one-quarter). The peculiar, comb-like structure that we discovered on the inner margin of the distal third of the mandibular palp, article 3 (see Fig. 5) appears to be also shown by Griffiths (1977) for Dautzenbergia grandimana (see Fig. 3, p. 111). Unfortunately, he did not mention this structure and as far as we know, it has never been reported on. It is a difficult structure to observe due to its small size and the palp D3 setae of the inner margin cover it, so may be easily overlooked. The function of this serrated section of the palp is not known, but perhaps it is related to feeding/ grooming or possibly the structure plays a role in the coral relationship. It is unlikely to be related to mating, as the form is present in both males and females. Whether this morphological character is present in all Dautzenbergia species is unknown and until all the mandibles are examined carefully in these species, this question remains unresolved., Published as part of Zettler, Michael L., Hendrycks, Ed A. & Freiwald, André, 2022, A new amphipod species of the bathyal genus Dautzenbergia Chevreux, 1900 (Amphipoda, Calliopioidea, Pontogeneiidae) associated with cold-water corals off Angola, pp. 49-63 in Zootaxa 5213 (1) on pages 53-59, DOI: 10.11646/zootaxa.5213.1.3, http://zenodo.org/record/7350062, {"references":["Stephensen, K. (1944) Crustacea Malacostraca. VIII. (Amphipoda IV). Danish Ingolf Expedition, 3 (13), 1 - 51.","Myers, A. A. & Hall-Spencer, J. M. (2004) A new species of amphipod crustacean, Pleusymtes comitari sp. nov., associated with gorgonians on deep-water coral reefs off Ireland. Journal of the Marine Biological Association of the United Kingdom, 84 (5), 1029 - 1032. https: // doi. org / 10.1017 / S 0025315404010367 h","Cartes, J. E., Diaz-Vinolas, D., Gonzalez-Irusta, J. M., Serrano, A., Mohamed, S. & Lombarte, A. (2022) The macrofauna associated to the bamboo coral Isidella elongata: to what extent the impact on isideidae affects diversification of deep-sea fauna. Coral Reefs, 41, 1273 - 1284. https: // doi. org / 10.1007 / s 00338 - 022 - 02243 - w","Chevreux, E. (1919) Note preliminaire sur les amphipodes recueillis par les expeditions du \" Travailleur \" et du \" Talisman \" (1880 - 1883). Bulletin du Museum national d'Histoire naturelle, 25, 574 - 580. https: // doi. org / 10.5962 / bhl. part. 7932","Chevreux, E. (1887) Crustaces amphipodes nouveaux dragues par \" l'Hirondelle \" pendant sa campagne de 1886. Bulletin de la Societe Zoologique de France, 12, 566 - 580. https: // doi. org / 10.5962 / bhl. part. 7932","Walker, A. O. (1897) On some new species of Edriophthalma from the Irish Seas. The Journal of the Linnean Society, Zoology, 26 (167), 226 - 232. https: // doi. org / 10.1111 / j. 1096 - 3642.1897. tb 00404. x","Griffiths, C. L. (1977) The South African Museum's Meiring Naude Cruises. Part 6. Amphipoda. Annals of the South African Museum, 74 (4), 105 - 123."]}

FS MARIA S. MERIAN Fahrt MSM105 11.01.2022 – 23.02.2022 Walvis Bay – Mindelo BUSUC II Das Benguela-System im Klimawandel - Auswirkungen der Variabilität des physikalischen Antriebs auf den Kohlenstoff- und Sauerstoffhaushalt 3. Wochenbericht 24. - 30.01.2022

Meereswissenschaftliche Berichte No 120 2022 - Marine Science Reports No 120 2022, In 2020, a total of 153 phytoplankton species were recorded on 4 annual monitoring cruisesreported here, marking a species diversity comparable to previous years. Mean annualphytoplankton biomass was lower in 2020 than in 2018 and 2019, but close to the 20-year mean. The spring bloom of 2020 was represented by only two cruises, taking place in February and May, thus missing the peak of the bloom season that is usually captured by the March cruise. As inprevious years, in 2020 a diatom dominated spring bloom started in February at the southern most station in Kiel Bight. While “travelling” successively northward, dominance changed from diatoms (Skeletonema marinoi) to the ciliate Mesodinium rubrum. By May, the now dinoflagellate dominated bloom was already declining. The late spring community contained high biomass shares of small, unidentified gymnodinoids as well as colonialcyanobacteria. The summer phytoplankton community was unusual in 2020 as in the Belt Sea and the Arkona Basin it contained high biomass shares of the diatom Dactyosolen fragilissimus. The toxic invasive dinoflagellate Alexandrium pseudogonyaulax was a dominant species in the Belt Sea. Cyanobacteria dominated the northern Basins, but total phytoplankton biomass was, generally low. The phytoplankton growth period extended well into the autumn when high biomass levels were found in the southern sea areas, made by diatoms of the genera Pseudosolenia, Cerataulina and potentially toxic Pseudo-nitzschia spp. The 2020 phytoplankton sedimentation pattern was similar to the previous year with diatoms dominating the settling matter in spring and autumn and dinoflagellate/cyanobacteria sedimentation pulses occurringin summer.The zooplankton was characterized by a low stock size which continued a series of years of lowstock size that started around 2010. This decline is primarily based on a decreasing abundance of rotifers in spring and cladocerans in autumn, and to a lesser degree on copepods. While the abundance of copepods was lower than usual in the Kiel Bight in 2020, cladocerans and rotifers were less abundant than usual in the Bay of Mecklenburg and the Arkona Basin. The total zooplankton density of 4.8 x 104 ind. m-3 was the lowest value recorded since 20 years and accounts for only 1/6 of the long-term average. Due to the low abundance of rotifers and cladocerans, copepods dominated the zooplankton in all areas, with A. longiremis as a majorspecies. In total, fifty-four different zooplankton taxa were identified in the Kiel Bight, the Bay of Mecklenburg and the Arkona Basin. The species composition resembled the inventory of the previous year with a strong influence of species with a broad salinity tolerance and characteristic of the brackish waters. Nevertheless, halophilic organisms like the copepods Calanus spp., Centropages typicus or the cladoceran Penilia avirostris were regularly observed albeit as single findings. The anthomedusae Lizzia blondina and Staurosarsia gemmifera are non-indigenousspecies and were found in the Bay of the Mecklenburg. The 118 species found in the macrozoobenthos in 2020 mark a low to medium diversity. The species number found at the eight monitoring stations ranged between 10 and 66. In mostregions, the oxygen supply in bottom waters in the current year was always higher than 2 ml/l. However, in the Mecklenburg Bay we detected oxygen values below 0.5 ml/l in September. After a dramatically decrease of diversity and abundance in the Fehmarnbelt area in 2018, a complete recovering was observed in 2019 and 2020. During the autumn sampling in 2020, the benthic fauna appeared to be affected by the oxygen situation of that year’s summer. At both stations, very low numbers were observed. At all other stations the diversity was similar or slightly increased compared to the last years. Depending on the region, the abundances ranged from293 to 16.230 ind. m-², and the biomass (ash free dry weight) from 0.9 g m-² to 66.4 g m-². Seventeen species of the German Red List (Categories 1, 2, 3 and G) were observed at the eight monitoring stations. With seven, the number of invasive species in 2020 was low. Melita nitida, a species of amphipod, originally from North America and arriving in the southern Baltic Sea around 2013, was observed for the first time at the monitoring station in the Pomeranian Bay. Rhithropanopeus harrisii, also originally from North America, can be observed at the Oderbank since 2006. Finally, as a cryptic neozoan species, the ascidian Molgula manhattensis was observed in the Kiel Bay.

Three species were found from the continental slope off Namibia of which two species are new to science: Nucula kunenensis n. sp. and N. nama n. sp. A comparison was made with morphologically similar eastern Atlantic and South African species in the family Nuculidae. Nucula kunenensis n. sp. was found alive in silty sediment with high organic content in upper bathyal depths off the Kunene region in NW Namibia. Nucula nama n.sp. is only known from a single living individual taken in a similar environment. The two new species have a distinctive ribbing on the prodissoconch which differs both from most coastal Nucula spp. and most of the South African species. We believe this should be emphasized as an indication of a hitherto neglected but apparently useful character of some deep-water Atlantic nuculid species.