| Eorasaurus Temporal range: Late Permian,
| |
|---|---|
| |
| Cervical vertebrae of specimens PIN 156/108 (H-L) and PIN 156/109 (A-G) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Archosauromorpha |
| Genus: | †Eorasaurus Sennikov, 1997 |
| Type species | |
| †Eorasaurus olsoni Sennikov, 1997
| |
Eorasaurus is an extinct genus of archosauromorph reptile known from the middle late Permian (late Capitanian or early Wuchiapingian age) of Tatarstan, European Russia. It contains a single species, Eorasaurus olsoni. When originally described by Sennikov (1997), Eorasaurus was identified as an early archosauromorph and assigned to the family Protorosauridae,[1] Ezcurra et al. (2014) and Ezcurra (2016) later reclassified Eorasaurus and placed it within the group Archosauriformes.[2][3] Eorasaurus is based solely on scant fossil material from the neck region, and is thus considered an unstable taxon in phylogenetic analyses. If Eorasaurus is an archosauriform, it would be the oldest known member of the group and would pre-date the previous record holder (the proterosuchid Archosaurus).[2]
- ^ Sennikov, Andrey G. (1997). "An enigmatic reptile from the Upper Permian of the Volga River Basin". Paleontologicheskii Zhurnal. 31 (1): 94–101.
- ^ a b Ezcurra, M. N. 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. Bibcode:2014PLoSO...989165E. doi:10.1371/journal.pone.0089165. PMC 3937355. PMID 24586565.
- ^ Ezcurra, Martín D. (2016-04-28). "The phylogenetic relationships of basal archosauromorphs, with an emphasis on the systematics of proterosuchian archosauriforms". PeerJ. 4: e1778. doi:10.7717/peerj.1778. ISSN 2167-8359. PMC 4860341. PMID 27162705.