| Mesenosaurus Temporal range: Permian,
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| Mesenosaurus romeri | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Family: | †Varanopidae |
| Subfamily: | †Mycterosaurinae |
| Genus: | †Mesenosaurus Efremov, 1938 |
| Type species | |
| †Mesenosaurus romeri Efremov, 1938
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| Species | |
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Mesenosaurus is an extinct genus of amniote. It belongs to the family Varanopidae. This genus includes two species: the type species Mesenosaurus romeri from the middle Permian (upper Kazanian) Mezen River Basin of northern Russia, and Mesenosaurus efremovi from the early Permian (Artinskian) Richards Spur locality (Oklahoma, United States).[1] M. romeri’s stratigraphic range is the middle to late Guadalupian while M. efremovi’s stratigraphic range is the Cisuralian.[1]
- ^ a b Sigi Maho; Bryan M. Gee; Robert R. Reisz (2019). "A new varanopid synapsid from the early Permian of Oklahoma and the evolutionary stasis in this clade". Royal Society Open Science. 6 (10): Article ID 191297. doi:10.1098/rsos.191297. PMC 6837192. PMID 31824730.