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Lion's Mane Jellyfish (Cyanea capillata) – the largest known species of jellyfish. The largest recorded specimen found, washed up on the shore of Massachusetts Bay in 1870, had a bell (body) with a diameter of 7 feet 6 inches (2.29 m) and tentacles 120 feet (37 m) long.
Related to the jellyfish and corals, the beautiful and alien Siphonophore is actually a continuous chain of specialized polyps - individual animals that grow from one another in an organized colony. Some in the colony are devoted to feeding, armed with stinging cells to snag fish or invertebrates. Others are devoted to locomotion, propelling the whole group with a continuous pumping motion. Still others, of course, exist only to reproduce.