The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
This beautiful species feeds upon the ectoproct polyzoans Flustra foliacea and Chartella papyracea . Until 1972 it was regarded as one of the rarest British nudibranchs but since then it has been encountered more frequently in some years. It has been found in up to 30m off the coasts of Cornwall and Devon and east to Sussex. Elsewhere it is recorded from south-west and north-west Wales, south-west Ireland, north-west Scotland and as far south as the Mediterranean Sea and the coast of Morocco.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.