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Clytia islandicum
Kramp, 1919
David Fenwick Snr Have just realised the significance of another image I have of the one posted below from Battery Rocks. It shows the interior of the bell towards the left of the image.Keith Hiscock I showed your pic of the beast to David Conway who does much plankton sampling and usually 'knows'. This time he was stumped. So, anyone else got an identification?
Rachel Shucksmith my only other suggestion would be Clytia islandicum depending on whether you can see on your pictures whether they are marginal vesicles or ocelli.
David Fenwick Snr Marie Hawkins at Plymouth University has just identified this as Clytia hemisphaerica.
David Fenwick Snr She used info from North-West European Thecate Hydriods and their Medusa Pt 2. Paul F.S. Cornelius
Message posted on NE Atlantic Cnidaria on 28 May 2013