Jellies belong to the phylum Cnidaria, which has three major classes: Hydrozoa, the primitive fern-like creatures, many of which produce small jellies; Scyphozoa, the large jellies or scyphomedusae and their polyps; and Anthozoa, the sea anemones. Although many of these animals produce a jelly as part of their life cycle, there are only about 200 species of large jellies that people are likely to notice – most of these are in the class Scyphozoa.

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