IUCN threat status:

Least Concern (LC)

Comprehensive Description

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Description

  Common names: butterflyfish (English), mariposa (Espanol)
 
Johnrandallia nigrirostris (Gill, 1862)


Barberfish butterflyfish,     Blacknose butterflyfish



Body a strongly compressed oval disc; mouth small, at end of a short, pointed snout that is ~ 33% head length; teeth long and slender; dorsal fin with XII spines, 4th  spine longest, spines decreasing in size behind that one, 24-25, membranes between anterior dorsal spines moderately incised;  anal rays III, 18-20, 2nd  anal spine longer than 3rd; rear edges of dorsal and anal fins rounded; tail edge straight; lateral line complete, with 52-63 scales; scales rough, covering dorsal and anal fins as well as head and body.



Yellow with black bands on snout, across eyes and forehead, and along base of dorsal fin; also a black area around eye; edge of gill cover black.


Maximum size, 20 cm.


Habitat: usually seen in small to very large aggregations on reefs.

Depth: 5-40 m.

The central Gulf of California to central Peru, also all the offshore islands.
   

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© Shorefishes of the tropical eastern Pacific online information system. www.stri.org/sftep

Source: Shorefishes of the Tropical Eastern Pacific Online Information System

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