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.

Hesperibalanus fallax

Range & Status

Recently (1984) described as new to the British marine fauna when it was found attached to the valves of the Queen Scallop Aequipecten opercularis trawled from depths of 45-60m off Plymouth. Since this time it has been recorded off the south Cornish coastline, again on A. opercularis , and also from south Wales, where it was found attached to stipes of Laminaria hyperborea . It has also been recorded on the shells of the Common Whelk Buccinum undatum , on the carapace of the Spider Crab Maja squinado , on the Pink Sea Fan Eunicella verrucosa and on the body of the Lobster Homarus gammarus . British records are currently restricted to south-western coasts from Portland to South Wales.


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.