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
         Genus †Apatosaurus Marsh, 1877
         Genus †Dicraeosaurus Janensch, 1914
         Genus †Diplodocus Marsh, 1878
         Genus †Mamenchisaurus Young, 1954