Foxiphalus, Barnard, 1979

Andrade, Luiz F., Senna, André R. & Souza-Filho, Jesser F., 2022, First record and a new species of Foxiphalus Barnard, 1979 (Crustacea: Amphipoda: Phoxocephalidae) from the Atlantic Ocean, with two new records of the family from northeastern Brazil, Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 62, pp. 1-13 : 12

Key to world species of Foxiphalus

1. Maxilliped inner plate with two apical robust seta................................2

— Maxilliped inner plate with one apical robust setae...............................3

2. Telson lobes with one apical robust seta.... Foxiphalus potiguara sp.nov.

— Telson lobes with two apical robust setae................................................ .......................................................... F.aleuti Barnard & Barnard,1982

3. Right mandible lacinia mobilis simple or absent ...................................4

— Right mandible lacinia mobilis bifid ......................................................8

4. Epimeral plate 3 posteroventral corner rounded....................................5

— Epimeral plate 3 posteroventral corner produced...................................6

5. Rostrum reaching to the apex of article 2 of antenna .............................. ....................................................... F.slatteryi Jarret & Bousfield,1994

— Rostrum reaching to the middle of article 2 of antenna 1........................ .................................................................. F.cognatus (Barnard,1960)

6. Epimeral plate 3 posteroventral corner bluntly produced ........................ .................................................. F.fucaximeus Jarret & Bousfield,1994

— Epimeral plate 3 posteroventral corner sharply produced......................7

7. Upper lip epistome rounded-falcate,without cusp.................................. ..................................................... F.xiximeus Barnard & Barnard,1982

— Upper lip epistome acute and strongly produced... F.similis (Barnard,1960)

8. Left mandible lacinia mobilis falciform.................................................... .................................................... F.falciformis Jarret & Bousfield,1994

— Left mandible lacinia mobilis regularly bifid..........................................9

9. Uropod 1 peduncle with distal displaced robust seta...........................10

— Uropod 1 peduncle without distal displaced robust seta......................11

10. Uropod 1 peduncle with a weak displaced robust seta............................. ....................................................... F.apache Barnard & Barnard,1982

— Uropod 1 peduncle with an enlarged displaced robust seta..................... ............................................................. F.obtusidens (Alderman,1936)

11. Epimeral plates 2 and 3 posterior margin weakly concave....................... ..................................................... F.golfensis Barnard & Barnard,1982

— Epimeral plates 2 and 3 posterior margin straight................................... ...................................................... F.secasius Barnard & Barnard,1982