Cá Chình hậu môn trước

Diagnosis. Pectoral fin present; dorsal-fin origin slightly anterior to pectoral-fin base, predorsal length 10.7 – 13.1 % TL; anus anterior, below tip of pectoral fin, preanal length 15.9 – 18.9 % TL; trunk very short, 2.8 – 5.5 % TL; two intermaxillary teeth; 4 compound teeth on vomer; single row of 9 – 11 large compound teeth on lower jaw; head pores: IO 4, SO 3; M 6; POP 0; AD 1, F 0, ST 0; lateral-line pores: predorsal 3 – 6, prepectoral 6 – 9, preanal 8 – 12, total 57 – 75, the last at posterior two-thirds of total length; MVF 8 - 14 - 124, total vertebrae 119 – 128 (119 – 130 in Robins & Robins, 1989). Body light brown to blackish dorsally, paler ventrally. Dorsal fin and most part of anal fin white; posterior margin of anal fin with black and white color. Caudal fin black with upper margin white.