Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Pisces Class Actinopterygii Woodward, 1891 - ray-finned fishes Order Acipenseriformes Berg, 1940 - sturgeons Family Acipenseridae Bonaparte, 1832 - sturgeons Family †Chondrosteidae Egerton, 1858 Family †Errolichthyidae Lehman, 1952 Family Polyodontidae Bonaparte, 1835 - paddlefishes