Trinchesia pinnifera 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 Sagami Bay, Japan. It was subsequently reported from Kii Peninsula, Osaka Bay, Toyama Bay and Tsuruga Bay.Baba, K. (1961). Three new species of the genus Catriona from Japan (Nudibranchia - Eolidacea). Publications of the Seto Marine Biological Laboratory 9(2):367-372, pls. 14-15.
Description This Trinchesia is a white animal with a single, broken, band of orange-yellow below the tip of the cerata.Cuthona pinnifera Baba, 1961 at umiushi-zukan.com
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