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.

Heterogenea asella - The Triangle

Range & Status

Widespread across Europe to Russia, but known in Britain mainly from large ancient oak woods in Hampshire, Wiltshire, Sussex and Kent (Waring & Townsend, 2003). Recently found in North Devon (McCormick, 2001) and so could occur in woods in north Cornwall.

Regional Distribution

Single specimens recently recorded from Cornwall only from one site at Herodsfoot

(Smith, 1961) and again in 1969 (Smith, 1997). This small, inconspicuous species may still be present here but overlooked, although moth trapping in this area has failed to produce more records.

Habitat & Ecology

The adult inhabits woodland where the larvae feed on Oak Quercus spp. and Beech

Fagus sylvatica .


Felling of woodland habitat.




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.

Cornish Biodiversity Network. 2017.