Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Reptilia Linnaeus, 1758 - reptiles
       Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
         Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
           Superorder Archosauria Cope, 1869 - archosaurs see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
             Order †Saurischia Seeley, 1887 see Clade Saurischia Seeley 1888 [Gauthier, Langer, Novas, Bittencourt & Ezcurra 2020]
               Suborder †Sauropodomorpha Huene, 1932 see Order Sauropodomorpha Huene, 1932
                 Infraorder †Sauropoda Marsh, 1878 see Clade Sauropoda Marsh 1878 [Salgado et al. 1997]
                   Family †Diplodocidae Marsh, 1884
                     01 Genus †Amphicoelias Cope, 1877
                     02 Genus †Apatosaurus Marsh, 1877
                     03 ?Genus †Atlantosaurus Marsh, 1877, nom. dub.
                     04 Genus †Barosaurus Marsh, 1890
                     05 Genus †Cetiosauriscus von Huene, 1928
                     06 Genus †Diplodocus Marsh, 1878
                     07 Genus †"Hisanohamasaurus" Lambert, 1990, nom. nud.
                     08 Genus †Megacervixosaurus Zhao, 1983, nom. nud.
                     09 Genus †Microdontosaurus Zhao, 1983, nom. nud.
                     10 Genus †Mongolosaurus Gilmore, 1933
                     11 Genus †Nemegtosaurus Nowinski, 1971
                     12 Genus †Quaesitosaurus Bannikov & Kurzanov, 1983
                     13 Genus †"Seismosaurus" Gillette, 1991 see Genus Diplodocus Marsh, 1878
                     14 Genus †Supersaurus Jensen, 1985
                     15 Genus †Tornieria Sternfeld, 1911