#caudal_fin__tail_fin  the tail of fishes and some other aquatic vertebrates
  supertype:  #fin  organ of locomotion and balance in fishes and some other aquatic animals
  part of:  #fish
  subtype:  #heterocercal_fin  tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks
  subtype:  #homocercal_fin  symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes

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