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 has a restricted north-western European distribution, mainly in the British Isles and coasts of Scandinavia north to SW. Norway. It has declined in Britain, where it is now rare in southern England with only four relict populations (in Sussex, Buckinghamshire, N. Devon and E. Cornwall). The Cornish site (SX19A, in St. Peter' s Wood) was only discovered in 2000. In England, S. lamellata is a useful indicator of ancient woodland that has never been clear felled. St. Peter' s Wood supports several other woodland snails which are generally rare in Cornwall (Holyoak, 2000b). The woodland is owned and managed by The National Trust so that the site is not regarded as threatened.
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.