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 Acipenseridae Bonaparte, 1832 - sturgeons
                           Subfamily Acipenserinae Bonaparte, 1832
                             Tribe Scaphirhynchini Bonaparte, 1846
                               1 Genus Pseudoscaphirhynchus Nikolski, 1900
                               2 Genus Scaphirhynchus Heckel, 1835