Saurischia Seeley 1887 [Gauthier 1986], nom. cl. inval. see Clade Saurischia Seeley 1888 [Gauthier, Langer, Novas, Bittencourt & Ezcurra 2020]
   †Sauropoda Marsh 1878 [Salgado et al. 1997]
     †Diplodocoidea Upchurch 1995 [Wilson & Sereno 1998] see Superfamily Diplodocoidea Marsh, 1884
       †Diplodocimorpha Calvo & Salgado, 1995
         †Rebbachisauridae Bonaparte 1997 [Wilson 2004] see Family Rebbachisauridae Bonaparte, 1997
           Genus †Nopcsaspondylus Apesteguía, 2007
           Genus †Xenoposeidon Taylor & Naish, 2007
           1 Genus †Amazonsaurus Carvalho, Avilla & Salgado, 2003
           2.1 Genus †Zapalasaurus Salgado, Carvalho & Garrido, 2006
           2.2 Genus †Histriasaurus Dalla Vecchia, 1998
           2.3.1 Genus †Comahuesaurus Carballido, Salgado, Pol, Canudo & Garrido, 2012
           2.3.2.1 Genus †Lavocatisaurus Canudo, Carballido, Garrido & Salgado, 2018 [monotypic]
           2.3.2.2 †Khebbashia Fanti et al., 2015