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Mesosaur
| Mesosaurs Temporal range: Cisuralian,
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|---|---|
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| Mesosaurus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | †Parareptilia |
| Order: | †Mesosauria Seeley, 1892 |
| Family: | †Mesosauridae Baur, 1889 |
| Genera | |
Mesosaurs ("middle lizards") were a group of small aquatic reptiles that lived during the early Permian period (Cisuralian), roughly 299 to 270 million years ago. Mesosaurs were the first known aquatic reptiles, having apparently returned to an aquatic lifestyle from more terrestrial ancestors. It is uncertain which and how many terrestrial traits these ancestors displayed; recent research cannot establish with confidence if the first amniotes were fully terrestrial, or only amphibious.[1] Most authors consider mesosaurs to have been aquatic,[1][2] although adult animals may have been amphibious, rather than completely aquatic, as indicated by their moderate skeletal adaptations to a semiaquatic lifestyle.[3][4] Similarly, their affinities are uncertain; they may have been among the most basal sauropsids[5][6] or among the most basal parareptiles (in the case of which parareptiles were basal sauropsids).[7][8]
- ^ a b Cite error: The named reference
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SM06was invoked but never defined (see the help page). - ^ Cite error: The named reference
GP08was invoked but never defined (see the help page). - ^ Pablo Nuñez Demarco et al. Was Mesosaurus a Fully Aquatic Reptile? Front. Ecol. Evol, published online July 27, 2018; doi: 10.3389/fevo.2018.00109
- ^ Cite error: The named reference
ML&RR95was invoked but never defined (see the help page). - ^ Laurin, Michel; Piñeiro, Graciela H. (2017). "A Reassessment of the Taxonomic Position of Mesosaurs, and a Surprising Phylogeny of Early Amniotes". Frontiers in Earth Science. 5: 88. Bibcode:2017FrEaS...5...88L. doi:10.3389/feart.2017.00088. hdl:20.500.12008/33548.
- ^ Cite error: The named reference
MSP99was invoked but never defined (see the help page). - ^ MacDougall, M.J.; Modesto, S.P.; Brocklehurst,N.; Verriere, A.; Reisz, R.R.; Fröbisch, J. (2018). "Response: A Reassessment of the Taxonomic Position of Mesosaurs, and a Surprising Phylogeny of Early Amniotes". Front. Earth Sci. 6:99 doi: 10.3389/feart.2018.00099
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