|Heniochus monoceros from Maldives|
G. Cuvier, 1831
Heniochus monoceros can attain a maximum length of 24 centimetres (9.4 in) in males. The body is laterally flattened, with a basic white or yellowish color and a broad middle black band running vertically from the dorsal fin to the pelvic fins. On the head it shows a black mask with white lines and a couple of bony knobs. The nape is brown. The fish's caudal, dorsal fin and the rear part of anal are most commonly bright yellow, while the pelvic fins are black. Adults have a quite short banner. Juvenile fishes are solitary. This species is oviparous. It feeds on coral polyps, small invertebrates and other bottom-dwelling animals.
Masked Bannerfish typically lives in coastal waters and in lagoon among the coral reefs, at a depth of 2–30 metres (6 ft 7 in–98 ft 5 in).
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