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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.

Terellia vectensis

Range & Status

Mainly known from the Wiltshire, Hampshire and Isle of Wight chalk downs.

Regional Distribution

Discovered on the cliffs at Boscastle in 1990 (Alexander, 1993b) and subsequently found at Glebe Cliff, Tintagel.

Habitat & Ecology

Larvae develop in the seed-heads of Saw-wort Serratula tinctoria where it grows in profusion in sea cliff grasslands (Cornwall) or chalk downland (central southern England).


Abandonment of grazing, with consequent sward coarsening and scrub development, but also heavy grazing which reduces flowering and causes trampling of any seed-heads.


Maintenance and restoration of coastal grazing schemes, ensuring not overgrazed.


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.