A stalked jellyfish (Calvadosia campanulata)


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Researched byDr Harvey Tyler-Walters & Jessica Heard Refereed byAdmin
AuthorityLamouroux, 1815
Other common names- SynonymsLucernariopsis campanulata (Lamouroux, 1815)



Calvadosia campanulata has a funnel-shaped bell, which may grow to 4.5 cm in height. The colour is always uniform but varies between red, green or brown. The umbrella surface has a wart like appearance with groups of turquoise spots (nematocyst storage vesicles). Each of the eight arms has approximately 45 tentacles, the outer ones displaying significant basal swelling. Long, narrow gonads extend to the tip of each arm.

Recorded distribution in Britain and Ireland

Calvadosia campanulata is recorded from the coasts of the Sheltand Isles, Orkney, south-west England, Isles of Scilly, south-west Ireland, Pembrokeshire, the Isle of Man, Northern Ireland, the west coast of Scotland and the Outer Hebrides, although most records occur in south-west England and the west of Scotland.

Global distribution

Calvadosia campanulata is only recorded from the British Isles.


Calvadosia campunulata inhabits the lower shore and shallow sublittoral of rocky coasts, commonly found on macroalgae and seagrasses.

Depth range

Lowwer eulittoral to shallow sublittoral

Identifying features

  • Eight arms.
  • Uniformly coloured with groups of turquoise spots.
  • Eight long narrow gonads.
  • No anchor (primary tentacle) between each arm (see additional information).

Additional information

Anchors (primary tentacles) are present in certain species of Strauromedusae (e.g. Haliclystus salpinx) between the arms. These are used by the animal to attach to the substratum and allow it to move in a cartwheeling fashion.

Miranda et al. (2010, 2016a&b) provide detailed studies of the morphology, histology and taxonomy of the Stauormedusae. Information on the ecology of Calvadoisa campanulata is limited. Information from similar species or other members of the group (Stauromedusae) was used to complete this review. Evidence relevant to sensitivity assessment was particularly lacking. Sensitivity assessments are based on proxies (e.g. the sensitivity of its preferred substratum) and expert judgement where possible. The sensitivity assessments may also vary with habitat, i.e. between macroalgal dominated hard rock and seagrass beds and the explanatory text for each assessment must be consulted.

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Further information sources

Stauromedusae UK

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  1. Corbin, P.G., 1979. The seasonal abundance of four species of Stauromedusae (Coelenterata: Schyphomedusae) in Plymouth. Journal of the Marine Biological Association of the United Kingdom, 59, 385-391.


This review can be cited as:

Tyler-Walters, H. & Heard, J.R. 2017. Calvadosia campanulata A stalked jellyfish. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. Available from: http://www.marlin.ac.uk/species/detail/2101

Last Updated: 22/02/2017