echinoderm

noun1

1. •
   An animal of the phylum Echinodermata, comprising radially symmetric, spiny-skinned marine animals including seastars, sea urchins, sea cucumbers, crinoids, and sand dollars.

   • Comparatively few additions were therefore made to the previously known Echinoderm-fauna of Brazil, only a single species, a Leptasterias, being with certainty new to science. — 1879