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.

Thymosia guernei

Range & Status

Found on fissured, vertical rock faces under overhangs or inside caves where the water currents are strong and which may be semi-exposed to wave action. A sublittoral species extending down to about 30m, which seems to be genuinely rare. Recently recorded from southern Britain (Cornwall to Dorset), north Devon (Lundy), south-west and north-west Wales with outlying records for the Outer Hebrides and north-west Ireland. Elsewhere known southwards to the Portuguese coast; possibly a southern (Lusitanian) species.


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.