sea urchin

1. Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells (synset 102321747)
   is a type of: echinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodies
   subtypes:

   • echinus esculentus, edible sea urchin - a sea urchin that can be eaten
   • sand dollar - flattened disklike sea urchins that live on sandy bottoms
   • heart urchin - sea urchin having a heart-shaped body in a rigid spiny shell
   belongs to: class echinoidea, echinoidea - sea urchins and sand dollars

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