#exoskeleton  the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs
  supertype:  #skeletal_system  #body_covering
  subtype:  #carapace__shell__cuticle  hard outer covering or case of certain organisms such as arthropods and turtles
     subtype:  #cuticula  the outer body wall of an insect

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