Trinchesia foliata is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Trinchesiidae.Gofas, S. (2014). Cuthona foliata (Forbes & Goodsir, 1839). Accessed through: World Register of Marine Species on 2015-02-01Korshunova 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 Orkney, Scotland. It has been reported from the NE Atlantic, from the Faeroes and Norway south to Portugal, and in the Mediterranean Sea.Picton, B.E. & Morrow, C.C. (2010). Trinchesia foliata (Forbes & Goodsir, 1839)[In] Encyclopedia of Marine Life of Britain and Ireland
Description The typical adult size of this species is 8–11 mm.Thompson, T.E. and Brown, G.H. (1984). Biology of Opisthobranch Molluscs, Volume II. The Ray Society. 229 pages 41 plates, 40 figures
Habitat Trinchesia foliata feeds on hydroids. It has been reported from a number of hydroids including Dynamena pumila, Sertularella gayi, Sertularella polyzonias and Abietinaria abietina family Sertulariidae.McDonald, G. R., & Nybakken, J. W. (1997). A worldwide review of the food of nudibranch mollusks. I. Introduction and the suborder Arminacea. Veliger 40(2):157-159. (supplement, p. 1- 426)
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