Appearance
''F. longirostris'' has a compressed yellow body with a black triangular region on its head, and as the name implies, a long, silvery snout. Usually 10 or 11 dorsal spines, a black spot on the anal fin, and rows of small black spots on the breast are found. The fish grows to about 22 cm in length. In comparison, ''F. flavissimus'' has more dorsal spines, lacks the black spots, and its operculum is more curved.Rarely, ''F. longirostris'' can be found in an all-black form, as well, or the yellow portion may be brown.
Behavior
''F. longirostris'' is a diurnal omnivore, feeding mostly on small crustaceans, tube feet of echinoderms and sea urchins, and polychaete tentacles. Like other butterflyfish species, longnose butterflyfish mate for life.References:
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