Taxonomic revision of the endemic Cameroonian freshwater crab genus Louisea Cumberlidge, 1994 (Crustacea, Decapoda, Brachyura, Potamonautidae), with descriptions of two new species from Nkongsamba and Yabassi

Four species of Louisea endemic to southwestern Cameroon, whole animal, dorsal view. a Second largest adult male (CW 16.1 mm) of L. edeaensis from Lake Ossa wetland complex (ZMB Crust. 30335) (missing left p4) b second largest adult male (CW 14.8 mm) of L. balssi from Man’s Crater Lake Manengouba (ZMB Crust. 30319) (missing left p4 and right p2) c subadult male, paratype (CW 13.8 mm) of L. yabassi sp. nov. from Yabassi (ZMB Crust. 21575) (missing left p2–p4, and right cheliped and p2–p5) d second largest adult male (CW 18.38 mm) of L. nkongsamba sp. nov. from Mt. Nlonako (ZMB Crust. 31618). Scale bars: 12.42 mm (a), 10 mm (b), 8.42 mm (c), 11.63 mm (d).