{{Short description|Species of gastropod}} {{Speciesbox | image = | image_caption = | taxon = Catriona alpha | authority = Baba & Hamatani, 1963<ref>Baba K. & Hamatani I. (1963). [http://hdl.handle.net/2433/175339 A cuthonid, ''Cuthona alpha'' n. sp., with a radula of ''Catriona'' type (Nudibranchia Eolidoidea).] Publications of the Seto Marine Biological Laboratory, 11(2): 339-343. <nowiki>[31 December 1963]</nowiki></ref> | synonyms = * ''Cuthona alpha'' <small>Baba & Hamatani, 1963</small> (original combination) * ''Trinchesia alpha'' <small>Baba & Hamatani, 1963</small> }}

'''''Catriona alpha''''' is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.<ref name="WoRMS">Rosenberg, G. (2014). Trinchesia alpha (Baba & Hamatani, 1963). Accessed through: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1636800 on 2026-03-02</ref>

==Distribution== This species was described from the shore of Kozuchi-jima near the Tamano Marine Laboratory, Tamano, Inland Sea of Seto, Japan; it also occurs off New Zealand.

== Description == The typical adult size of this species is 13–15&nbsp;mm.<ref>[http://www.geocities.co.jp/NatureLand/3709/054401M.htm Photograph of ''Trinchesia alpha'' - Uozu, Toyama Bay.]</ref>

== References == {{Reflist}} * 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== * [http://hdl.handle.net/2433/175339 Baba, K.; Hamatani, I. (1963). ''A cuthonid, Cuthona alpha n. sp., with a radula of Catriona type (Nudibranchia Eolidoidea).'' Publications of the Seto Marine Biological Laboratory. 11(2): 339-343] * [http://www.molluscs.otago.ac.nz 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]

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Category:Trinchesiidae Category:Gastropods described in 1963 Category:Taxa named by Kikutaro Baba