Rhizostoma pulmo, commonly known as the barrel jellyfish, the dustbin-lid jellyfish or the frilly-mouthed jellyfish, is a scyphomedusa in the family Rhizostomatidae. It is found in the northeast Atlantic, and in the Adriatic, Mediterranean Sea, Black Sea and Sea of Azov. It is also known from the southern Atlantic off the western South African coast and into False Bay.
It is common in the Irish Sea. It typically is up to 40 cm (16 in) in diameter, but can exceptionally reach 90 cm (35 in), making it the largest jellyfish in British waters (Cyanea capillata reaches an even larger size, but is generally smaller in Britain).
- Aquarium of Genoa – species description: Rhizostoma pulmo. Retrieved 31 May 2013.
- "Dustbin-lid jellyfish - Rhizostoma pulmo". MarLIN. Retrieved 16 September 2011.
- Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. 2010. Two Oceans: a guide to the marine life of southern Africa ISBN 978-1-77007-772-0
- "COAST : Community of Arran Seabed Trust - Barrel Jellyfish". www.arrancoast.com. Retrieved 29 May 2018.
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