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Echinodermata British & World English

A phylum of marine invertebrates which includes starfishes, sea urchins, brittlestars, crinoids, and sea cucumbers. They have fivefold radial symmetry, a calcareous skeleton, and tube feet operated by fluid pressure

Echinodermata in echinoderm British & World English

A marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber