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.

Piesma quadratum spergulariae - A piesmatid bug

Range & Status

The world distribution of this subspecies is in the Isles of Scilly.

Regional Distribution

Recently reported from St. Mary' s and St. Martin' s, with older records from St. Agnes,

Bryher and Samson.

Habitat & Ecology

Seems to be confined to places where the foodplant Rocky Sea-spurrey Spergularia

rupicola grows in mats overhanging cliffs at the very edge of the sea.


No major threats, but locally host plant stands may be subject to damage by trampling visitors.


No particular conservation measures are needed, although it may be desirable locally to restrict visitor access where trampling and erosion are seriously affecting the vegetation.


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.