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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.
- ‘A traditional hypothesis of the Echinodermata using only extant taxonomic groups places the Asteroidea and Ophiuroidea as sister groups based on the shared derived characteristic of a five-rayed body plan.’
- ‘The superphylum Deuterostomia contains the diverse phyla Chordata and Echinodermata and the minor phyla Hemichordata and Urochordata.’
- ‘Some zoologists would put the Urochordata closer to the Echinodermata, instead of within the Chordata proper.’
- ‘Sea cucumbers, invertebrate animals of the phylum Echinodermata, might hold out some hope for the afflicted.’
- ‘Crinoids are a class of the phylum Echinodermata, which includes living starfishes, sand dollars and sea urchins, as well as approximately six hundred living species of crinoids.’
Modern Latin (plural), from Greek ekhinos hedgehog, sea urchin + derma skin.
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