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Xenocretosuchus is an extinct genus of tritylodont therapsids from the Aptian (Early Cretaceous) Ilek Formation of Siberia, in the Russian Federation.[1] The type species, X. sibiricus, is known only from dental elements,[2] as is X. kolossovi, described from the Batylykh Formation in 2008.[3] Some authors have treated these species as part of the genus Stereognathus, otherwise known from the Middle Jurassic of Britain,[4] but this is rejected by other authors.[5]
| Xenocretosuchus Temporal range: Aptian, | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Family: | †Tritylodontidae |
| Genus: | †Xenocretosuchus Tatarinov & Matchenko, 1999 |
| Type species | |
| Xenocretosuchus sibiricus Tatarinov & Matchenko, 1999 | |
| Other species | |
| |
Alongside Montirictus and Fossiomanus, it is amongst the latest known non-mammaliform synapsids, extending their range to the Early Cretaceous.
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