Lepechinella Stebbing 1908
Creators: name: Johansen, Per-Otto
name: Vader, Wim
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Dexaminidae
Lepechinella

description: 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.
description: 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