Stalked jellyfish in a rockpool

Stalked jellyfish in a rockpool

Observation - Stalked jellyfish in a rockpool - Global. Description: Strange umbrella shaped red invertebrate with eight tentacles attached by a stalk to a seaweed frond in a rockpoool on a very low tide. Around 1.5 cms across the tentacles and similar length of stalk. After much research, I am sure my first guess that it

Strange umbrella shaped red invertebrate with eight tentacles attached by a stalk to a seaweed frond in a rockpoool on a very low tide. Around 1.5 cms across the tentacles and similar length of stalk. After much research, I am sure my first guess that it was some form of jellyfish was right - it's one of ten little known species of Stalked jellyfish (Stauromedusae) in UK water and thanks to a great site run by David Fenwick, I think this is Lucernariopsis campanulata see http://www.stauromedusae.co.uk/species_account_lucernariopsis_campanulata.html. The lack of sucker-like primary tentacles (anchors) on the membrane between arms rules out Haliclystus species, and the arrangement of nematocysts and the papillate (covered in pimply protuberances) on the aboral (outer surfaces of stalk and tentacles) surfaces seem just right for L.campanulata. The four most common stalked jellyfish species in the UK are described here: http://www.stauromedusae.co.uk/images/anatomy/guide_most%20common.jpg