Trinchesia futairo is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.Korshunova T.; Fletcher K.; Martynov A. (2025). The endless forms are the most differentiated—how taxonomic pseudo-optimization masked natural diversity and evolution: the nudibranch case Zoological Journal of the Linnean Society, Volume 204, Issue 4, August 2025, zlaf057,
Distribution This species was described from Mukaishima, Inland Sea of Seto, Japan. Also reported from Mutsu Bay, Sagami Bay; Sugashima near Toba, Osaka Bay, Saeki Bay, Amakusa and Toyama Bay in the original description.
Description The typical adult size of this species is 10 mm. The body is pale orange-yellow with the tips of the oral tentacles and rhinophores deeper orange-yellow. The oral tentacles have a longitudinal opaque white band on the posterior side. The cerata have an opaque white mark below the tip on the outer surface.Takaoka Biological Club, (2004). Trinchesia futairo, Sea Slug from the Japan Sea coasts of Middle Japan.
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