Dorsal-fin rays IX, 27-30; anal-fin rays III, 25-27; pectoral-fin rays 15-16. Body black, shading to bright yellow on caudal peduncle; A broad white band from eye to upper lips. Dorsal and aual fins black with a yellow line at base that broadens posteriorly. A large hemispherical yellow spot at pectoral fin base.
habitats
Occurs on outer reef crests and slopes to about 20m depth. Found in shallow exposed areas Usually occurs in small to large aggregations. Feed on filamentous algae.
Distribution
Indo-West Pacific: Indonesia to Philippines and Ryukyu Islands.
Taiwan: South, Lanyu, Lyudao, East.