Oxymonacanthus longirostris

Harlequin filefish | Beaked Leatherjacket | Coral Filefish | Long-nose Leatherjacket | Longnose Filefish
Oxymonacanthus longirostris
Oxymonacanthus longirostris, Male, Ningaloo Reef, Photo: Rick Stuart-Smith
Oxymonacanthus longirostris
Oxymonacanthus longirostris, Female, Maldives, Photo: Rick Stuart-Smith
Oxymonacanthus longirostris
Oxymonacanthus longirostris, adult, Northern Great Barrier Reef, Australia, Photo: Joe Shields
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Oxymonacanthus longirostris
Oxymonacanthus longirostris
Oxymonacanthus longirostris


Tropical Indo-Pacific


Distinctive long-snout and yellow spots forming stripes along green body. Frequently seen in pairs on healthy coral reefs, feeding on staghorn coral polyps.


Max Size: 12 cm

Sea Temperature Range: 20.1-31.4°C

Depth: 1-35m

Habitat Generalization Index: 18.75

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Frequent (19.7% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Few (3 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: extract from RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland