Keponinae Boyko, Moss, Williams & Shields 2013
Creators: name: An, Jianmei
name: Zheng, Wanrui
name: Liang, Jielong
name: Paulay, Gustav
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Bopyridae

description: Key to 29 genera of the subfamily Keponinae (Hemicepon and Metathelges based on immature type specimens are excluded)
1 Abdominal parasites, female with almost smooth lateral plates and pleopods ............................... Rhopalione
- Branchial parasites, female usually with digitate or tuberculate lateral plates and pleopods......................... ... 2
2 All pereomeres of female normally developed ............................................................... 3
- Pereomere 2 of female almost absent ............................................................ Onychocepon
3 One pair of lateral plates on every pleomere of female ......................................................... 4
- Two pairs of lateral plates on every pleomere of female ............................................. .. Cardiocepon
4 Female with some middorsal projections .................................................................... 5
- Female without middorsal projections .................................................................... 13
5 Endopodite of pleopod of female well-developed.......................................................... ... 6
- Endopodite of pleopod of female reduced or absent .......................................................... 10
6 All male pleomere segments distinct ....................................................................... 7
- Some male pleomere segments fused .............................................................. Scyracepon
7 Female with middorsal projection on pleomere 1 ..................................................... Megacepon
- Female without middorsal projection on pleomeres ........................................................... 8
8 Antennae of female as long as body ................................................................... Ergyne
- Antennae of female much shorter than body .......................................................... Allokepon
9 Pleopods of female without endopodites ............................................................ Mesocepon
- Pleopods of female with reduced endopodites ............................................................... 10
10 Middorsal projections only on last 2 pereomeres of female ..................................................... 12
- Middorsal projections on more than last 2 pereomeres of female ................................................ 11
11 Lateral plates and pleopods of female with digitate margins ........................................... Cancricepon
- Lateral plates and pleopods of female with smooth margins........................................... .. Paracepon 12 Pereomere 6 of female with more than one projection .................................................. Tylokepon
- Pereomere 6 of female with one projection ......................................................... Grapsicepon
13 Pleopods of female with well-developed endopodites ......................................................... 14
- Pleopods of female with reduced endopodites .............................................................. 22
14 Tergal projection of female with densely tuberculate surface ............................................ Lobocepon
- Tergal projection of female with almost smooth surface ....................................................... 15
15 Lateral plates and pleopods of female with smooth margins ................................................... 16
- Lateral plates and pleopods of female with digitate margins................................................. ... 18
16 Male with lateral plates........................................................................ .. Procepon
- Male without lateral plates .............................................................................. 17
17 Female with wide lamellar lateral plates, male with slender uropods.................................... .. Coxalione
- Female with narrow striped lateral plates, male with stout uropods.................................... ... Hypocepon
18 Head of female with bilobate anterior margin ............................................................... 19
- Head of female with convex anterior margin ............................................................... 21
19 Lateral plates and pleopods of female covered with tubercles, margins sparsely digitate ....................... Anacepon
- Lateral plates and pleopods of female smooth, margins densely digitate .......................................... 20
20 Female with endopodites of pleopods slightly shorter than exopodites, barbula with 2 pairs of projections ............ Kepon
- Female with endopodites of pleopods much shorter than exopodites, barbula with 3 pairs of projections ....... Dactylocepon
21 Male without pleopods ......................................................................... Metacepon
- Male with pleopods ........................................................................... Heterocepon
22 Female with 5 pairs of biramous pleopods plus uropods ................................................ Castrione
- Female with 5 pairs of uniramous pleopods plus uropods ..................................................... 23
23 Lateral plates of female with largely smooth margins ......................................................... 24
- Lateral plates of female with digitate margins ............................................................... 25
24 Exopodites of pleopods of female slightly shorter than corresponding lateral plates .......................... .. Epicepon
- Exopodites of pleopods of female much shorter than corresponding lateral plates ......................... .. Atypocepon
25 Male with all pleomeres fused ................................................................... Hypercepon
- Male with some pleomeres separated ...................................................................... 26
26 Female with reduced frontal lamina ................................................................ Apocepon
- Female with well-developed frontal lamina ................................................................ 27
27 Frontal lamina of female tuberculate ............................................................... Onkokepon
- Frontal lamina of female smooth ......................................................................... 28
28 Male with long uropods.......................................................................... .. Leidya
- Male with short uropods ...................................................................... Trapezicepon
description: Published as part of An, Jianmei, Zheng, Wanrui, Liang, Jielong & Paulay, Gustav, 2020, Three new species of Scyracepon Tattersall, 1905 (Isopoda: Bopyridae) from Pacific islands, with comments on the rarity of bopyrids parasitizing brachyurans, pp. 151-162 in Zootaxa 4851 (1) on pages 160-161, DOI: 10.11646/zootaxa.4851.1.6, http://zenodo.org/record/4407327