HomeMarine aquarium fishTriggers, puffers & boxfishHarlequin filefish Harlequin filefish (Oxymonacanthus longirostris) Scientific name: Oxymonacanthus longirostris Bloch & Schneider, 1801 The Harlequin filefish (Oxymonacanthus longirostris) is a marine fish of the family Monacanthidae. BiologyDorsal spines (total): 2; Dorsal soft rays (total): 31-35; Anal spines: 0; Anal soft rays: 29 - 32. Ventral rudiment absent; bristles on caudal peduncle of males longer than others on body.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOxymonacanthus longirostrisFamilyMonacanthidae (Filefishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length12.0Depth range4–30 m (13–98 ft)EnvironmentMarine; reef-associated; non-migratory; depth range 4 - 30 mClimateTropicalDistributionIndo-Pacific: East Africa south to Maputo, Mozambique and east to Samoa, north to Ryukyu Islands, south to the southern Great Barrier Reef, New Caledonia, and Tonga. Replaced by Oxymonacanthus halli in the Red Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest; aquarium: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec = 200) More triggers, puffers & boxfishWhite-banded triggerfishRhinecanthus aculeatusWhitespotted boxfishOstracion meleagrisYellow boxfishOstracion cubicusBlack-blotched porcupinefishDiodon liturosusValentin's sharpnose pufferCanthigaster valentiniHoneycomb tobyCanthigaster janthinopteraSee all triggers, puffers & boxfish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026