Diapsida Osborn 1903 [Laurin 1991] see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
   Archosauromorpha xxxHuene 1946 [Gauthier, Kluge & Rowe 1988] see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
     Archosauria Cope, 1869
       Ornithosuchia see [unranked] Avesuchia Benton, 1999
         Ornithodira Gauthier 1986 see Clade Ornithodira Gauthier 1986 [M. Ezcurra, S. Nesbitt, M. Bronzati, F. Dalla Vecchia, F. Agnolin, R. Benson, ..., M. Langer 2020]
           Dinosauria Owen 1841 [Padian & May 1993], nom. cl. inval. see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
             Saurischia Seeley 1887 [Gauthier 1986], nom. cl. inval. see Clade Saurischia Seeley 1888 [Gauthier, Langer, Novas, Bittencourt & Ezcurra 2020]
               †Sauropodomorpha Huene 1932 [Salgado et al. 1997] see Order Sauropodomorpha Huene, 1932
                 †Sauropoda Marsh 1878 [Salgado et al. 1997]
                   †titanosaurs see Clade Neosauropoda Bonaparte 1986 [Wilson & Sereno 1998]
                     Family †Diplodocidae Marsh, 1884