Four species of Louisea endemic to southwestern Cameroon, whole animal, ventral view. a Second largest adult male (CW 16.1 mm) of L. edeaensis from Lake Ossa wetland complex (ZMB Crust. 30335) b second largest adult male (CW 14.8 mm) of L. balssi from Man’s Crater Lake Manengouba (ZMB Crust. 30319) c adult male, holotype (CW 18.1 mm) of L. yabassi sp. nov. from Yabassi (ZMB Crust. 21575) d largest adult male, holotype (CW 20.0 mm) of L. nkongsamba sp. nov. from Mt. Nlonako (ZMB Crust. 31618). Scale bars: 11.63 mm (a), 9.61 mm (b), 9.50 mm (c), 11.60 mm (d).