#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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