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Echinoderms are marine animals with pentamerous radial symmetry, an endoskeleton, and tube feet. They include sea stars, sea urchins, sand dollars, sea cucumbers, sea lilies, and feather stars, which are classified into the classes Ophiuroidea, Echinoidea, Holothuroidea, Crinoidea, and Asteroidea. Sea stars have a water vascular system and all echinoderms have tube feet used for locomotion.

















