#echinoderm  marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies
  supertype:  invertebrate  any animal lacking a backbone or notochord; the term is not used as a scientific classification
  subtype:  starfish  brittle_star  basket_star  sea_urchin  crinoid  sea_cucumber
  member of:  phylum_Echinodermata
  part:  water_vascular_system  system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration
  part:  ambulacrum  one of the five areas on the under surface of an echinoderm on which the tube feet are located
  part:  tube_foot  tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration

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