Potamonautidae, Bott, 1970

Cumberlidge, Neil & Reed, Sadie K., 2004, Erimetopus vandenbrandeni (Balss, 1936) n. comb., with notes on the taxonomy of the genus Erimetopus Rathbun, 1894 (Brachyura: Potamoidea: Potamonautidae) from Central Africa, Zootaxa 422 (1), pp. 1-27 : 6

Key to the African genera of Potamonautidae (modified from Cumberlidge 1999)

1 Anterolateral margin with intermediate tooth between exorbital and epibranchial teeth ....................................................................................................................................... 2

– Anterolateral margin lacking intermediate tooth between exorbital and epibranchial teeth ....................................................................................................................................... 4

2 Terminal article of gonopod 1 directed outward (tip pointing laterally); terminal article of gonopod 2 very short (about 0.05–0.07 times as long as subterminal segment of gonopod 2); postfrontal crest complete, lateral ends meeting anterolateral margins.... 3

– Terminal article of gonopod 1 directed inward (tip pointing medially); terminal article of gonopod 2 a long flagellum (about 0.5Ð0.75 times as long as subterminal segment of gonopod2); postfrontal crest incomplete, lateral ends not meeting anterolateral margins .................................................................................................................. Liberonautes

3 Exopod of third maxilliped lacking flagellum ....................................... Potamonemus

– Exopod of third maxilliped with long flagellum .................................... Sudanonautes

4 Terminal segment of mandibular palp simple, with either small ledge or no anterior process at all ................................................................................................................. 5

– Terminal segment of mandibular palp distinctly bilobed, with large anterior lobe ........ ........................................................................................................................... Louisea

5 Carapace outline transversely oval; anterolateral margin of carapace between exorbital and epibranchial teeth smooth; outer margin of carpus of cheliped lacking teeth; carpi and propodi of pereopods P2–P5 lacking spines on their margins ......... Potamonautes

– Carapace outline subhexagonal; anterolateral margin between exorbital and epibranchial teeth with row of small teeth; outer margin of carpus of cheliped with 2 or 3 teeth; carpi and propodi of pereopods P2–P5 with spines on their margins ................... ..................................................................................................................... Erimetopus