Johnrandallia nigrirostris

''Johnrandallia nigrirostris'', the blacknosed butterflyfish or barberfish, is a species of fish in the family Chaetodontidae, the butterfly fishes. It is found in the East Pacific, and it sometimes acts as a cleaner fish. It is the only member of the genus ''Johnrandallia'', named after the ichthyologist John E. Randall, but in the past it was commonly placed in ''Chaetodon''.