Trinchesia fidenciae 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 Playa del barranco de Avalos, Isla de La Gomera, the Canary Islands. It has been reported from Caloura, Sao Miguel Island, Azores and Montana Roja, Tenerife.Ortea J.A., Caballer, M. & Moro, L. (2001). Primeros datos sobre un complejo de especies alrededor de Cuthona willani Cervera, García & López, 1992 (Mollusca: Nudibranchia) en la Macaronesia y Marruecos. Revista de la Academia Canaria de Ciencias XIII (4): 101-112.
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