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
Formerly widespread in southern England with a scattered distribution further north, but has become increasingly scarce.
First reported in Cornwall from Mount' s Bay (Clark, 1906). Re-discovered in this area on Willow Salix spp. at Marazion in 1973 by R.T. Bannister, with unconfirmed records from Rosemullion Head and Penpoll in 1974.
Habitat & Ecology
The larvae are inquilines in the galls of Pontania sawflies on Willow foliage.
Clearance of Willow scrub as part of wetland ' restoration' work.
Marazion Marsh is now managed as a nature reserve. This species is listed 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.