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
In British waters, this species is found mainly in rock pools in the inter-tidal zone, preferring large, deep pools on relatively exposed shores, with abundant perennial algae such as Cystoseira and Corallina species. It is also known to occur sublittorally to a depth of about 20m. Described as a new species as recently as 1978 from southern Britain, it is now known in several other areas in south-west Britain, the coasts of south-west and northwest Wales, south Devon, west and south-west of Ireland, Strangford Lough and the Isle of Man. Elsewhere it occurs southwards, to the Mediterranean and Adriatic Seas.
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.