Campylaspis (Gerken, 2012)

Akiyama, Tadashi, 2025, On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis, Zootaxa 5665 (4), pp. 543-562 : 561

Key to species of Campylaspis and Campylaspenis from the Sea of Japan

1. Carapace without ridges, tubercles or depressions............................................................ 2

- Carapace with ridges, tubercles or depressions.............................................................. 4

2. Maxilliped 3 merus wide............................................................................... 3

- Maxilliped 3 merus narrow................................................ Campylaspis orientalis Calman, 1911

3. Female. Pereopod 1 merus longer than carpus, uropod endopod less than twice as peduncle length........................................................................................ Campylaspis rubicunda (Lilljeborg, 1855)

- Female. Pereopod 1 merus subequal in length to carpus; uropod endopod twice as peduncle length................................................................................................. Campylaspis glabra Sars, 1879

4. Carapace with tubercles on dorsal surface; pleonite 5 narrow at middle region..................................... 5

- Carapace with 3 oblique ridges, without tubercles on dorsal surface; pleonite 5 not narrow at middle region.............. 6

5. Carapace with wide depression on side........................................ Campylaspis clavata Lomkina, 1958

- Carapace with narrow sulcus on side....................................... Campylaspis papillata Lomakina, 1952

6. Maxilliped 3 merus not elongate, basis inner distal corner not projected.......................................... 7

- Maxilliped 3 merus elongate, basis inner distal corner projected................................................ 8

7. 2nd oblique ridge of carapce branch.................................. Campylaspis costata speciosa Lomakina, 1955

- 2nd oblique ridge of carapace not branch....................... Campylaspis vassilenkoae Lavrentiva and Tzareva, 2013

8. Carapace with a transverse ridge on frontal lobe, pseudorostrum upturned, very short............................... 9

- Carapace without transverse ridges on frontal lobe, pseudorostrum normal....................................... 10

9. Female. Oblique ridges on carapace prominent, basis of maxilliped 3 shorter than remaining articles together: Male. Large penial lobes present on pereonite 5.............................. Campylaspenis pism ( Vassilenko and Tzareva, 2004)

- Oblique ridges on carapace weak, basis of maxilliped 3 subequal in length to remaining articles together: Male. Penial lobes absent.............................................................. Campylaspis brevirosttris Akiyama, 2014

10 Female. carapace with minute spines, oblique ridges weak: Male. Large penial lobes present on pereonite 5...................................................................................... Campylaspenis sigeogamoi sp. nov.

- Female. carapace without minute spines, oblique ridges prominent; Male. Penial lobes absent................................................................................................. Campylaspis crispa Lomakina, 1958