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
Status: Insufficiently known. Widespread but most British records are south-western in distribution. Although recorded from the northern coasts of Ireland, Mull, Eigg, Norfolk, Kent and North Wales this is predominantly a SW species (Lee, P. 2006) and there are numerous records from South Wales, Devon and Cornwall. It seems to be common in the Channel Islands and is found throughout Western Europe as far north as Belgium. Said to be recognisable by a longitudinal whitish stripe along the darker body, this feature is certainly not always obvious, especially in live specimens.
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.