Tetrapoda Goodrich, 1930
   Amniota Haeckel, 1866 - amniotes
     Eureptilia Olson, 1947
       Diapsida Osborn 1903 [Laurin 1991]
         Neodiapsida Benton 1985 [Laurin 1991] see Clade Neodiapsida Benton 1985 [Laurin 1991] {Reisz, Modesto & Scott 2011}
           Archosauromorpha Huene 1946 [Gauthier, Kluge & Rowe 1988] {Laurin 1991}
             Archosauria Cope, 1869
               Avesuchia Benton, 1999
                 Avemetatarsalia Benton 1999
                   Ornithodira Gauthier 1986
                     Dinosauromorpha Benton 1985
                       Dinosauriformes Novas 1992
                         Dinosauria Owen 1841
                           Saurischia Seeley 1887 [Gauthier 1986]
                             Eusaurischia Padian et al., 1999
                               1.1? Genus †Guaibasaurus Bonaparte, Ferigolo & Ribeiro, 1999 [monotypic]
                               1.2 Theropoda Marsh 1881 [Gauthier 1986], nom. cl. inval.
                               2.1 †Saturnalia Langer, Abdala, Richter & Benton, 1999 [monotypic]
                               2.2 †Sauropodomorpha Huene 1932 [Salgado et al. 1997] see Order Sauropodomorpha Huene, 1932