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
Very localised across Britain and has become increasingly scarce in recent years.
Recorded in west Cornwall from Marazion Marsh in 1981.
Habitat & Ecology
Associated with Pondweeds Potamogeton spp. and Water-milfoils Myriophyllum spp.; the larvae are aquatic and the adults rarely emerge from the water.
Silting or artificial in-filling of ponds; pollution.
Protect ponds and their catchments from damaging activities.
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.