Xenocretosuchus
| Xenocretosuchus Temporal range: Aptian, | |
|---|---|
Scientific classification  | |
| 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 | |
| |
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]
Alongside Montirictus and Fossiomanus, it is amongst the latest known non-mammaliform synapsids, extending their range to the Early Cretaceous.
Palaeobiology
Locomotion
Xenocretosuchus possessed a highly developed mandibular middle ear, which has been interpreted as an indication of fossoriality in the genus.[6]
References
- ↑ Fossilworks. "Xenocretosuchus." Retrieved from
- ↑ Palaeos. "Cynodontia: Tritylodontidae." Retrieved from
- ↑ Lopatin & Agadjanian, 2008. "A Tritylodont (Tritylodontidae, Synapsida) from the Mesozoic of Yakutia." Retrieved from
- ↑ Averianov, Alexander Olegovich; Martin, Thomas; Lopatin, Alexey Vladimirovich; Schultz, J. A.; Skutschas, Pavel P.; Rico, S.; Krasnolutskii, S. A. (2017). "A tritylodontid synapsid from the Middle Jurassic of Siberia and the taxonomy of derived tritylodontids". Journal of Vertebrate Paleontology. 37 (5) e1363767. doi:10.1080/02724634.2017.1363767. S2CID 90249441.
- ↑ Liu, Lu; Zhou, Chang-Fu; Wang, Jia-Shu; Xue, Jin-Zhuang (6 July 2022). "A new tritylodontid from the Middle Jurassic Shaximiao Formation of western Hubei, China". Historical Biology: 1–10. doi:10.1080/08912963.2022.2094262. ISSN 0891-2963.
- ↑ Averianov, Alexander Olegovich; Lopatin, Alexey Vladimirovich; Slobodin, Dmitry A.; Skutschas, Pavel P.; Vladimirova, Olga N. (7 August 2025). "Dentary–squamosal jaw articulation in a late surviving tritylodontid synapsid from the Early Cretaceous of Western Siberia, Russia". Journal of Mammalian Evolution. 32 (3). doi:10.1007/s10914-025-09775-2. ISSN 1064-7554. Retrieved 13 August 2026 – via Springer Nature Link.
