The Chaetodontidae can be, but are not usually, divided into two lineages that arguably are subfamilies. The subfamily name Chaetodontinae is a little-used leftover from the period when the Pomacanthidae and Chaetodontidae were united under the latter name as a single family. Hence, Chaetodontinae is today considered a junior synonym of Chaetodontidae. In any case, one lineage of Chaetodontidae (in the modern sense) contains the "typical" butterflyfish around "Chaetodon", while the other unites the bannerfish and coralfish genera. As the Perciformes are highly paraphyletic, the precise relationships of the Chaetodontidae as a whole are badly resolved.