Body relatively deep (50-57% of SL); head short, pointed (20-27% of SL); eyes on left side, top eye at top edge of head space between eyes very narrow, the ridge over each eye coalesced; mouth very small, 23-26% of head, ends under front edge of eye; jaws on blind side arched; most of teeth on blind side, in 1 row on each jaw, none enlarged; lower gill rakers 6-10; dorsal rays 75-89; anal rays 59-70; base of eye side pelvic on midline of body, 6 pelvic fin rays; pectoral fin 50-75% of head length; tail fin with blunt angular point; urinary papilla on blind side, immediately behind anus; lateral line starts at top corner of operculum, complete, relatively straight; scales small, rough, easily dislodged, without small accessory scales; 43-48 lateral line scales.
Dark brown, with narrow black scale margins; median fins dusky blackish; males often with dark pigment on rear half of blind side.
Size: to 22 cm.
Inhabits soft mud and sand bottoms.
Depth: 1-65 m.
Present in both the West Atlantic and eastern Pacific; in our area from central Baja California to the Gulf of California to Peru.