Species of Potamonemus from southwestern Cameroon, whole animal, dorsal view a largest adult male (CW 29 mm) of P. mambilorum from Mount Nlonako (ZMB Crust. 32428) b adult male (CW 28 mm) of P. mambilorum from small stream on Mount Manengouba (ZMB Crust. 30326) c adult male (CW 31 mm) of P. man sp. nov. from Bakossi National Park (ZMB Crust. 30328) d adult male, holotype (CW 25 mm) of P. man sp. nov. from Man Lake, Mount Manengouba (ZMB Crust. 30320). Scale bars: 15 mm (a), 16 mm (b), 17 mm (c), 16 mm (d).