Catriona casha is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Trinchesiidae.MolluscaBase eds. (2026). MolluscaBase. Tenellia casha (Gosliner & R. J. Griffiths, 1981). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1765135 on 2026-03-03Korshunova 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 Cape Town docks, on the Atlantic Ocean coast of South Africa.
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