Body oval, compressed; 1 pair of nostrils; margin of preopercle serrated; margin of bone under eye serrated, without notch it and the bone before it; mouth small, protrusible; teeth in single row, long and close-set; lower gill rakers 11 (rarely 12); a single continuous dorsal fin, XII, 14 (rarely 15); anal rays II, 12; pectoral rays 22-23 (rarely 24); no projecting short spines at upper and lower base of tail fin; caudal fin bluntly forked; scales are moderately large and rough; body scaled, head largely scaled (snout scaled to nostrils), as are the basal parts of the median fins; lateral-line scales 20; lateral line incomplete, ends under end of dorsal fin base.
Light brown to grey-brown, with blackish scale outlines, head often with violaceous markings; taill fin, rear part of dorsal and anal fins, pelvic fins, and pectoral fins yellowish, although; juveniles bright yellow with broad blue area on back and upper part of head, also has black ocellated spot at soft dorsal junction.
Size: attains 15 cm.
Inhabits rocky shores.
Depth: 1-38 m.
The central Gulf of California to northern Peru, also the Revillagigedos, Cocos and the Galapagos.