Trinchesia beta is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.Bouchet, P. (2025). Tenellia beta (Baba & Abe, 1964). In: MolluscaBase eds. (2026). MolluscaBase. Tenellia beta (Baba & Abe, 1964). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1793317 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 the vicinity of the Noto marine laboratory, Ogi, Toyama Bay with additional specimens from Kannonzaki and Tsukumo Bay, Hosu-gun, Noto-cho, Noto Peninsula, Ishikawa Prefecture, Japan. It is also reported from Kurasaki Beach, Amami Ōshima.
Description The typical adult size of this species is 4–10 mm.Photograph of Cuthona beta - Kurasaki Beach, Amami Ōshima.
References
Baba, K.; Abe, T. (1964). A catrionid, Catriona beta n. sp., with a radula of Cuthona type (Nudibranchia Eolidoidea). Annual Report of the Noto Marine Laboratory. 4:9-14, pl. 1 Miller, M. C. (2004). An appraisal of the identity of the New Zealand species of the aeolid nudibranch family Tergipedidae (Gastropoda: Opisthobranchia). Journal of Natural History 38: 1183-1192 Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. pp 196–219. in: Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.
External links
Spencer H.G., Willan R.C., Marshall B.A. & Murray T.J. (2011). Checklist of the Recent Mollusca Recorded from the New Zealand Exclusive Economic Zone