Dinosauria Owen 1841 [Padian & May 1993], nom. cl. inval. see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
   †Prosauropoda Huene 1920 [Sereno 1998] see Suborder Prosauropoda Huene, 1920
     †Sauropoda Marsh 1878 [Salgado et al. 1997]
       †Eusauropoda Upchurch 1995
         †Neosauropoda Bonaparte 1986 [Wilson & Sereno 1998]
           1 †Diplodocoidea Upchurch 1995 [Wilson & Sereno 1998] see Superfamily Diplodocoidea Marsh, 1884
           2.1 Genus †Haplocanthosaurus Hatcher, 1903
           2.2 †Macronaria Wilson & Sereno 1998