P. robustus:

FMNH 68001, holotype, 215.5 mm SL; Borneo: Sabah, Kinabatangan River at Deramakot . FMNH 68002; 1 paratype, 203.4 mm SL; FMNH 68040, 1 paratype, 253.3 mm SL; Borneo: Sabah: Kinabatangan River at Deramakot . ZRC 45497 (2), 108.3-122.0 mm SL; Borneo: Sabah, Kinabatangan River at Pekan Bukit Garam (Pangkalan) .