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
Status: Insufficiently known. Can not be distinguished unless mature males are present. Recorded from only two 10km squares in Cornwall and from one Scottish site, it has been collected from woodland, waste ground and maritime habitats. Regarded as a central European species, it occurs in France at least as far as Normandy so the Cornish populations may be regarded as a natural extension of its range (Kime, 2001 quoted in Lee, 2006). It can be distinguished from the much more widespread C. proximum only when mature males are available (generally winter-spring).
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.