Trinchesia perca, common name Lake Merritt cuthona, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk 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, Its placement somewhat controversed, some institutions place it in genus Cuthona under family Cuthonidae.MolluscaBase eds. (2026). MolluscaBase. Cuthona perca (Er. Marcus, 1958). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=141630 on 2026-03-05
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