About Chaetodon oxycephalus Bleeker, 1853
The Spot-naped Butterflyfish (Chaetodon oxycephalus), also called the pig-face butterflyfish, is a species of marine ray-finned butterflyfish in the family Chaetodontidae. It occurs in the Indo-West Pacific region, ranging from Sri Lanka to Queensland, Australia, and northwards to Indonesia and the Philippines. This species reaches a maximum total length of 25 cm (9.8 inches). Its body is white, with thin vertical lines along the sides and a large black patch on the upper back. It is very similar to the Lined Butterflyfish (C. lineolatus), but can be distinguished by its vertical black eyestripe that is broken above the eye, and the presence of additional black and orange markings in its yellow dorsal and caudal fins. Spot-naped Butterflyfish inhabit coral-rich areas and clear waters on seaward reefs, at depths between 10 and 40 meters. Their diet consists of coral polyps and sea anemones.
