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]
     †Neosauropoda Bonaparte 1986 [Wilson & Sereno 1998]
       †Diplodocoidea Upchurch 1995 [Wilson & Sereno 1998] see Superfamily Diplodocoidea Marsh, 1884
         †Flagellicaudata Harris & Dodson 2004
           †Dicraeosauridae Huene 1956 [Sereno 1998] see Family Dicraeosauridae Janensch, 1929
             1 Genus †Suuwassea Harris & Dodson, 2004
             2.1 Genus †Amargasaurus Salgado & Bonaparte, 1991
             2.2.1 Genus †Brachytrachelopan Rauhut, Remes, Fechner, Cladera & Puerta, 2005
             2.2.2 Genus †Dicraeosaurus Janensch, 1914