Trinchesia longi 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 Isla Raza, Baja California, Mexico, .
Description The adult size of this species is up to 32 mm in length. The cerata are cored with green digestive gland and have surface rings of pale blue, yellow-gold and red pigment and white tips.Behrens, (2000). Cuthona longi at the Slug Site.
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