After Kammerer & Angielczyk, 2009

<==o Dicynodontoidea Cluver & King, 1983
   |-- †Oudenodontidae
   `--+-- †Dicynodontidae Owen, 1859
      `--+?- †Propelanomodon devilliersi
         |--o †Aulacocephalodontidae Cluver & King, 1983 [Geikiidae v. Huene, 1948 sensu Maisch & Gebauer, 2005]
         |  |?- †Digalodon
         |  |--o †Aulacephalodon Seeley, 1898 [Aulacocephalodon (lapsus calami)]
         |  |  |-- †A.? sp.
         |  |  |-- †A. bainii (Owen)
         |  |  `-- †A. laticeps
         |  `--+--o †Geikia Newton, 1893 sensu Maisch & Gebauer, 2005
         |     |  |?- †G. mirabilis
         |     |  |-- †G. elginensis Newton, 1913
         |     |  `-- †G. locusticeps (v. Huene, 1942) Rowe, 1980 [Dicynodon locusticeps v. Huene, 1942] [incl. Pelanomodon tuberosus v. Huene, 1942 sensu Maisch & Gebauer, 2005]
         |     `--o †Pelanomodon Broom, 1938
         |        |-- †P. halli 
         |        |-- †P. kitchingi
         |        |-- †P. moschops
         |        `-- †P. rubidgei
         `--+--o †Lystrosauridae Broom, 1903 [Dicynodontidae: Kannemeyeriinae: Lystrosaurini Broom, 1903]
            |  |-- †Kwazulusaurus shakai Maisch, 2002
            |  `--o †Lystrosaurus Cope, 1870 [Prolystrosaurus]
            |     |-- †L. murrayi (Huxley, 1859)
            |     |--+-- †L. georgi Kalandadze, 1975
            |     |  `-- †L. curvatus
            |     |-- †L. latirostris
            |     |-- †L. mccaigi
            |     |-- †L. sp.
            |     `-- †L. strigops
            `--+-- †Kannemeyeriidae (Huene, 1948) [Dicynodontidae: Kannemeyeriinae Huene, 1948]
               `--+--o †Shanisiodontidae Cox, 1965
                  |  |-- †Rhinodicynodon gracile Kalandadze, 1970
                  |  `-- †Shansiodon
                  `?-o †Stahleckeriidae Lehman, 1961 [are advanced kannemayeriids? (Surkov et al., 2005)]
                     |-- †Elephantosaurus jachimovitchi Vjuschkov, 1969
                     |-- †Elatosaurus facetus Kalandadze, 1985
                     `-- †Stahleckeria potens

After Cox 1998

<==o Dicynodontoidea Cluver & King, 1983
   |-- †Oudenodontidae
   `--+-- †Dicynodontidae Owen, 1859
      `--+?- †Propelanomodon devilliersi
         |--o †Aulacocephalodontidae Cluver & King, 1983 [Geikiidae v. Huene, 1948 sensu Maisch & Gebauer, 2005]
         |  |?- †Digalodon
         |  |--o †Aulacephalodon Seeley, 1898 [Aulacocephalodon (lapsus calami)]
         |  |  |-- †A.? sp.
         |  |  |-- †A. bainii (Owen)
         |  |  `-- †A. laticeps
         |  `--+--o †Geikia Newton, 1893 sensu Maisch & Gebauer, 2005
         |     |  |?- †G. mirabilis
         |     |  |-- †G. elginensis Newton, 1913
         |     |  `-- †G. locusticeps (v. Huene, 1942) Rowe, 1980 [Dicynodon locusticeps v. Huene, 1942] [incl. Pelanomodon tuberosus v. Huene, 1942 sensu Maisch & Gebauer, 2005]
         |     `--o †Pelanomodon Broom, 1938
         |        |-- †P. halli 
         |        |-- †P. kitchingi
         |        |-- †P. moschops
         |        `-- †P. rubidgei
         `--+--o †Lystrosauridae Broom, 1903 [Dicynodontidae: Kannemeyeriinae: Lystrosaurini Broom, 1903]
            |  |-- †Kwazulusaurus shakai Maisch, 2002
            |  `--o †Lystrosaurus Cope, 1870 [Prolystrosaurus]
            |     |-- †L. murrayi (Huxley, 1859)
            |     |--+-- †L. georgi Kalandadze, 1975
            |     |  `-- †L. curvatus
            |     |-- †L. latirostris
            |     |-- †L. mccaigi
            |     |-- †L. sp.
            |     `-- †L. strigops
            `--+-- †Kannemeyeriidae (Huene, 1948) [Dicynodontidae: Kannemeyeriinae Huene, 1948]
               `--+--o †Shanisiodontidae Cox, 1965
                  |  |-- †Rhinodicynodon gracile Kalandadze, 1970
                  |  `-- †Shansiodon
                  `?-o †Stahleckeriidae Lehman, 1961 [are advanced kannemayeriids? (Surkov et al., 2005)]
                     |-- †Elephantosaurus jachimovitchi Vjuschkov, 1969
                     |-- †Elatosaurus facetus Kalandadze, 1985
                     `-- †Stahleckeria potens

Reference(s):

 

Special thanks to:

Jos H. M. Dols, for gathering additional information and species.