Fishes of Japan(Nakabo, 2002)
Dorsal rays XIII, 12-15; Anal rays II, 12-13; pectoral rays 17-19; lateral-line scales 18-19; Gill rakers 19-21; body depth 2.3-2.5 in standard length. Body moderate to slender. Posterior margin of preopercle smooth. No scales on infraorbitals; cheek with 3 rows of scales. Two basic color phases: body dark with white transverse band on middle of body and caudal peduncle, and a yellow bar on gill cover; and yellowish with a blue band from above eye to upper caudal peduncle.
Inhabits surge channels, exposed reef flats and upper submarine terrace, at depth of 0 to 12m. Territorial but occurs in groups. Feeds on benthic algae and small crustaceans.
Widely distributed in the Indo-Pacific from East Africa to Marquesan and Society Islands, north to Japan, south to Australia. Throughout Micronesia. It is a common species in Taiwan except weastern part.
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