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This article is about the aquatic animal-form. For similar animals, see gelatinous zooplankton. For other uses, see Jellyfish (disambiguation). Jellyfish Informal grouping of animals in Medusozoa Pacific sea nettle ( Chrysaora fuscescens ) including Scyphozoa — true jellyfish Cubozoa — box jellyfish Staurozoa — stalked jellyfish some Hydrozoa — small jellyfish Jellyfish or sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are not mobile, being anchored to the seabed by stalks. The bell can pulsate to provide propulsion and highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators. Jellyfish have a complex life cycle; the medusa is normally the sexual phase