†[Eusauropoda] Upchurch 1995 †Neosauropoda Bonaparte 1986 [Wilson & Sereno 1998] †Macronaria Wilson & Sereno 1998 †Titanosauriformes Salgado, Coria & Calvo 1997 [Genus †Xenoposeidon Taylor & Naish, 2007 [monotypic]] [†Xenoposeidon proneneukos Taylor & Naish, 2007]