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 Neopterygii Regan, 1923
                     [plesion] Order †Pachycormiformes Berg, 1940 [monotypic]
                       Family †Pachycormidae Woodward, 1895
                         1 Genus †Asthenocormus Woodward, 1895
                         2 Genus †Euthynotus Wagner, 1860
                         3 Genus †Hypsocormus Wagner, 1860
                         4 Genus †Leedsichthys Woodward, 1889
                         5 Genus †Orthocormus Weitzel, 1930
                         6 Genus †Pachycormus Agassiz, 1833
                         7 Genus †Prosauropsis Sauvage, 1893
                         8 Genus †Protosphyraena Leidy, 1857