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A flower hat jelly (Olindias formosa) photographed at the Osaka Aquarium Kaiyukan
A moon jelly shown in false color at the Pairi Daiza

Jellyfish or jellies<ref name="auto">Van Patten, Peg. "Sting". (2004). Wrack Lines. Paper 11.</ref> are the major non-polyp form of individuals of the phylum Cnidaria. They are typified as free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate for locomotion, while stinging tentacles can be used to capture prey.

Jellyfish are found in every ocean, from the surface to the deep sea. Scyphozoans are exclusively marine, but some hydrozoans live in freshwater. Large, often colorful, jellyfish are common in coastal zones worldwide. Jellyfish have roamed the seas for at least 500 million years,<ref>Fossil Record Reveals Elusive Jellyfish More Than 500 Million Years Old. ScienceDaily (2 November 2007).</ref> and possibly 700 million years or more, making them the oldest multi-organ animal.<ref name=angier2dec>{{#invoke:citation/CS1|citation |CitationClass=news }}</ref>

Jellyfish sections
Intro   Terminology    Anatomy    Taxonomy    Life history and behavior    Ecology    Relation to humans    Use of jellyfish to make eco-friendly products    Haeckel's medusae    See also    References    External links   

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