Johnrandallia nigrirostris

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Johnrandallia nigrirostris
Johnrandallia nigrirostris.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Chaetodontidae
Genus: Johnrandallia
Nalbant, 1974[1]
Species: J. nigrirostris
Binomial name
Johnrandallia nigrirostris
(T. N. Gill, 1862)[2]
Synonyms [2]
  • Chaethodon nigrirostris (Gill, 1862)
  • Heniochus nigrirostris (Gill, 1862)
  • Johnrandalia nigrirostris (Gill, 1862)
  • Pseudochaetodon nigrirostris (Gill, 1862)
  • Sarothrodus nigrirostri Gill, 1862

Johnrandallia nigrirostris, the blacknosed butterflyfish or barberfish (from the Spanish names, El Barbero or Mariposa Barbero, "the barber" or "butterfly barber"), 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.[3] 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.


This species has a silvery-yellow, compressed body,[4] and grows to 20.3 centimetres (8.0 in). It is marked with black bands along the base of its dorsal fin, and on its snout and forehead. It has a small protractile mouth with a black, burglar-like mask around its eyes. Johnrandallia nigrirostris has brush-like teeth.[3] It is superficially similar to Prognathodes carlhubbsi and P. falcifer, which also are native to the East Pacific.[5]


Johnrandallia nigrirostris is found in the Eastern Pacific from the Gulf of California to Panama, including the Cocos Island, Malpelo Island and the Galápagos Islands.[3][4] It has also been recorded in Peru.[6]


This species lives at depths ranging from near the surface to 40 metres (130 ft). It inhabits coral reefs and rocky areas.[3]


Johnrandallia nigrirostris aggregates in small groups. It is highly active during the day, during which time it feeds. At night, it shelters near to the reef's surface. This species is a kind of cleaner fish. It will remain at cleaning stations where infested fishes come to have various crustaceans and other ectoparasites removed.[3]


This species feeds on crustaceans, molluscs, and algae.[3]


  1. ^ "Johnrandallia Nalbant, 1974". Integrated Taxonomic Information System. Retrieved May 11, 2011. 
  2. ^ a b Nicolas Bailly (2010). Nicolas Bailly, ed. "Johnrandallia nigrirostris (Gill, 1862)". FishBase. World Register of Marine Species. Retrieved May 11, 2011. 
  3. ^ a b c d e f SDNHM - Johnrandallia nigrirostris (Barberfish. Mariposa barbero)
  4. ^ a b Johnrandallia nigrirostris, Blacknosed butterflyfish : aquarium
  5. ^ Allen, G. R., and Robertson, R. (1994). Fishes of the Tropical Eastern Pacific. ISBN 978-0-8248-1675-9
  6. ^ Hooker, Y. (1990). Primer registro de johnrandallia nigrirostris, Gill 1862, en el Perú. Boletín de Lima 68: 69-71