#invertebrate_foot__foot  any of various organs of locomotion or attachment in invertebrates
  supertype:  organ  a fully differentiated structural and functional unit in an animal that is specialized for some particular function
  subtype:  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
  part of:  invertebrate  any animal lacking a backbone or notochord; the term is not used as a scientific classification

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