After Kammerer & Angielczyk, 2009, and Botha-Brink & Angielczyk, 2010

<==o Dicynodontoidea Cope, 871 sensu Cluver & King, 1981 and Kammerer & Angielczyk, 2009
   |--o †Delectosaurus Kurkin, 2001
   |  |-- †D. arefjevi
   |  `-- †D. berezhanensis
   `==o †Dicynodontidae Owen, 1859
      |-- †“Dicynodon” vanhoepeni
      |-- †“Dicynodon” roberti
      |-- †“Dicynodon” trigonocephalus
      |-- †“Dicynodon” scopulosa
      |-- †“Dicynodon” amalitzkii Sushkin, 1926
      |-- †“Dicynodon” trautscholdi Amalitskii, 1922 [Gordonia annae Amalitskii, 1922, Oudenodon venyokovi Amalitskii, 1922, Dicynodon annae (Amalitskii, 1922)]
      |-- †“Dicynodon” huenei
      |-- †“Dicynodon” bathyrhynchus
      |-- †“Dicynodon” leoniceps
      |-- †“Dicynodon” bogdaensis
      |-- †“Dicynodon” limbus
      |-- †“Dicynodon” traquairi [Gordonia traquairi]
      |-- †“Dicynodon” sinkianensis
      |-- †“Dicynodon” bolorhinus
      |-- †“Dicynodon” leontops
      |-- †“Dicynodon” lissops
      |-- †“Dicynodon” osborni
      |-- †Dicynodon lacerticeps Owen, 1845 [Daptocephalus; Gordonia; Oudenodon]
      `--+--o †Lystrosauridae Broom, 1903 [Dicynodontidae: Kannemeyeriinae: Lystrosaurini Broom, 1903]
         |  |-- †Kwazulusaurus shakai Maisch, 2002
         |  `--o †Lystrosaurus Cope, 1870 [Prolystrosaurus]
         |     |-- †L. murrayi (Huxley, 1859) Broom, 1932
         |     |-- †L. latirostris
         |     |-- †L. mccaigi
         |     |-- †L. declivis
         |     |-- †L. hedini
         |     |-- †L. shichanggouensis
         |     |-- †L. strigops
         |     |-- †L. robustus
         |     `--+-- †L. georgi Kalandadze, 1975
         |        `-- †L. curvatus
         `--+-- †Vivaxosaurus permirus Kalandadze & Kurkin, 2000
            `-- †Kannemeyeriiformes sensu Maisch, 2001

After Cox 1998

<==o Dicynodontoidea
   |--o †Oudenodontidae
   |  |?- †Cteniosaurus
   |  |-- †Tropidostoma
   |  `--+-- †Oudenodon
   |     `--o †Pelorocyclopinae
   |        |-- †Platycyclops
   |        |-- †Rhachiocephalus
   |        `-- †Odontocyclops
   `--+--o †Dicynodontidae
      |  |-- †Dicynodon
      |  `-- †Gordonia
      `--+?- †Propelanomodon
         |--o †Aulacocephalodontidae
         |  |?- †Digalodon
         |  |-- †Aulacephalodon
         |  `--+-- †Geikia
         |     `-- †Pelanomodon
         `--+--o †Lystrosauridae
            |  |-- †Kwazulusaurus
            |  `-- †Lystrosaurus
            `--+--o †Kannemeyeriidae
               |  |?- †Kannemeyeriidae gen. et sp. indet. (L.Cret. Aust.)
               |  |-- †Angonisaurus
               |  |?- †Calleonasus furvus Kalandadze, 1985
               |  |-- †Chanaria
               |  |-- †Dolichuranus [Rhopalorhinus]
               |  |-- †Rhinocerocephalus
               |  |-- †Sangusaurus
               |  |-- †Zambiasaurus
               |  |-- †Tetragonias
               |  |-- †Vinceria
               |  |-- †Wadiasaurus
               |  |-- †Jachaleria
               |  |?-o †Kannemeyeriinae
               |  |  |-- †Ischigualastia
               |  |  |-- †Kannemeyeria
               |  |  |-- †Parakennemeyeria
               |  |  `-- †Rabidosaurus
               |  |?-o †Sinokannemeyeriinae
               |  |  |-- †Uralokannemeyeria
               |  |  |-- †Rhadiodromus
               |  |  `-- †Sinokannemeyeria
               |  `?-o †Placeriinae
               |     |-- †Rechnisaurus [Proplacerias]
               |     |-- †Edaxosaurus
               |     `-- †Placerias
               `--+--o †Shanisiodontidae
                  |  |-- †Rhinodicynodon
                  |  `-- †Shansiodon
                  `?-o †Stahleckeriidae
                     |-- †Elephantosaurus
                     |-- †Elatosaurus
                     `-- †Stahleckeria

Reference(s):

 

Special thanks to:

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