Body oblong, thick; head relatively long and slender; wide and convex between eyes; nasal organ a short papilla with 2 small holes at end; eyes high on sides of head; jaws are a beak composed of 4 fused heavy powerful teeth with a central suture on each jaw; a slit-like gill opening in front of the pectoral fin base; a single short- based dorsal fin at rear of body; a similar-shaped anal fin with origin under or behind last few dorsal rays; dorsal rays 8, anal rays 7; pectoral 14-15; no pelvic fins; no spines in the fins; tail fin bluntly straight, with 10 main rays; tough scaleless skin, skin spines over almost entire body and head, including snout to before nostrils, and tail base; no skin flaps.
Dark olive brown above, paler below; dark spots above eye and scattered along flank behind pectoral; indistinct pale lines on upper surface: 1 between front borders of eyes, 1 between rear borders of eyes, 1 angling down along back above pectorals and joining a short line from dorsal origin, sometimes lines behind dorsal, an indistinct pale oval on center top of back; dorsal fin with dark base; inner 1/3 of tail olive, outer 2/3 black, margin pale; anal clear; pectoral clear, narrow dark bar at base.
Size: 17 cm.
Habitat: demersal on soft bottoms.
Depth: 5-118 m.
The tip of Baj and the Gulf of California to Peru.