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
Only recorded in the UK from Cornwall and Devon. Foster (1987) provides a national
Recorded from College Reservoir in 1989 (Booth, 1990), Red Moor in 1972 (Foster,
1973), the De Lank river on Bodmin Moor in 1998, and Breney Common in 2001 (Bilton, unpublished).
Habitat & Ecology
Recorded from the shallows and margins of ponds and reservoirs, and muddy gravel beds beside rivers. A relatively common species further south in western Europe.
Red Moor and Breney Common are Cornwall Wildlife Trust reserves. Listed (middle list) as a globally threatened/declining species (BSGR, 1995) and on the UK BAP Priority Species list (2007).
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.