The Pyramid Butterflyfish (Hemitaurichthys polylepis) is a small tropical fish species that is a member of the bright and colourful ‘Butterflyfishes’ fish family Chaetodontidae. This species can be found throughout the Pacific Ocean and its distribution extends from Christmas Island in the eastern Indian Ocean to Indonesia and the Hawaiian Islands, north to the waters of southern Japan and then south to the Rowley Shoals and New Caledonia. A similar looking species Hemitaurichthys zoster is found in the Indian Ocean. This species is easily recognised by its colouration and the pyramid shape on the side of its body. This species can be found occurring on coral reefs where it often forms large schools and feed on plankton carried by currents. The Pyramid Butterflyfish (Hemitaurichthys polylepis) grows to a maximum length of approximately 18cm.