Halfblack triplefin

{{Short description|Species of fish}}

{{Speciesbox

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Williams, J. |author2=Holleman, W. |date=2014 |title=Enneapterygius hemimelas |volume=2014 |page=e.T179112A1571265 |doi=10.2305/IUCN.UK.2014-3.RLTS.T179112A1571265.en |access-date=19 November 2021}}| taxon = Enneapterygius hemimelas

| authority = (Kner & Steindachner, 1867)

| synonyms = * Tripterygium hemimelas Kner & Steindachner, 1867

• Tripterygion hemimelas (Kner & Steindachner, 1867)
• Enneapterygius fuligicauda Fowler, 1946
• Tripterygion fuligicauda (Fowler, 1946)
• Enneapterygius macrobrachium Fowler, 1946
• Tripterygion macrobrachium (Fowler, 1946)

| synonyms_ref = {{FishBase|Enneapterygius|hemimelas|month=April|year=2019}}

}}

The halfblack triplefin (Enneapterygius hemimelas), also known as the half-black triplefin, blackbelly triplefin, or the green-tail threefin, is a species of triplefin blenny in the genus Enneapterygius. It was originally described by R. Kner and F. Steindachner in 1867.{{cite journal | author1 =Kner, R. | author2 = F. Steindachner | name-list-style = amp | year = 1867 | title = Neue Fische aus dem Museum der Herren Joh. C. Godeffroy & Sohn in Hamburg | journal = Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe | volume = 54 | issue = pt 3 | pages = 356–395}} It is a non-migratory tropical blenny known from coral reefs in the western Pacific Ocean, and has been described from the Ryukyu Islands to eastern Australia. It has been recorded swimming at a depth range of 0–30 metres (0-98.4 feet).[http://www.fishwise.co.za/Default.aspx?TabID=110&GenusSpecies=Enneapterygius_hemimelas&SpecieConfigId=222058 Enneapterygius hemimelas] at www.fishwise.co.za.

The halfblack triplefin is described as a "relatively large" member of the Enneapterygius hemimelas species group.Fricke, R., 1994 [ref. 21827] Tripterygiid fishes of Australia, New Zealand and the southwest Pacific Ocean (Teleostei). Theses Zoologicae v. 24: i-ix + 1-585.