†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
                 1 Genus †Drusilasaura Navarrete, Casal & Martínez, 2011 [monotypic]
                 2 Genus †Quetecsaurus González-Riga & David, 2014 [monotypic]
                 3 Genus †Mendozasaurus González Riga, 2003 [monotypic]
                 4.1 Genus †Futalognkosaurus Calvo, Porfiri, González-Riga & Kellner, 2007 [monotypic]
                 4.2.1 Genus †Argentinosaurus Bonaparte & Coria, 1993 [monotypic]
                 4.2.2.1 Genus †Notocolossus González-Riga, Lamanna, Ortiz David, Calvo & Coria, 2016 [monotypic]
                 4.2.2.2 Genus †Patagotitan Carballido, Pol, Otero, Cerda, Salgado, Garrido, Ramezani, Cúneo & Krause, 2017 [monotypic]
                 4.2.2.3 Genus †Puertasaurus Novas, Salgado, Calvo & Agnolin, 2005 [monotypic]