Blue tang
Overview
Paracanthurus hepatus is a species of Indo-Pacific surgeonfish. A popular fish in marine aquaria, it is the only member
Monotypic
In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...

 of the genus Paracanthurus. A number of common names are attributed to the species, including regal tang, palette surgeonfish, blue tang (leading to confusion with the Atlantic Acanthurus coeruleus
Acanthurus coeruleus
Acanthurus coeruleus is a surgeonfish found commonly in the Atlantic Ocean.- Description :...

), royal blue tang, hippo tang, flagtail surgeonfish, pacific regal blue tang and blue surgeonfish.

Paracanthurus hepatus has a royal blue body, yellow tail, and black 'palette' design.
 
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