|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was reranked as the unranked clade Lystrosauridae by Kammerer and Angielczyk (2009).
It was assigned to Anomodontia by Broom (1903); to Dicynodontia by Osborn (1904); to Anomodontia by Haughton and Brink (1954); to Dicynodontia by Kemp (1982); to Pristerodontia by Carroll (1988); to Dicynodontia by Li and Sun (2008); to Dicynodontida by Ivakhnenko (2008); and to Dicynodontoidea by Kammerer and Angielczyk (2009) and Kammerer et al. (2011).
|Year||Name and author|
|1903||Lystrosauridae Broom p. 294|
|1904||Lystrosauridae Osborn p. 103|
|1954||Lystrosauridae Haughton and Brink p. 6|
|1982||Lystrosauridae Kemp p. 348|
|2008||Lystrosauridae Li and Sun p. 389|
|2009||Lystrosauridae Kammerer and Angielczyk|
|2011||Lystrosauridae Kammerer et al. p. 140|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|R. Broom 1903||Dentition as in Dicynodontidae. A pair ol poslfrontals present; also a distinct preparietal bone. Interclavicle small. No cleithrum.|
|C. F. Kammerer and K. D. Angielczyk 2009||As currently defined, Lystrosauridae includes only the genera Lystrosaurus and Kwazulusaurus. The latter taxon has only been included in one phylogenetic analysis (Maisch, 2002a). Therefore, in addition to listing autapomorphies from the analyses of Angielczyk (2007), Fröbisch (2007), and Fröbisch & Reisz (2008), we also include autapomorphies identified by Maisch (2002a). Maisch (2002a) identified two autapomorphies of Lystrosauridae: (1) ectopterygoid absent; (2) snout region short and deep, strongly extended ventrally. Autapomorphies recognized in common by Angielczyk (2007), Fröbisch (2007), and Fröbisch & Reisz (2008) are: (1) parietals widely exposed on the skull roof; (2) anterior portion of the palatine does not contact the premaxilla. Cluver (1971) provided a detailed diagnosis of Lystrosaurus in his thorough treatment of the cranial morphology of the genus, and Maisch (2002a) presented the only diagnosis of Kwazulusaurus to date. The most distinctive character of lystrosaurids is the steeply downturned snout, although this feature is more strongly developed in Lystrosaurus than Kwazulusaurus.|