After McKenna & Bell, 1997, Rougier, Novacek, Pascual & Gelfo, 2000, Gelfo & Pascual, 2001, Rougier, Forasiepi, Hill & Novacek, 2009, Rougier, Apesteguia & Gaetano, 2011 and Rougier, Wible, Beck & Apesteguía, 2012

<==o †Dryolestida Prothero, 1981 [paraphyletic sensu Rougier, Wible, Beck & Apesteguía, 2012]
   |?- †Menacodon rarus
   |?- †Parungulatum rectangularis Bonaparte, 1999
   |?-o †Symmetrodontoides Fox, 1979 [sensu Bonaparte, 1999, has been treated as a Spalacotheroid by Cifelli, Wible & Jenkins jr., 1998.]
   |  |-- †S. foxi Cifelli & Madsen, 1986
   |  |-- †S. canadensis Fox, 1979
   |  `-- †S. oligodentos Cifelli, 1990c
   |?-o †Casamiqueliidae Bonaparte, 1999
   |  |?- †Casamiquelia Bonaparte, 1990 [after Averianov, 2002]
   |  |-- †Rougiertherium tricuspes Bonaparte, 1999
   |  `-- †Alamitherium bishopi Bonaparte, 1999
   |?- †Brandonia Bonaparte, 1992 [Brandoniidae Bonaparte, 1992]
   |-- †Donodon Sigogneau-Russell, 1991 [Donodontidae Sigogneau-Russell, 1991]
   `--+-- †Dryolestidae Marsh, 1879 [Dryolestida sensu stricto (Rougier, Wible, Beck & Apesteguía, 2012)]
      `--+-- Boreosphenida Luo, Cifelli, & Kielan-Jaworowska, 2001 (therian mammals and relatives)
         `--+-- †Paurodontidae Marsh, 1887 [non Paurodontidae Thorne, 1941, a nematode-family (Dykes, 2001)]
            `--o †Meridiolestida Rougier, Apesteguia & Gaetano, 2011
               |--+-- †Leonardus cuspidatus Bonaparte, 1990
               |  `--+-- †Cronopio dentiacutus Rougier, Apesteguia & Gaetano, 2011
               |     `--o †Necrolestidae Ameghino, 1894
               |        `--o †Necrolestes Ameghino, 1894 sensu Rougier, Wible, Beck & Apesteguía, 2012
               |           |-- †N. patagonensis Ameghino, 1891
               |           `-- †N. mirabilis Goin et al., 2007
               `--+-- †Reigitherium bunodontum Bonaparte, 1990 [Reigitheriidae Bonaparte, 1990] [is a docodont, not dryolestoid? (Pascual, Goin, Gonzalez, Ardolino & Puerta, 2000)]
                  `--o †Mesungulatidae Bonaparte, 1986 sensu Rougier et al., 2009
                     |-- †Peligrotherium tropicalis Bonaparte, Van Valen & Kramartz, 1993 [Peligotheriidae Bonaparte, Van Valen & Kramartz, 1993]
                     `--+-- †Mesungulatum houssayi Bonaparte & Soria, 1985
                        `-- †Coloniatherium cilinskii Rougier, Forasiepi, Hill & Novacek, 2009

After McKenna & Bell, 1997, Rougier, Novacek, Pascual & Gelfo, 2000, and Gelfo & Pascual, 2001

<==o †Dryolestida
   |?- †Menacodon
   |?- †Parungulatum
   |?- †Symmetrodontoides
   |?-o †Casamiqueliidae
   |  |?- †Casamiquelia
   |  |-- †Rougiertherium
   |  `-- †Alamitherium
   |-- †Donodon
   `--+--+-- †Peligrotherium
      |  `-- †Mesungulatum
      `--+-- †Reigitherium
         `--+-- †Brandonia
            `--+-- †Paurodontidae
               `-- †Dryolestidae

Reference(s):