Hemitaurichthys polylepis (Bleeker, 1857)
Pyramid butterflyfish
Hemitaurichthys polylepis
photo by Muséum-Aquarium de Nancy/D. Terver

Family:  Chaetodontidae (Butterflyfishes)
Max. size:  18 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 60 m
Distribution:  Pacific Ocean: Christmas Island in the eastern Indian Ocean to Indonesia and the Hawaiian, Line, and Pitcairn islands, north to southern Japan, south to Rowley Shoals and New Caledonia. Replaced by Hemitaurichthys zoster in the Indian Ocean (Ref. 37816).
Diagnosis:  Dorsal spines (total): 12-12; Dorsal soft rays (total): 23-26; Anal spines: 3-3; Anal soft rays: 19-21. Description: Readily identified by unusual coloration (Ref. 48636). Snout length 2.6-2.8 in HL. Body depth 1.5-1.6 in SL (Ref. 90102).
Biology:  Occur in large schools that may extend several meters above the edges of steep current-swept outer reef slopes. Common (Ref. 9710). Benthopelagic (Ref. 58302). Feed on plankton (Ref. 3921). Oviparous (Ref. 205). Form pairs during breeding (Ref. 205).
IUCN Red List Status: Least Concern (LC); Date assessed: 09 October 2009 Ref. (130435)
Threat to humans:  harmless


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