#aquatic_vertebrate__aquaticvertebrate  animal living wholly or chiefly in or on water
  supertype:  #vertebrate__craniate  animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
  subtype:  #jawless_vertebrate  #placoderm  #fish
  part:  #flipper  the flat broad limb of aquatic animals specialized for swimming

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