Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Class Osteichthyes Huxley, 1880 [paraphyletic] - bony fishes see [unranked] Euteleostomi
         Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
           Infraclass Chondrostei Müller, 1844 see Subclass Chondrostei Müller, 1844
             Order Acipenseriformes Berg, 1940 - sturgeons
               Suborder †Chondrosteoidei Grande & Bemis, 1991
                 1 ?Family †Errolichthyidae Lehman, 1952
                 2 Family †Chondrosteidae Egerton, 1858