Trinchesia millenae is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.Bouchet, P. (2014). Cuthona millenae Hermosillo & Valdés, 2007. Accessed through: World Register of Marine Species on 2015-02-03Korshunova 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 Islas Revillagigedo, Colima, Mexico in the tropical eastern Pacific region.Rudman, W.B., 2006 (May 8). Cuthona millenae Hermosillo & Valdés, 2007. [In] Sea Slug Forum. Australian Museum, Sydney.
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