Thordisa filix is a species of sea slug, a dorid nudibranch, shell-less marine opisthobranch gastropod molluscs in the family Discodorididae.Gofas, S. (2004). Thordisa filix Pruvot-Fol, 1951. In: MolluscaBase (2016). Accessed through: World Register of Marine Species on 2016-05-12.

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