| Common names: surgeonfish (English), cirujano (Espanol), navajón (Espanol) |
Acanthurus nigricans (Linnaeus, 1758)
Whitecheek surgeonfish, Goldrimmed surgeonfish
Body an elongate oval; head profile steep; eye high on the head; mouth small, protrusible, low on head; teeth on jaws fixed, with flattened, notched tips, 8-28 on each jaw; gill rakers 17-19; dorsal rays IX, 28-31; anal rays III, 26-29; pectoral rays 16; pelvic fin I, 5; a single depressible spine fits into a groove on the side of the base of the tail; tail fin concave; scales very small, rough; lateral line complete.
Black or blue-black; with large white blotch below eye; narrow white band encircling mouth; a yellow band, becoming broader posteriorly, at base of dorsal and anal fins; tail fin white with narrow yellow bar posteriorly.
Size: largest specimen, 22 cm.
Habitat: usually seen in shallow water of exposed coral reefs or rocky shores.
Depth: 0-70 m.
Eastern Indian Ocean and the tropical Pacific, mainly at islands; in the eastern Pacific it is known from the tip of Baja California, the SW and SE Gulf of California, southern Mexico, Costa Rica to Ecuador and all the offshore islands.