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
Native. Circumpolar Boreal-montane species. Scattered across western Britain.
Known from five sites only, in moorland pools, on Bodmin Moor (SX17), and recorded
from three of these since 1999. Probably still in the other pools.
Habitat & Ecology
In gravel-bottomed acid pools with shallow areas on Bodmin Moor.
Change of use to fishing lakes which can lead to higher levels of nutrients and silting. Drainage of pools is unlikely but cannot be ruled out.
All the sites are SSSI.
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.