Comprehensive DescriptionRead full entry
| Common names: damselfish (English), gregory (English), castañeta (Espanol), jaqueta (Espanol) |
Stegastes rectifraenum (Gill, 1862)
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; gill rakers 14-18; a single continuous dorsal fin, XII, 15 (rarely 16); anal rays II, 13 (rarely 12 or 14); pectoral rays 20 (rarely 19 or 21); 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 (rarely 19); lateral line incomplete, ends under end of dorsal fin base.
Dark brown, grading to lighter brown on head, with scattered noticeably paler scales on body; most of body scales with blackish margins; fins mainly dark brownish, except pectorals slightly yellowish; juveniles bright blue with darker scale margins, a pair of neon-blue stripes on upper part of head and nape, black ocellated spot at base of soft dorsal junction, and small blue- edged black spot on upper surface of caudal peduncle.
Size: attains length of 13 cm.
Inhabits rocky reefs.
Depth: 0-12 m.
Northern Baja California and the entire Gulf of California south to Acapulco on the Mexican mainland, and rarely in the Revillagigedos.