Definition of Echinodermata in English:


proper noun

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

    • ‘The superphylum Deuterostomia contains the diverse phyla Chordata and Echinodermata and the minor phyla Hemichordata and Urochordata.’
    • ‘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.’
    • ‘Sea cucumbers, invertebrate animals of the phylum Echinodermata, might hold out some hope for the afflicted.’
    • ‘Some zoologists would put the Urochordata closer to the Echinodermata, instead of within the Chordata proper.’
    • ‘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.’


Modern Latin (plural), from Greek ekhinos hedgehog, sea urchin + derma skin.