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Lystrosauridae

- Lystrosauridae

Synonymy list
YearName and author
1903Lystrosauridae Broom p. 294
1904Lystrosauridae Osborn p. 103
1954Lystrosauridae Haughton and Brink p. 6
1982Lystrosauridae Kemp p. 348
1988Lystrosauridae Carroll
2008Lystrosauridae Ivakhnenko
2008Lystrosauridae Li and Sun p. 389
2009Lystrosauridae Kammerer and Angielczyk
2011Lystrosauridae Kammerer et al. p. 140

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
RankNameAuthor
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
Anomodontia(Owen 1859)
Chainosauria()
Dicynodontia(Owen 1859)
Bidentalia()
DicynodontoideaCluver and King 1983
familyLystrosauridae
familyLystrosauridae

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.

Diagnosis
ReferenceDiagnosis
R. Broom 1903Dentition as in Dicynodontidae. A pair ol poslfrontals present; also a distinct preparietal bone. Interclavicle small. No cleithrum.
C. F. Kammerer and K. D. Angielczyk 2009As 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.