We show distribution of the sea slug Dendrodoris limbata (Cuvier, 1804) (Mollusca, Gastropoda, Nudibranchia) along metropolitan French coasts. 82 records between 2010 and 2017 were extracted from the citizen science database BioObs. This species native to Mediterranean shows a discontinuous distribution, on one hand along Mediterranean coast from Var to Pyrénées-Orientales, mainly in Lagune de Thau; on the other hand in the Golfe Normand-Breton of the English Channel where it is introduced. We discuss the potential role of oyster transfer between shellfish ponds as a vector of this discontinuous distribution.
Introduced species, native species, France, Nudibranchia, cartography.