Exclusively marine invertebrates with a distinctive five-part radial body symmetry as adults, a calcium-carbonate endoskeleton just beneath the skin, and a unique water-vascular system of fluid-filled canals used for movement and feeding. Echinodermata includes sea stars, sea urchins, brittle stars, sea cucumbers and feather stars.
Facts
Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Connections
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