Abstract
Akysis bilustris, new species, is described from the Xe Kong drainage (a subdrainage of the Mekong River) in southern Laos. It is distinguished from congeners in having a unique combination of the following characters: eye diameter 14.0-17.5% HL, serrae on posterior margin of pectoral spine 2-3 and longer than half width of spine, pectoral fin reaching to or overlapping pelvic-fin base (length 24.5-29.3% SL), adipose-fin base length 14.3-18.3% SL, body depth at anus 11.4-13.8% SL, caudal-peduncle length 19.6-23.4% SL, caudal-peduncle depth 6.7-9.2% SL, caudal fin emarginate, and vertebrae 30-31.
NSTL