#sea_urchin__seaurchin  shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
  supertype:  echinoderm  marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies
  member of:  class_Echinoidea
  subtype:  edible_sea_urchin__Echinus_esculentus  a sea urchin that can be eaten
  subtype:  sand_dollar  flattened disklike sea urchins that live on sandy bottoms
  subtype:  heart_urchin__hearturchin  sea urchin having a heart-shaped body in a rigid spiny shell

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