P. sympelvica:

ZRC 40359 (holotype), 55.0 mm SL; ZRC 40360 (1 paratype), 55.3 mm SL; Laos: Khammouan province, Nam Theun drainage, Nam Veo, tributary of Nam Phao, 25 km E of Lak Sao. CMK 12257 (3), 54.6-55.4 mm SL; Laos: Khammouan Province, Nam Theun, waterfall about 7 km downriver of NT2 dam site, 18°1'40"N 104°58'54"E. CMK 15231 (1), 62.4 mm SL; Laos: Xiangkhouang Province, Nam Ngum, rapids downstream of Ban Latbouak, 19°36'20"N 103°14'28"E. UMMZ 241107 (1), 43.7 mm SL; Laos: Luang Prabang Province, Nam Khan at Keng Noun (rapids), 10 km E of Luang Prabang .