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 widespread species in Europe, but largely found in southern Britain. Very local, probably increasingly scarce through habitat degradation and loss, but also probably underrecorded.
Old reports from the Lizard and West Penwith, but only recently found on Carvear Moor, St. Blaise, in 1991 and Colvannick Pond, Bodmin Moor in 2004. Probably many more sites await discovery.
Habitat & Ecology
A wetland species, occurring amongst dense wet vegetation in shallow water or at water margins, amongst Sphagnum spp. in bogs and at the margins of acid pools, in fens, ditches, and seepages on soft rock cliffs.
Drainage and infilling of wetlands.
Protection of old wetlands is required.
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.