Four species of Louisea endemic to southwestern Cameroon, carapace, dorsal view. a Largest adult male, holotype (CW 20.0 mm) of L. nkongsamba sp. nov. from Mt. Nlonako (ZMB Crust. 31618) b second largest adult male (CW 14.8 mm) of L. balssi from Man’s Crater Lake Manengouba (ZMB Crust. 30319) c second largest adult male (CW 16.1 mm) of L. edeaensis from Lake Ossa wetland complex (ZMB Crust. 30335) d adult male, holotype (CW 18.1 mm) of L. yabassi sp. nov. from Yabassi (ZMB Crust. 21575). Scale bars: 9.1 mm (a), 7.25 mm (b), 7.90 mm (c), 8.62 mm (d).