Mounted skeleton of Lystrosaurus murrayi in the Muséum national d'histoire naturelle, Paris, photographed by FunkMonk.

Belongs within: Therapsida.
Contains: Kannemeyeriiformes.

The Late Permian to Cretaceous Dicynodontia (though they did not survive past the Late Triassic outside Australia) were herbivorous synapsids that were the world's dominant herbivores during their peak. The name 'dicynodont' refers to the pair of large tusks that were generally the only teeth in their beaked jaws.

Synapomorphies (from Kemp 1988): Zygomatic arch dorsally displaced; dentaries fused at symphysis; articular surface of lower jaw sloping posteroventrally; horn developed on the jaws; intramandibular fenestra present; premaxillary secondary palate present.

    |  i. s.: Cistecephalus M00
    |         Emydoses M00
    |         Otsheria K88
    |         Venyukovioidea TT05
    |           |  i. s.: Suminia getmanovi Ivakhnenko 1994 TT05
    |           `--Venyukoviidae TT05
    |                |--Ulemica efremovi Ivakhnenko 1996 TT05
    |                `--Venjukovia K88
    |--Kombuisia M00
    |--Myosaurus M00
    `--Pristerodontia M00
         |  i. s.: Odontocyclops M00
         |--Lystrosaurus [Lystrosauridae] M00
         |    `--L. murrayi M00
         `--+--Dicynodon [Dicynodontidae] M00
            |    `--D. lacerticeps M00
            `--+--Dinanomodon M00
               `--Kannemeyeriiformes M00


[K88] Kemp, T. S. 1988. Interrelationships of the Synapsida. In The Phylogeny and Classification of the Tetrapods, vol. 2. Mammals (M. J. Benton, ed.) pp. 1-22. Clarendon Press: Oxford.

[M00] Maisch, M. W. 2000. Observations on Karoo and Gondwana vertebrates. Part 2: A new skull-reconstruction of Stahleckeria potens von Huene, 1935 (Dicynodontia, Middle Triassic) and a reconstruction of kannemeyeriiform phylogeny. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 220 (1): 127-152.

[TT05] Tverdokhlebov, V. P., G. I. Tverdokhlebova, A. V. Minikh, M. V. Surkov & M. J. Benton. 2005. Upper Permian vertebrates and their sedimentological context in the South Urals, Russia. Earth-Science Reviews 69: 27-77.

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