†Sauropoda Marsh 1878 [Salgado et al. 1997]
†Neosauropoda Bonaparte 1986 [Wilson & Sereno 1998]
1.1 Genus †Nigersaurus Sereno, Beck, Dutheil, Larsson, Lyon, Moussa, Sadleir, Sidor, Varricchio, Wilson & Wilson, 1999
1.2.1 Genus †Apatosaurus Marsh, 1877
1.2.2 Genus †Diplodocus Marsh, 1878
2 †Macronaria Wilson & Sereno 1998