#fin  organ of locomotion and balance in fishes and some other aquatic animals
  supertype:  extremity__appendage__member  an external body part that projects from the body; "it is important to keep the extremities warm"
  part:  ray.spine
  part of:  fish
  subtype:  dorsal_fin  unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance
  subtype:  pectoral_fin  either of a pair of fins situated just behind the head in fishes that help control the direction of movement
  subtype:  pelvic_fin__ventral_fin__ventralfin  either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate
  subtype:  caudal_fin__tail_fin  the tail of fishes and some other aquatic vertebrates
     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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