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nounmarine invertebrates with tube feet and five-part radially symmetrical bodiestype of:
Definition that contains echinoderm
- starfish echinoderms characterized by five arms extending from a central disk
- sea cucumber echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders
- sea star echinoderms characterized by five arms extending from a central disk
- holothurian echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders