#crossopterygian__lobefin__lobe-finned_fish  any fish of the order Crossopterygii; most known only in fossil form
  supertype:  bony_fish  any fish of the class Osteichthyes
  member of:  subclass_Crossopterygii
  subtype:  coelacanth__Latimeria_chalumnae  fish thought to have been extinct since the Cretaceous Period but found in 1938 off the coast of Africa

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