Jellyfish and 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 anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators.
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invertebrate animal organism coral reef underwater jellyfish blue fish organ seafood crystalline dancing sea jellies informal common names medusa-phase gelatinous members subphylum medusozoa major phylum cnidaria free-swimming marine animals umbrella-shaped bells trailing tentacles anchored seabed stalks mobile bell pulsate provide propulsion highly efficient locomotion armed stinging cells may used capture prey defend predators
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