Marionia blainvillea is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Tritoniidae.MolluscaBase eds. (2020). MolluscaBase. Marionia blainvillea (Risso, 1818). Accessed on 2021-01-15
Distribution This species was described from the Mediterranean Sea. It is reported from the Atlantic Ocean as far north as the Bay of Biscay.Rudman, W.B., 2001 (October 1) Marionia blainvillea (Risso, 1818). [In] Sea Slug Forum. Australian Museum, Sydney.Ballesteros, Manuel, Enric Madrenas, Miquel Pontes (2021) Marionia blainvillea in OPK-Opistobranquis. Published: 16/05/2012. Accessed: 15/01/2021.
Juveniles of the species are white, as shown below.
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