Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade Teleostomi Bonaparte, 1836
               Euteleostomi - bony vertebrates
                 Class Actinopterygii Woodward, 1891 - ray-finned fishes
                   Subclass Chondrostei Müller, 1844 [monophyletic?]
                     Order Acipenseriformes Berg, 1940 - sturgeons
                       Suborder Acipenseroidei
                         Family Polyodontidae Bonaparte, 1835 - paddlefishes
                           1 [plesion] Genus †Protopsephurus Lu, 1994
                           2.1 [plesion] Genus †Paleopsephurus MacAlpin, 1941
                           2.2.1.1 [plesion] Genus †Crossopholis Cope, 1883
                           2.2.1.2 Genus Polyodon Schneider, 1801
                           2.2.2 Genus Psephurus Günther, 1873 [monotypic]