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
A species limited to estuarine habitats and which is only recorded at a few sites. It is
recorded from Neal Point and at Cargreen, both on the Cornish side of the River Tamar. Here it is found on various substrata, from the lower shore to shallow water, including the fronds of fucoid seaweeds. Elsewhere it is known from Orkney, Northern Ireland, Poole Harbour (Dorset) and the River Severn. It may be more widespread but is extensively confused with other brackish water and estuarine species.
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.