IUCN threat status:

Vulnerable (VU)

Comprehensive Description

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  Common names: damselfish (English), major (English), castañeta (Espanol), jaqueta (Espanol)
Stegastes beebei (Nichols, 1924)

Galapagos ringtail damselfish,     Southern whitetail major

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 (10-12); a single continuous dorsal fin, XII, 15 (14-16); anal rays II, 13 (rarely 14); pectoral rays 20-21 (rarely 22); 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 with darker scale outlines, often with white band on caudal peduncle, also with a blue iris and white or yellow outer edge of pectoral fin. Juvenile  dark with red nape, upper back and spiny dorsal, and a dark ocellus at rear base of dorsal fin.

Size: grows to 17 cm.

Habitat: common along rocky shores.

Depth: 0-15 m.

Resident populations in the Galapagos Islands, Malpelo and Cocos, vagrants on the coast of Costa Rica and in the Pearl Islands, Panama.


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© Shorefishes of the tropical eastern Pacific online information system. www.stri.org/sftep

Source: Shorefishes of the Tropical Eastern Pacific Online Information System

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