Trinchesia yamasui is a species of sea slug, an aeolid nudibranch, a shell-less marine gastropod mollusk in the family Trinchesiidae.MolluscaBase eds. (2026). MolluscaBase. Tenellia yamasui (Hamatani, 1993). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1783799 on 2026-03-02Korshunova 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 Okinawa, Japan.Hamatani, I (1993) A new cuthonid species (Nudibranchia, Aeolidacea), Cuthona yamasui n.sp., from Okinawa, Southwestern Japan. Venus, The Japanese Journal of Malacology, 52(2): 127-133. (Figs 1-3) It has been reported from many places in the Indo-West Pacific region but some of these records are now known to be members of a species complex.Cella K., Carmona L., Ekimova I., Chichvarkhin A., Schepetov D., Gosliner T.M., (2016) A Radical Solution: The Phylogeny of the Nudibranch Family Fionidae. PLoS ONE, 11(12): e0167800. doi:10.1371/journal.pone.0167800
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