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.

Calvadosia cruxmelitensis - St. John's Stalked Jellyfish

Range & Status

This species of stalked jellyfish is most commonly found on the red seaweeds Chondrus crispus and Mastocarpus stellatus , and occasionally on Eelgrass Zostera spp. on the lower shore and in the shallow sublittoral. A south-western species occurring from Dorset through to north Devon, it is also known from the west coast of Ireland. Lucernariopsis cruxmelitensis is on the UK List of Priority Species.

Click here to see Aphotoflora images by David Fenwick


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.

Cornish Biodiversity Network. 2017.