Sauria

Saurians; Temporal range: Capitanian–Present,
	clockwise from top left: Agkistrodon contortrix (the copperhead, a snake), Dinemellia dinemelli (the white-faced buffalo-weaver, a bird), various extinct ornithischian dinosaurs, Chelonia mydas (the green sea turtle), Anurognathus (an extinct pterosaur), and Alligator mississippiensis (the american alligator, a crocodilian)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Neodiapsida
Clade:	Sauria; Macartney, 1802
Groups
	Lepidosauromorpha (includes the tuatara, lizards, snakes, and various extinct taxa); Archelosauria Archosauromorpha (includes crocodilians, dinosaurs (including birds), and various extinct taxa); Pantestudines (includes turtles); ; †Kuehneosauridae; †Choristodera?; †Sauropterygia?; †Ichthyosauromorpha?; †Thalattosauria?;

Sauria is the clade containing the most recent common ancestor of Archosauria (which includes crocodilians and birds) and Lepidosauria (which includes squamates and the tuatara), and all its descendants.^[1] Since most molecular phylogenies recover turtles as more closely related to archosaurs than to lepidosaurs as part of Archelosauria, Sauria can be considered the crown group of diapsids, or reptiles in general.^[2] Depending on the systematics, Sauria includes all modern reptiles^[3] or most of them (including birds, a type of archosaur) as well as various extinct groups.^[4]

Sauria lies within the larger total group Sauropsida, which also contains various stem-reptiles which are more closely related to reptiles than to mammals.^[3] Prior to its modern usage, "Sauria" was used as a name for the suborder occupied by lizards, which before 1800 were considered crocodilians.

^ Gauthier, J. A., Kluge, A. G., & Rowe, T. (1988). The early evolution of the Amniota. The phylogeny and classification of the tetrapods, 1, 103-155.
^ Simões, Tiago R.; Kammerer, Christian F.; Caldwell, Michael W.; Pierce, Stephanie E. (2022-08-19). "Successive climate crises in the deep past drove the early evolution and radiation of reptiles". Science Advances. 8 (33): eabq1898. doi:10.1126/sciadv.abq1898. ISSN 2375-2548. PMC 9390993. PMID 35984885.
^ ^a ^b Ezcurra, M. D.; Scheyer, T. M.; Butler, R. J. (2014). "The origin and early evolution of Sauria: reassessing the Permian saurian fossil record and the timing of the crocodile-lizard divergence". PLOS ONE. 9 (2): e89165. doi:10.1371/journal.pone.0089165. PMC 3937355. PMID 24586565.
^ Li, Chun; Fraser, Nicholas C.; Rieppel, Olivier; Wu, Xiao-Chun (August 2018). "A Triassic stem turtle with an edentulous beak". Nature. 560 (7719): 476–479. doi:10.1038/s41586-018-0419-1. ISSN 0028-0836. PMID 30135526. S2CID 52067286.

[1] Gauthier, J. A., Kluge, A. G., & Rowe, T. (1988). The early evolution of the Amniota. The phylogeny and classification of the tetrapods, 1, 103-155.

[2] Simões, Tiago R.; Kammerer, Christian F.; Caldwell, Michael W.; Pierce, Stephanie E. (2022-08-19). "Successive climate crises in the deep past drove the early evolution and radiation of reptiles". Science Advances. 8 (33): eabq1898. doi:10.1126/sciadv.abq1898. ISSN 2375-2548. PMC 9390993. PMID 35984885.

[:0-3] Ezcurra, M. D.; Scheyer, T. M.; Butler, R. J. (2014). "The origin and early evolution of Sauria: reassessing the Permian saurian fossil record and the timing of the crocodile-lizard divergence". PLOS ONE. 9 (2): e89165. doi:10.1371/journal.pone.0089165. PMC 3937355. PMID 24586565.

[Li2018-4] Li, Chun; Fraser, Nicholas C.; Rieppel, Olivier; Wu, Xiao-Chun (August 2018). "A Triassic stem turtle with an edentulous beak". Nature. 560 (7719): 476–479. doi:10.1038/s41586-018-0419-1. ISSN 0028-0836. PMID 30135526. S2CID 52067286.

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Saurians Temporal range: Capitanian–Present,

clockwise from top left: Agkistrodon contortrix (the copperhead, a snake), Dinemellia dinemelli (the white-faced buffalo-weaver, a bird), various extinct ornithischian dinosaurs, Chelonia mydas (the green sea turtle), Anurognathus (an extinct pterosaur), and Alligator mississippiensis (the american alligator, a crocodilian)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Neodiapsida
Clade:	Sauria Macartney, 1802
Groups
Lepidosauromorpha (includes the tuatara, lizards, snakes, and various extinct taxa) Archelosauria Archosauromorpha (includes crocodilians, dinosaurs (including birds), and various extinct taxa) Pantestudines (includes turtles) †Kuehneosauridae †Choristodera? †Sauropterygia? †Ichthyosauromorpha? †Thalattosauria?