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
Widespread to northern Scotland but very local with about 35 known sites since 1980. Now amended from RDB3 to Notable.
Recorded since 1980 from two localities on The Lizard (1981) and also near Porthscatho (1989).
Habitat & Ecology
Found in marshes and fens with seepages and streams. Adults can be seen at flowers between May and August; the larvae live in organically rich mud.
Drainage and lowering of the water table by extraction.
The Lizard sites are on a National Nature Reserve; the east Cornwall site is on National Trust land managed for invertebrate conservation.
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.