Hawaiian blackhead triplefin

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Hawaiian blackhead triplefin
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Tripterygiidae
Genus: Enneapterygius
Species: E. atriceps
Binomial name
Enneapterygius atriceps
(Jenkins, 1903)
  • Tripterygium atriceps Jenkins, 1903[1]

The Hawaiian blackhead triplefin (Enneapterygius atriceps), also known as the Hawaiian triplefin in Hawaii,[2] is a species of triplefin blenny in the genus Enneapterygius.[3] It is a tropical blenny found in coral reefs in the Pacific Ocean, from the Hawaiian Islands, French Frigate Shoals, Laysan Island, and Midway Atoll.[3] Blennies in this species swim at a depth range of 1-23 metres, and inhabit dead coral and rock.

It was originally described by O.P. Jenkins in 1903,[4] as a species of Tripterygion, but was reassigned to Enneapterygius by R. Fricke in 1997.[5]


The Hawaiian blackhead triplefin is considered part of the Enneapterygius hemimelas species group. It is considered a small or medium member of the group,[6] with males reaching a maximum length of 2.6 centimetres.[3] Males can be distinguished from females by their dark head colouring.[6]


  1. ^ Synonyms of Enneapterygius atriceps at www.fishbase.org.
  2. ^ Common names for Enneapterygius atriceps at www.fishbase.org.
  3. ^ a b c Hawaiian blackhead triplefin at www.fishbase.org.
  4. ^ Jenkins, O. P., 1903 (23 July) [ref. 2341] Report on collections of fishes made in the Hawaiian Islands, with descriptions of new species. Bulletin of the U. S. Fish Commission v. 22 [1902]: 415-511, Pls. 1-4.
  5. ^ Fricke, R., 1997 Tripterygiid fishes of the western and central Pacific, with descriptions of 15 new species, including an annotated checklist of world Tripterygiidae (Teleostei). Theses Zool. 29:1-607.
  6. ^ a b The Byerley Turk: The Incredible Story of the World's First Thoroughbred By Jeremy James; page 162.

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