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.

Cathormiocerus socius - A ground weevil

Range & Status

Western oceanic, known from the coasts of Cornwall, Devon, Dorset and south


Regional Distribution

Mainly known from the north coast, in the Tintagel area: Bossiney in 1908 (Butler, 1910), and Glebe Cliff in 1981 by S.M. Turk; also St. Merryn (Sharp, 1910) and Godrevy Point and St. Agnes in 2007 by K.N.A. Alexander. Also on The Lizard, most recently at Kennack Sands by Pete Kirby in 1992; and discovered at Nare Head by K.N.A. Alexander in 2004. There is also an old record from St. Mary' s, Isles of Scilly (Blair, 1931).

Habitat & Ecology

Larvae root-feeding, while the adults occur at the base of plants, particularly Buck' s-horn Plantain Plantago coronopus where it grows on rocky sea cliffs. Has also been found in litter under heather.


Loss of semi-natural coastal pastures through abandonment of grazing. Public pressure causing excessive trampling.


Many of the known sites are on National Trust land.


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.