Stinging
Cyanea capillata
Scyphozoa (Cyaneidae)
Nicknamed the "lion's mane jellyfish", it is the largest known jellyfish species in the world. It favors the cold waters of the North Sea, the UK, and the US Northeast coast.
Sting symptoms
Painful sting, intense burning sensation, stubborn redness.
Identification
Imposing umbrella often dark red, orange, or yellow, with an impressive mass of hair-like tentacles resembling a mane.
Size
Umbrella: 30 cm to 2 m / Tentacles: up to 30 m
Habitat
Cold, coastal and pelagic waters.
Scientific family
Scyphozoa (Cyaneidae)
Community photos
Photos submitted and verified by Meduseo users. (8)
13/09/2026
13/09/2026
I think it’s a lions mane
20/08/2026
Malahide East
20/08/2026
Malahide East
20/08/2026
Malahide East
20/08/2026
Malahide East Few lions mane washed up and and good few in the water
15/08/2026
15/08/2026
12/08/2026
Wicklow
12/08/2026
Wicklow LIONS MANE JELLYFISH IN WICKLOW HARBOUR
07/08/2026
07/08/2026
29/07/2026
29/07/2026
23/07/2026
Sligo
23/07/2026
Sligo Confirmed by lifeguard and also taken out from the water approx 70cm without tentacles