†Sauropoda Marsh 1878 [Salgado et al. 1997]
   †Neosauropoda Bonaparte 1986 [Wilson & Sereno 1998]
     †Macronaria Wilson & Sereno 1998
       †Titanosauriformes Salgado, Coria & Calvo 1997
         †Somphospondyli Wilson & Sereno 1998
           †Titanosauria Bonaparte & Coria 1993
             †Lithostrotia Upchurch, Barrett & Dodson 2004
               †Lognkosauria Calvo et al. 2007
                 Genus †Futalognkosaurus Calvo, Porfiri, González-Riga & Kellner, 2007 [monotypic]
                   1 †Futalognkosaurus dukei J.O. Calvo et al., 2007