Fiocuthona concinna is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Cuthonellidae.Bouchet, P. (2025). Fiocuthona concinna. In: MolluscaBase (2026). Accessed through: World Register of Marine Species on 2026-03-06.
Distribution This species was described from Whitley Bay, Northumberland, England. It has been reported from the Northeast Atlantic from Finmarken, Norway south to Normandy, France and in the NW Atlantic from New England as well as from the NE Pacific at Vancouver Island, Canada. In Britain and Ireland it is a northern species, occurring at Skomer Island, Pembrokeshire and in the Irish Sea and Scotland. It is also reported from Iceland.Picton, B.E. & Morrow, C.C. (2010). Cuthona concinna. [In] Encyclopedia of Marine Life of Britain and Ireland.]Rudman, W.B. (2006 May 8) Cuthona concinna (Alder & Hancock, 1843). [In] Sea Slug Forum. Australian Museum, Sydney.
Description The typical adult size of this species is 10–12 mm.Thompson, T.E. and Brown, G.H. (1984). Biology of Opisthobranch Molluscs, Volume II. The Ray Society. 229 pages 41 plates, 40 figures, page 121.
Habitat Fiocuthona concinna feeds on the hydroid Sertularia argentea, family Sertulariidae.
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