Ruanoho decemdigitatus

{{Short description|Species of fish}}

{{Use New Zealand English|date=July 2024}}

{{Speciesbox

| image = Ruanoho decemdigitatus 115078149.jpg

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Clements, K.D. |date=2014 |title=Ruanoho decemdigitatus |volume=2014 |page=e.T178998A1557404 |doi=10.2305/IUCN.UK.2014-3.RLTS.T178998A1557404.en |access-date=20 November 2021}}

| taxon = Ruanoho decemdigitatus

|authority = (F. E. Clarke, 1879)

|synonyms = Trypterigium decemdigitatus F.E. Clarke, 1879

}}

Ruanoho decemgitatus, the longfinned triplefin, is a species of fish in the family Tripterygiidae. It is endemic to New Zealand.{{FishBase |genus=Ruanoho ||species=decemdigitatus |month=August |year=2022}} It is marine fish that occurs in shallow water (maximum depth 10 m) on rocks and cobbles on silty reefs in semi-sheltered areas. It can grow to {{convert|12|cm|abbr=on}} total length.