Scott Reef, WA (14°03'S), Ashmore Reef (12°15'S), Timor Sea and northern Great Barrier Reef (12°00'S) to Swains Reef (22°00'S), QLD, also Coringa-Herald Cays, Coral Sea; tropical, Indo-west-central Pacific.
Northeast Province (18), Timor Province (2), Northeast Shelf Province (40), Northeast Shelf Transition (41)
Coral Sea Islands Territory, Territory of Ashmore & Cartier Islands
Fishes of the Great Barrier Reef and Coral Sea(Randall et al.,1990)
Dorsal-fin rays IV-V, 28-30 ; anal-fin rays II, 27-28 ; pectoral-fin rays 17; pelvic-fin rays I,3. Juveniles plain gray and a white peduncle. Adult males with a long anterior to eye which may extend before mouth; adult females with only a prominent bump before eye; adult with two peduncular plates; with a sharp keel ending in a forward-projecting point; head and upper half of body gray, the lower half whitish to pale yellowish, the demarcation irregular; often with a few small pale blue spots behind eye; large males with dark bars on lower side.
Occurs in deep coastal to outer reef slopes, usually in small groups but occasionally in large schools. Adults seen in shallow reef aeras but usually difficult to approach underwater. Feeds on benthic algae.
Indo-Pacific: East Africa to the Marquesan and Society islands; north to the Ryukyus, south to Vanuatu; Palau and Guam in Micronesia. Taiwan: South, Lyudao.
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