Lepechinella Stebbing 1908

• Main Authors: Johansen, Per-Otto, Vader, Wim
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Dexaminidae; Lepechinella; Arctic; Greenland; Johansen; Chevreux; Thurston; Humps; Iceland; North Atlantic; Spitzbergen
• Online Access: https://dx.doi.org/10.5281/zenodo.3794775; https://zenodo.org/record/3794775

Genus Lepechinella Stebbing, 1908 Lepechinella Stebbing, 1908: 344–346, plate XVI. Dorbanella Chevreux, 1914: 1–4, figs 1–3. Diagnosis The characters given in the diagnosis of the genus Lepechinella by Sittrop & Serejo (2009: 475) are: “Body with projections on the dorsal midline; cephalic tooth divided into two cusps pointed anteriorly; upper lip bilobate; mandible with palp, article 2 of palp of mandible longer than article 3, incisor process dentate, lacinia mobilis dentate, molar triturative; article 2 of palp of maxilla 1 expanded distally; inner plate of maxilla 2 narrower than outer plate; article 2 of palp of maxilliped longer than articles 1 and 3 combined; peraeopods 3 to 7 slender, all articles elongated, except for article 3”. Key to the species of Atlantic and Arctic Lepechinella 1. Peraeon segment 1 without dorsal teeth ……………………………………………………………2 – Peraeon segment 1 with 1 or 2 dorsal teeth (may be small) ……………………………………3 2. Coxal plate 3 clearly bifid; peraeon segment 4 with dorsal tooth …………………………………… ………………………… L. campensis Sittrop & Serejo, 2009. Campos Basin slope, coast of Brazil – Coxal plate 3 not bifid; peraeon segment 4 dorsally smooth ………………………………………… …………………………… L. laurensi Sittrop & Serejo, 2009. Campos Basin slope, coast of Brazil 3. Peraeon segment 1 with a single dorsal tooth … L. skarphedini Thurston, 1980. East Iceland Basin – Peraeon segment 1 with 2 dorsal teeth (may be small) ……………………………………………4 4. Dorsal teeth on peraeon segment 1 small ……………………………………………………………5 – Dorsal teeth on peraeon segment 1 well-developed …………………………………………………6 5. Gnathopod 1 very slender, carpus much longer than propodus; not heavily setose dorsally ……………………………………………………… L. grimi Thurston, 1980. East Iceland Basin – Gnathopod 1 moderately slender, carpus and propodus subequal in length. Heavily setose along dorsal midline … L. hirsuta Sittrop & Serejo, 2009. Campos Basin slope, coast of Brazil 6. Urosome segments 2–3 not fused ……………………………………………………………………7 – Urosome segments 2–3 fused ………………………………………………………………………8 7. Coxal plate 1 bifid, both lobes with serration; Pleon segments 1–3 with 1 large and 1 smaller dorsal tooth …………… L. eupraxiella (Barnard, 1973). Between Spitzbergen and Greenland – Coxal plate 1 bifid, both lobes with smooth margins; Pleon segments 1–3 with one large and two smaller dorsal teeth ……… L. chrysotheras Stebbing, 1908, North of British Isles 8. Coxal plate 1 long, acute, not bifid …………… L. echinata Chevreux, 1914. Bay of Biscay – Coxal plate 1 clearly bifid ……………………………………………………………………………9 9. Pleon segments 1–3 with one large dorsal tooth only …… L. victoriae sp. nov., South of Iceland – Pleon segments 1–3 with additional dorsal teeth, besides the large posterior one ………………10 10. Pleon segments 1–3 with several smaller teeth (or humps) besides the large posterior one ……11 – Pleon segments 1–3 with one smaller tooth (or hump) besides the large posterior one ………12 11. Coxal plate 3 clearly bifid, with posterior lobe small, but acute. Uropod 1 rami subequal …………………………………………………………… L. manco Barnard, 1973. Mediterranean – Coxal plate 3 acute, posterior lobe vestigial. Uropod 1 inner ramus clearly shorter (65 %) than outer ramus ……………………………………… L. helgii Thurston, 1980. East Iceland Basin 12. Coxal plate 4, width 2x the width of basis ………………………………… L. norvegica sp. nov. – Coxal plate 4, width 3–4x the width of basis ……………………………………………………13 13. Peraeopod 7 carpus 1.2x propodus, coxal plate 7 posterodistal corner rounded, posterior margin of peraeopod 7 basis with spines …… L. schellenbergi Stephensen, 1944, Western Greenland – Peraeopod 7 carpus is 1.6x propodus, coxal plate 7 parallelogram shaped with acute posterodistal corner, posterior margin of peraeopod 7 basis with setae…………………… ………………………………………………… L. arctica (Schellenberg, 1926), Arctic Polar Basin The most important differences between L. arctica, L. schellenbergi and L. norvegica sp. nov. are shown in Table 1. : Published as part of Johansen, Per-Otto & Vader, Wim, 2015, New and little known species of Lepechinella (Crustacea, Amphipoda, Lepechinellidae) and an allied new genus Lepesubchela from the North Atlantic, pp. 1-35 in European Journal of Taxonomy 127 on pages 4-6, DOI: 10.5852/ejt.2015.127, http://zenodo.org/record/3785109 : {"references": ["Stebbing T. R. R. 1908. On two new Species of Northern Amphipoda. Journal of Linnean Society London, Zoology 30: 191 - 197. http: // dx. doi. org / 10.1111 / j. 1096 - 3642.1908. tb 02133. x", "Chevreux E. 1914. Diagnoses d'Amphipodes Nouveaux Provenant des Campagnes de la Princesse- Alice dans l'Atlantique nord. Bulletin de l'Institut Oceanographique, Monaco 296: 1 - 4.", "Sittrop D. J. P. & Serejo C. S. 2009. Three species of the genus Lepechinella (Amphipoda: Gammaridea: Lepechinellidae) collected from Campos Basin slope, RJ, Brasil. Scientia Marina 73 (3): 473 - 485. http: // dx. doi. org / 10.3989 / scimar. 2009.73 n 3473", "Barnard J. L. 1973. Deep-sea Amphipoda of the Genus Lepechinella (Crustacea). Smithsonian Contributions to Zoo 1 ogy 133, Smithonian Institution Press, Washington. http: // dx. doi. org / 10.5479 / si. 00810282.133", "Stephensen K. 1944. Crustacea Malacostraca VIII (Amphipoda IV). Danish Ingolf-Expedition 3 (13): 1 - 51.", "Schellenberg A. 1926. Die Gammariden der Deutschen Sudpolar-Expedition 1901 - 1903. Deutsche Sudpolar-Expedition 18: 235 - 414."]}