Trinchesia pupillae is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.MolluscaBase eds. (2026). MolluscaBase. Tenellia pupillae (Baba, 1961). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1793363 on 2026-03-02Korshunova 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 shallow water at Tannowa and Kada, Osaka Bay, Pacific Ocean coast, Japan. The original description also lists additional localities of Mukaishima, Inland Sea of Seto; Nou and Awashima, Niigata Prefecture; Toyama Bay and Tsuruga Bay, Sea of Japan coast. The species is also reported from Oyster Bay, Dar es Salaam, Tanzania.Edmunds, M. 1970. Opisthobranchiate Mollusca from Tanzania. II. Eolidacea (Cuthonidae, Piseinotecidae and Facelinidae). Proceedings of the Malacological Society of London 39:15-57.
Description The adult size of Trinchesia pupillae is only 3–5 mm. It has swollen cerata and extensive white surface pigmentation on the body and cerata, with an orange ring on the rhinophores and oral tentacles.Cuthona pupillae at Umiushi.info
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