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Naso lituratus (Bloch &. Schneider, 1801)
Black-finned Unicornfish; Clown Surgeonfish; Orange-spine Unicorn; Orange-spine Unicornfish; Orangespine Unicornfish; Pacific Orange-spine Unicorn; Smooth-headed Unicornfish; Stripe-face Unicornfish; Stripe-faced Unicorn Fish; Stripe-faced Unicorn-fish; Acanthurus lituratus Bloch and Schneider, 1801

Life   Vertebrata   Fish   Acanthuridae   Naso

Naso lituratus
© Copyright John Rangall, 2006 · 0
Naso lituratus

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  • Australian Faunal Directory
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Main identification features
  • no horn
  • dark brown; yellow stripe eye to mouth
  • tail base : 2 keels in orange blotches
  • c: yellow margin
Body elongate, oval; snout pointed, slopes at about 45°; adult without horn; teeth small, conical, with tips slightly depressed, smooth or with slight denticulations 2 pairs of large, forward pointing cutting keels on plates on narrow tail base; pelvics I, 3; tail concave, males with long filaments from top and bottom; dorsal VI, 27-30; anal II, 28-30; pectoral 16-17 rays.

Grey brown body and head; lips orange; snout, between eyes and behind mouth black, with yellow edging; nape yellow; dorsal black, grey and white margin; cutting plates on tail base in 2 orange spots; tail black, thin yellow margin; anal orange, thin black and white marginal lines; pelvics yellowish; pectoral dark grey.

Size: 45 cm.

Habitat: reefs and rocky shores; usually in sheltered habitats, although also on exposed outer reefs.

Depth: 0-35 m; juveniles usually 5-15 m; adults usually 5-20 m.

An Indo-Pacific species observed at Clipperton Island.

Abundance: Common.
Cites: Not listed.
Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo).
Depth Range Max: 35 m.
Depth Range Min: 0 m.
Diet: benthic macroalgae.
Eastern Pacific Range: Northern limit=11; Southern limit=11; Western limit=-110; Eastern limit=-110; Latitudinal range=1; Longitudinal range=1.
Egg Type: Pelagic; Pelagic larva.
Feeding Group: Herbivore.
FishBase Habitat: Reef Associated.
Global Endemism: All Pacific (West + Central + East); Indo-Pacific only (Indian + Pacific Oceans); TEP non-endemic; "Transpacific" (East + Central &/or West Pacific); All species.
Habitat: Corals; Reef associated (reef + edges-water column & soft bottom); Rocks; Reef (rock &/or coral); Reef only.
Inshore Offshore: Inshore; Inshore Only.
IUCN Red List: Not evaluated / Listed.
Length Max: 45 cm.
Regional Endemism: Island (s) only; Island (s); Tropical Eastern Pacific (TEP) non-endemic; Eastern Pacific non-endemic; All species.
Residency: Vagrant.
Salinity: Marine; Marine Only.
Water Column Position: Bottom; Near Bottom; Bottom + water column;

Scientific source:

Links to other sites

  • Allen , G.R. and Robertson, D.R., 1997., An Annotated Checklist of the fishes of Clipperton Atoll, Tropical Eastern Pacific., Revista de Biologia Tropical, 45:813-843.
  • Bloch , M. E. and Schneider, J. G., 1801., M. E. Blochii, Systema Ichthyologiae iconibus cx illustratum. Post obitum auctoris opus inchoatum absolvit, correxit, interpolavit Jo. Gottlob Schneider, Saxo. Berolini. Sumtibus Austoris Impressum et Bibliopolio Sanderiano Commissum., Systema Ichthyol., :1-584.
  • Robertson , D.R. and Allen, G.A., 1996., Zoogeography of the shorefish fauna of Clipperton Atoll., Coral Reefs, 15:121-131.
  • Smith , M. M. and Heemstra, P., 1986., Smith's Sea Fishes. Johannesburg: Macmillan South Africa. 1047 pp., Macmillan South Africa:1047pp.


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