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Brief Summary

The blue jellyfish is a flat average-sized jellyfish. The jellyfish can sting severely with its long hairy tentacles located on the rim of the bell. Blue jellyfish are often found close to the shore with easterly winds. During the summer, they can spoil a warm beach day for bathing guests. Beach pavilion owners seem to easily forget previous jellyfish invasions. Every times there's an invasion, you always hear that "it has never been this bad".
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Source: World Register of Marine Species


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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Cyanea lamarckii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 3
Species With Barcodes: 1
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Blue jellyfish

Blue jellyfish!<-- This template has to be "warmed up" before it can be used, for some reason -->

Cyanea lamarckii, also known as the Blue jellyfish or Bluefire jellyfish, is a species of jellyfish in the family Cyaneidae. Populations in the western Pacific around Japan are sometimes distinguished as Cyanea nozakii or Cyanea capillata nozakii.



This species is found in the pelagic zone off the west coast of Scotland, the North Sea and the Irish Sea, sometimes with the more common Lion's Mane Jellyfish, (Cyanea capillata).[1]


Cyanea lamarckii has a blue or yellow tone and grows to approximately 10 to 20 cm, but specimens can grow to 30 cm.[2] In Scandinavian seas this species rarely grows larger than 15 cm.

This jellyfish has many stinging tentacles. The four mouth arms are large with many wrinkles and ripples.[3]


The taxonomy of Cyanea species is not fully agreed upon. Some zoologists have suggested that all species within the genus should be treated as one. However, Cyanea lamarckii exists with two other distinct taxa in at least the eastern North Atlantic.

The species specifyer originates from the French naturalist Lamarck (Latin name form: Lamarckius).

Life cycle

The medusae bud and loosen from the mature polyps between January and March around the British Isles and southern North Sea. This occurs in a similar way to the life cycle of the moon jellyfish.


Further reading

Howson, C.M.; Picton, B.E. (Ed.) (1997). The species directory of the marine fauna and flora of the British Isles and surrounding seas. Ulster Museum Publication, 276. The Ulster Museum: Belfast, UK. ISBN 0-948150-06-8. vi, 508

Muller, Y. (2004). Faune et flore du littoral du Nord, du Pas-de-Calais et de la Belgique: inventaire. [Coastal fauna and flora of the Nord, Pas-de-Calais and Belgium: inventory]. Commission Régionale de Biologie Région Nord Pas-de-Calais: France. 307 pp.

Cornelius, P.F.S. (2001). Cubozoa, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 111

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