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
Usually found on Eelgrass Zostera marina at low water to 200m around the Atlantic
Islands and in the Mediterranean, northwards to southern Britain and Ireland. Probably decreasing nationally. In Britain, there have been living examples only from SA15, SA16, SA18/VC1/VC2 and SA19/IOS (shells have been found in SA20/VC1).
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.