group Scaly finned fishes fish chactodon setifer fasiatus trifasciatus heniochus macrolepidotus holacanthus diacanthus imperator
Heniochus is a genus of fish in the family Chaetodontidae. The Moorish idol, Zanclus cornutus is similar in appearance but unrelated. The butterflyfish are a group of conspicuous tropical marine fish of the family Chaetodontidae; the bannerfish and coralfish are also included in this group. Found mostly on the reefs of the Atlantic, Indian and Pacific Oceans, there are approximately 120 species in 10 genera. A number of species pairs occur in Indian and Pacific ocean, members of the huge genus Chaetodon, and their taxonomy has often been confused by whether these should be considered species or subspecies. Recent work using DNA sequence data has resolved many of these questions. Also, numerous subgenera have been proposed for splitting out of Chaetodon, and it is becoming clear how the genus ought to be subdivided if that is desired. Butterflyfish look like smaller versions of angelfish (Pomacanthidae) but unlike these lack preopercle spines at the gill covers. Some members of the genus Heniochus resemble the Moorish Idol (Zanclus cornutus) of the monotypic Zanclidae. Among the paraphyletic "Perciformes", the former are probably not too distantly related to butterflyfish, whereas the Zanclidae seem far less close.
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