Diagnosis: distance snout to origin of dorsal fin 2-2.4 times head length, or 54-62% distance snout to vent (Ref. 52193).

Description: elongated, sub-cylindrical body tapering to a point formed the confluent dorsal and anal fins; filamentous pectoral and pelvic fins (Ref. 13337). Dorsal and anal fins with soft rays only (Ref. 52193). Head robust, body snake-like; mouth large with sharp teeth; soft, cycloid scales; nostrils open under the upper lip, hidden when mouth is closed; gill chamber openings short, restricted to sides in front of pectoral bases; small external gills present above each gill opening; anus behind pelvic base, offset on side of body (Ref. 7248, 52193). 40-50 scales in a longitudinal series between gill opening and vent, 36-40 around the body (Ref. 13337).

Coloration: dark olive-brown on the dorsal surface, the color paling in intensity onto the ventral surface; body covered with irregularly shaped spots (Ref. 13337), usually X-, Y- or V-shaped (Ref. 40587). Lateral line canals form wavy lines over head (Ref. 52193).