HomeMarine aquarium fishAngelfish & butterflyfishScythemarked butterflyfish Scythemarked butterflyfish (Prognathodes falcifer) Scientific name: Prognathodes falcifer Hubbs & Rechnitzer, 1958 The Scythemarked butterflyfish (Prognathodes falcifer) is a marine fish of the family Chaetodontidae. Native range: Eastern Pacific, Santa Catalina Island, southern California, USA to Peru, including the Galapagos Islands. BiologyDorsal spines (total): 12; Dorsal soft rays (total): 19-20; Anal spines: 3; Anal soft rays: 14 - 16Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePrognathodes falciferFamilyChaetodontidae (Butterflyfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Depth range10–150 m (33–492 ft)EnvironmentMarine; reef-associated; depth range 10 - 150 mClimateSubtropicalDistributionEastern Pacific: Santa Catalina Island, southern California, USA to Peru, including the Galapagos Islands.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More angelfish & butterflyfishPajama cardinalfishSphaeramia nematopteraFoureye butterflyfishChaetodon capistratusSpotfin butterflyfishChaetodon ocellatusBank butterflyfishPrognathodes ayaReef butterflyfishChaetodon sedentariusLongsnout butterflyfishPrognathodes aculeatusSee all angelfish & butterflyfish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026