#class_Echinoidea__Echinoidea  sea urchins and sand dollars
  supertype:  #class__clas  (biology) a taxonomic group containing one or more orders
  member:  #sea_urchin  #order_Exocycloida  #order_Spatangoida
  member of:  #phylum_Echinodermata__Echinodermata  radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers
     member of:  #kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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