Protorchestiidae, Myers and Lowry, 2020

Myers, Alan A., Park, Eunji & J. - P, Olivier, 2025, A revision of the family Protorchestiidae (Amphipoda: Talitroidea) with the description of two new subfamilies, three new genera and one new species, Zootaxa 5725 (3), pp. 371-390 : 388

Key to genera of world Protorchestiidae

1. Uropod 1 exopodite with marginal robust setae.................................................. Cochinorchestia

- Uropod 1 exopodite without marginal robust setae........................................................... 2

2. Male gnathopod 2 palm entire, evenly convex. Female oostegite setae with simple, curl or coil tips.................... 3

- Male gnathopod 2 palm irregular, with cusps and or excavations. Female oostegite setae with multifurcate tips. Microrchestia

3. Female gnathopod 1 with palmate lobe on merus............................................................ 4

- Female gnathopod 1 without palmate lobe on merus................................................... Eorchestia

4. Antenna 1 not reaching beyond end of peduncular article 4 of antenna 2. Antenna 2 peduncle incrassate, article 4 much longer than wide................................................................................. Protorchestia

- Antenna 1 reaching or over-reaching midpoint of peduncular article 5 of antenna 2. Antenna 2 peduncle weakly expanded, article 4 not much longer than wide....................................................................... 5

5. Telson distally narrow, widest proximally, Female oostegites with curled-tip setae.................................. 6

- Telson distally broad, widest medially. Female oostegites with coiled-tip setae.................. Lowryorchestia gen. nov.

6. Telson lobes separated distally......................................................... Serejorchestia gen. nov.

- Telson distally entire............................................................ Richardsonorchestia gen. nov.