Potamocarcinus, H. MILNE EDWARDS, 1853

Magalhães, Célio & Wehrtmann, Ingo S., 2025, Taxonomic revision and distribution of the freshwater crabs of the family Pseudothelphusidae (Decapoda, Brachyura) from Guatemala, with the descriptions of two new species and keys to the species of all genera, Zoosystema 47 (26), pp. 581-615 : 583

KEY TO GUATEMALAN SPECIES OF POTAMOCARCINUS H. MILNE EDWARDS, 1853

1. Carapace with anterolateral margin bearing large, acute teeth ( Fig. 1A, C); G1 with marginal process and mesodistal lobe of apex erected, not folded over apex cavity ( Fig. 1 G-I); cephalic process vestigial, reduced to two low protuberances ( Fig. 1I) .................................................................. Po. armatus H. Milne Edwards, 1853

1’. Carapace with anterolateral margin bearing minute, blunt teeth ( Fig. 2A); G1 with marginal process and mesodistal lobe of apex folded over apex cavity ( Fig. 2E, F); cephalic process bifid, with two distinct spiniform teeth ( Fig. 2F) ............................................................................................................ Po. magnus ( Rathbun, 1896)