P. mahakamensis:

RMNH 7838, 2 syntypes, 83.8-84.6 mm SL; Borneo: Mahakam River at Tepoe. CMK 7785 (1), 93.9 mm SL; Borneo: Kalimantan Timur, Mahakam River among boulders upstream of Melak, 0°12'S 115°47'E.