AppearanceThis species has a silvery-yellow, compressed body,...hieroglyph snipped... and grows to 20.3 centimetres . 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. It is superficially similar to ''Prognathodes carlhubbsi'' and ''P. falcifer'', which also are native to the East Pacific.
Distribution''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. It has also been recorded in Peru.
Behavior''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.
HabitatThis species lives at depths ranging from near the surface to 40 metres . It inhabits coral reefs and rocky areas.
FoodThis species feeds on crustaceans, molluscs, and algae.
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