Polyipnus tridentifer

{{Short description|Species of fish}}

{{Speciesbox

| image = Polyipnus tridentifer.jpg

| genus = Polyipnus

| species = tridentifer

| authority = McCulloch, 1914 {{cite WoRMS |author=Bailly, Nicolas |year=2015 |title=Polyipnus tridentifer McCulloch, 1914 |id=275501 |accessdate=28 February 2016|db=}}

}}

Polyipnus tridentifer, commonly known as the three-spined hatchetfish, is a species of ray-finned fish in the family Sternoptychidae. It occurs in deep water in the Indo-Pacific Ocean, at depths between about {{convert|640|and|825|m|-2}}.{{cite web |url=http://www.fishbase.se/summary/Polyipnus-tridentifer.html |title=Polyipnus tridentifer McCulloch, 1914 |publisher=FishBase |accessdate=28 February 2016}}