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Jellyfish are members of Phylum Cnidaria, Class Scyphozoa or true jellyfish. They are "cup-shaped" animals. Scyphozoans are organisms with tentacles that can sting their prey. They can be found in oceans all over the world. Jellyfish have special nematocysts, or stinging cells located along their tentacles, which act like harpoons and can sting prey,...

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Jellyfish are members of Phylum Cnidaria, Class Scyphozoa or true jellyfish. They are "cup-shaped" animals. Scyphozoans are organisms with tentacles that can sting their prey. They can be found in oceans all over the world. Jellyfish have special nematocysts, or stinging cells located along their tentacles, which act like harpoons and can sting prey, injecting a venom in prey or humans. Cubozoa, or box jellies can be particularly dangerous. Hundreds of people have been killed by jellyfish stings in the past century. Some large jellyfish are considered to be a delicacy and are consumed in parts of Asia and are commercially fished.

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