(Family):Lower jaw with many barbels. Two lowermost pectoral rays free. (Genus):Jaws without tooth. Posterior end of perifacial rim not ending as spine, if spine present shorter than eye diameter. No spine on midline of snout. (Species):Posterior end of perifacial rim forming nearly right angle. Three ridges beneath perifacial rim on preopercle low. Opercular ridge smooth, its posterior end variable, acute or round. Posterior region of lower jaw with a small rectangular ridge. Base of rostral exsertion with a single spine. No nasal spine. No preocular and supraocular spine. A blunt triangular projection present on postocular region. Lower jaw with 16〜18 barbels on one side, longest one bearing branches 72〜73% of HL. Scales in 4 rows, 28〜29+1, 33+1, 26〜27+1, 23+0 (from top to bottom row, + indicates scale on caudal fin), and 3〜4 supplemental scales present between 3rd and 4th rows on axil of pectoral fin.