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.

Tritonia nilsodhneri - Fan Slug

Range & Status

This very rare species described as new to the North Atlantic as recently as 1963 feeds and lays its egg masses upon the gorgonian Sea Fan Eunicella verrucosa . It has been found off the south and north coasts of Cornwall and the Isles of Scilly. Elsewhere it is found in Dorset, south and north Devon (Lundy), south-west Wales, western Ireland and south to the Iberian Peninsula.


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.