Frontal view of the left third maxilliped of adult males of species of Potamonemus from southwestern Cameroon 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). Frontal view of the left mandible of adult males of species of Potamonemus from southwestern Cameroon e largest adult male (CW 29 mm) of P. mambilorum from Mount Nlonako (ZMB Crust. 32428) f adult male (CW 28 mm) of P. mambilorum from small stream on Mount Manengouba (ZMB Crust. 30326) g adult male (CW 31 mm) of P. man sp. nov. from Bakossi National Park (ZMB Crust. 30328) h adult male, holotype (CW 25 mm) of P. man sp. nov. from Man Lake, Mount Manengouba (ZMB Crust. 30320). Scale bars: 5 mm (a–d), 2 mm (e–h).