(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 shroter than eye diameter. No spine on midline of snout. (Species):Posterior end of perifacial rim forming obtuse angle. Three ridges beneath perifacial rim on preopercle low, with serrations backwardly directing. Opercular ridge with 3 spinous projections. Posterior region of lower jaw with a small rectangular ridge. Near base of rostral exsertion and nasal with a single small spine respectively. No preocular and supraocular spines. Two postocular spines present. Lower jaw with 22〜24 barbels on one side, longest one bearing branches 69% of HL. Scales in 4 rows, 28+1, 33+1, 25+1 23+0 (from top to bottom row, + indicates scale on caudal fin), and one supplemental scale present between 3rd and 4th rows on axil of pectoral fin.
Distribution:
From Venezuela to northern Brazil. (Uyeno and Sato)