{{Short description|Species of gastropod}} {{Speciesbox | image = | image_caption = | taxon = Trinchesia longi | authority = (Behrens, 1985)<ref name=orig>Behrens, D. W. (1985). [https://www.biodiversitylibrary.org/item/134487#page/442/mode/1up A new species of ''Cuthona'' from the Gulf of California.] Veliger 27(4):418-422.</ref> |synonyms= {{Species list |Cuthona longi|Behrens, 1985 }} }}

'''''Trinchesia longi''''' is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.<ref name="Korshunova">Korshunova T.; Fletcher K.; Martynov A. (2025). [https://doi.org/10.1093/zoolinnean/zlaf057 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, </ref>

==Distribution== This species was described from Isla Raza, Baja California, Mexico, {{coord|28|48|00|N|113|00|00|W}}.<ref name=orig/>

== Description == The adult size of this species is up to 32&nbsp;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.<ref>Behrens, (2000). [http://slugsite.us/bow/nudwk250.htm ''Cuthona longi''] at the Slug Site.</ref>

== References == {{reflist}}

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Category:Trinchesiidae Category:Gastropods described in 1985 Category:Taxa named by David W. Behrens