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 †Prosauropoda Huene, 1920 see Suborder Prosauropoda Huene, 1920
       Family †Melanorosauridae von Huene, 1929
         Genus †Riojasaurus Bonaparte, 1969