Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Acipenseriformes Berg, 1940 - sturgeons
           1 Family Acipenseridae Bonaparte, 1832 - sturgeons
           2 Family Polyodontidae Bonaparte, 1835 - paddlefishes