- echinoderm - marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies
--1 is a kind of invertebrate
--1 is a member of Echinodermata, phylum Echinodermata
--1 has part: water vascular system; ambulacrum; tube foot
--1 has particulars:starfish, sea star; brittle star, brittle-star, serpent star; basket star, basket fish; sea urchin; crinoid; sea cucumber, holothurian