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, frontal view of right and left chela. a, b Second largest adult male (CW 16.1 mm) of L. edeaensis from Lake Ossa wetland complex (ZMB Crust. 30335) c, d largest adult male (CW 16.2 mm) of L. balssi from Man’s Crater Lake Manengouba (ZMB Crust. 30319) (missing left p5) (‘Mvogo Ndongo et al. 2018: fig. 3a, b’, www.mapress.com/j/zt) e, f adult male, holotype (CW 18.1 mm) of L. yabassi sp. nov. from Yabassi (ZMB Crust. 21575) g, h largest adult male, holotype (CW 20.0 mm) of L. nkongsamba sp. nov. from Mt. Nlonako (ZMB Crust. 31618). Scale bars: 5 mm (a, c, e, g), 2 mm (b, d, f), 10 mm (h).