Largemouth Threefin (species: Ucla xenogrammus) in Lizard Island Field Guide (Lizard Island Field Guide)
Ucla xenogrammus
Largemouth Threefin

©Alexander Semenov: Ucla xenogrammus at Big Vicki's Reef, Lizard Island.

©Rick Stuart-Smith: Ucla xenogrammus, Lizard Island area. Note distinctive protruding lower jaw.

©Rick Stuart-Smith: Ucla xenogrammus, Lizard Island area.
Kingdom Animalia
Phylum Chordata
Class Actinopterygii
Order Perciformes
Family Tripterygiidae
Genus Ucla
Species Ucla xenogrammus



Distinguishing features

Translucent with spine showing through in alternating bands of white and red/brown. Snout pointed and lower jaw protrudes.


  • Up to 5.7 cm (length according to Allen and Erdmann, 2012)

Depth range

  • Depth range data is not yet available.



©Atlas of Living Australia: Australian distribution

Web resources


References that assist with identification

  • Allen and M.V. Erdmann, G.R. (2012). Reef fishes of the East Indies. Volumes I-III in: Reef fishes of the East Indies. Tropical Reef Research, Perth, Australia. LIRS catalog number 90162.

Other references

  • Jawad, L.A. (2007). Comparative morphology of the otolith of the triplefins (Family Tripterygiidae), Journal of Natural History, 41: 901-924. LIRS catalog number 1170.
  • Lefèvre, C.D. and D.R. Bellwood (2015). Disturbance and recolonisation by small reef fishes: the role of local movement versus recruitment. Marine Ecology Progress Series, 537: 205-215. LIRS catalog number 1964.
  • View all references