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Mostly black with two white bands running from caudal peduncle and breast to each end of spinous section of dorsal fin. Adults develop a prominent hump on the forehead and a curved horn above each eye, and lose the elongate dorsal filament. Max length : 19.0 cm
Depth range 2 - 20 m Pacific Ocean: Indonesia to the Society Islands, north to southern Japan, south to Rowley Shoals and New Caledonia; throughout Micronesia. This species is usually found in areas of rich coral growth in lagoons and on seaward reef slopes. Animals appear to prefer the shelter of caves rather than open areas. It can be found as single individuals, in pairs, or in aggregations numbering up to 30 individuals. This species feeds on live coral, though it is not known whether this species is reliant on live coral for food.