Cornish Biodiversity Network  -  Supporting Wildlife Recording

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Cornish Red Data (2009)

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.

Atlantopsocus adustus

Range & Status

Only known in Britain from Cornwall. An Atlantic island species native only to the Canary Islands, Madeira and the Azores.

Regional Distribution

Discovered on Elm Ulmus spp. and Alder Alnus glutinosa trees in a coastal valley above Lantivet Bay in 2006 (Alexander, 2007), but found more widely in 2007 on coastal Willow Salix spp., Gorse Ulex spp. and Blackthorn Prunus spinosa scrub along the north coast and at Treluggan Cliff, Veryan Bay.

Habitat & Ecology

A typical barkfly, feeding on epiphytes growing on the exposed bark on trees and shrubs. Probably has precise requirements for temperature and humidity, hence its association with the coast.


Excessive removal of coastal scrub as part of coastal grazing restoration schemes.


All of the known sites are on National Trust property and most lie within 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.