#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

No statement uses or specializes #fin; click here to add one.