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 species is found in hollows and crevices in the intertidal zone and in the sublittoral to about 30m depth, on stony ground and burrowing in lithamnion gravel (maerl). Once common in western Ireland, from Cork to Donegal, now depleted by commercial harvesting. Occasional in the Channel Islands, rare in south-west Scotland and very rare in Devon, Cornwall and the Isles of Scilly where there are several old records. It may persist in the extreme south-east of Cornwall where the substratum consists of limestone.
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.