Seba, Bate, 1862

Tokumori, Daigo, Watanabe, Hiromi Kayama, Tanaka, Katsuhiko, Ohara, Yasuhiko & Tomikawa, Ko, 2025, A new species of the genus Seba (Crustacea: Amphipoda: Sebidae) from a cold seep of Mariana Trench, Zootaxa 5570 (2), pp. 361-370 : 368-369

Key to species of Seba known from depths greater than 1000 m

1 Gnathopod 2 coxa with a prominent tooth at the posterodistal corner............................................. 2

- Gnathopod 2 coxa without a prominent tooth at the posterodistal corner.......................................... 3

2 Mandibular palp article 2 with seta; gnathopod 1 coxa with tooth at the posteroventral corner; uropod 3 proximal article of ramus with dorsal setae............................................................. S. marianaensis sp. nov.

- Mandibular palp article 2 without seta; gnathopod 1 coxa with two teeth at the posteroventral corner; uropod 3 proximal article of ramus without dorsal setae......................................................... S. bathybia Larsen, 2007

3 Coxa 4 smaller than coxae 2 and 3; coxa 5 anterior lobe smaller than posterior one S. longimera Wang, Zhu, Sha & Ren, 2019

- Coxa 4 larger than coxae 2 and 3; coxa 5 anterior lobe larger than posterior one.................................... 4

4 Male gnathopod 2 carpus length 1.2 times of width; uropod 3 ramus with robust setae............. S. profunda Shaw, 1989

- Male gnathopod 2 carpus length 2.3 times of width; uropod 3 ramus without setae............. S. armata ( Chevreux, 1889)