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{{Short description|Extinct genus of reptiles}}
{{Automatic taxobox
{{Speciesbox
| fossil_range = [[Permian]]
| fossil_range = [[Late Permian]], {{fossil range|252}}
| image = Dinosaurium, Archosaurus rossicus 1.jpg
| image = Archosaurus rossicus skull.JPG
| image_width = 250px
| image_upright = 1.15
| image_caption = Restored skull
| image_caption = Restored skull
| display_parents = 2
| display_parents = 2
| taxon = Archosaurus rossicus
| authority = Tatarinov, [[1960 in paleontology|1960]]
| parent_authority = Tatarinov, [[1960 in paleontology|1960]]
| subdivision_ranks = Species
| authority = Tatarinov, 1960 }}
| subdivision =

* {{extinct}}'''''A. rossicus''''' <small>Tatarinov, 1960 ([[Type species|type]])</small>
'''''Archosaurus''''' (meaning "ruling lizard") is an extinct [[genus]] of carnivorous [[proterosuchidae|proterosuchid]] [[archosauriform]] [[reptile]].<ref>{{Cite journal | doi = 10.1134/S0031030106100078| title = Vyazniki biotic assemblage of the terminal Permian| journal = Paleontological Journal| volume = 40| issue = 4| pages = S475| year = 2006| last1 = Sennikov | first1 = A. G.| last2 = Golubev | first2 = V. K.| s2cid = 129507095}}</ref> Its fossils are dated to the [[Late Permian|latest Permian]] of [[Russia]] and [[Poland]], it is one of the earliest known archosauriforms. The type and only species is '''''Archosaurus rossicus''''', known from several fragmentary specimens which cumulatively represent parts of the skull and cervical vertebrae.<ref name=Paleont1960>Paleont. Zh. 1960 (4)</ref><ref>{{cite book |last=Sennikov |first=A.G. |author2=Gower, D.J. |year=2000 |chapter=Early archosaurs from Russia |title=The Age of Dinosaurs in Russia and Mongolia |editor=Benton, M.J. |editor2=Shishkin, M.A. |editor3=Unwin, D.M. |publisher=Cambridge University Press |location=Cambridge |isbn=978-0-521-54582-2}}</ref> It would have been {{convert|3|m|ft}} long when fully grown.<ref name=Tata60 />
}}

[[File:Archosaurus ross1DB.jpg|thumb|left|Restoration]]
When first described in 1960, ''Archosaurus'' was considered the oldest known [[archosaur]] and a close relative of ''[[Proterosuchus]]'' from the [[Early Triassic]].<ref name=Paleont1960 /><ref name=Tata60>Tatarinov, L. P. (1960). ''Otkrytie pseudozhukhii v verkhnei permi SSSR: Paleontologischeskii Zhurnal'', 1960, n. 4, p. 74-80.</ref> However, Archosauria in modern terms is considered a more restricted group which ''Archosaurus'' lies outside of. The "classic" definition of archosaur utilized prior to the widespread use of [[cladistics]] is now roughly equivalent to the clade Archosauriformes.<ref>Gauthier J. A. (1994): ''The diversification of the amniotes''. In: D. R. Prothero and R. M. Schoch (ed.) Major Features of Vertebrate Evolution: 129-159. Knoxville, Tennessee: The Paleontological Society.</ref> ''Archosaurus'' is still considered the oldest undisputed archosauriform, as well as one of the few valid members of the family [[Proterosuchidae]].<ref name="ezcurra2016">{{Cite journal|last=Ezcurra|first=Martín D.|date=2016-04-28|title=The phylogenetic relationships of basal archosauromorphs, with an emphasis on the systematics of proterosuchian archosauriforms|journal=PeerJ|language=en|volume=4|pages=e1778|doi=10.7717/peerj.1778|pmid=27162705|pmc=4860341|issn=2167-8359|doi-access=free}}</ref>
[[File:Archosaurus rossicus.png|upright|thumb|left|Holotype maxilla]]

'''''Archosaurus''''' is an extinct [[genus]] of carnivorous [[archosauriform]] [[reptile]].<ref> {{Cite doi|10.1134/S0031030106100078}}</ref> From the latest [[Permian]] of [[Russia]] and [[Poland]], it is one of the earliest known archosauriformes.
A 2023 study placed ''Archosaurus'' in the new subfamily [[Proterosuchidae|Chasmatosuchinae]] within the proterosuchids. This would make ''Archosaurus'' significantly derived despite being the oldest known archosauriform, indicating that significant diversification already occurred among proterosuchids during the Permian.<ref name=":0">{{Cite journal |last=Ezcurra |first=Martín D. |last2=Bandyopadhyay |first2=Saswati |last3=Sengupta |first3=Dhurjati P. |last4=Sen |first4=Kasturi |last5=Sennikov |first5=Andrey G. |last6=Sookias |first6=Roland B. |last7=Nesbitt |first7=Sterling J. |last8=Butler |first8=Richard J. |date=25 October 2023 |title=A new archosauriform species from the Panchet Formation of India and the diversification of Proterosuchidae after the end-Permian mass extinction |url=https://royalsocietypublishing.org/doi/10.1098/rsos.230387 |journal=Royal Society Open Science |language=en |volume=10 |issue=10 |doi=10.1098/rsos.230387 |issn=2054-5703 |pmc=10598453 |pmid=37885992}}</ref>

==Gallery==
<gallery>
File:Archosaurus rossicus.png|PIN 1100/55, the holotype left premaxilla
File:Archosaurus_ross1DB.jpg|Restoration
File:Archosaurus Scale.svg|Size comparison
[[File:Screenshot 2022-09-18 11.28.59 AM.png|thumb]]
</gallery>


==See also==
==See also==
*''[[Proterosuchus]]''
*''[[Proterosuchus]]''


== References ==
==References==
{{Reflist}}
<references/>

{{Archosauriformes|B.}}
{{Taxonbar|from=Q2636799}}


⚫
[[Category:Proterosuchids]]
[[Category:Prehistoric reptile genera]]
⚫
[[Category:Lopingian reptiles of Europe]]
[[Category:Fossils of Poland]]
[[Category:Permian Russia]]
[[Category:Fossil taxa described in 1960]]


⚫
[[Category:Archosaurs]]
⚫
[[Category:Permian reptiles]]


{{paleo-archosaur-stub}}
{{Permian-reptile-stub}}
{{Permian-reptile-stub}}

Latest revision as of 12:42, 21 April 2024

Archosaurus
Temporal range: Late Permian, 252 Ma
↓
Restored skull
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Clade: Archosauriformes
Family: †Proterosuchidae
Subfamily: †Chasmatosuchinae
Genus: †Archosaurus
Tatarinov, 1960
Species:
†A. rossicus
Binomial name
†Archosaurus rossicus
Tatarinov, 1960

Archosaurus (meaning "ruling lizard") is an extinct genus of carnivorous proterosuchid archosauriform reptile.[1] Its fossils are dated to the latest Permian of Russia and Poland, it is one of the earliest known archosauriforms. The type and only species is Archosaurus rossicus, known from several fragmentary specimens which cumulatively represent parts of the skull and cervical vertebrae.[2][3] It would have been 3 metres (9.8 ft) long when fully grown.[4]

When first described in 1960, Archosaurus was considered the oldest known archosaur and a close relative of Proterosuchus from the Early Triassic.[2][4] However, Archosauria in modern terms is considered a more restricted group which Archosaurus lies outside of. The "classic" definition of archosaur utilized prior to the widespread use of cladistics is now roughly equivalent to the clade Archosauriformes.[5] Archosaurus is still considered the oldest undisputed archosauriform, as well as one of the few valid members of the family Proterosuchidae.[6]

A 2023 study placed Archosaurus in the new subfamily Chasmatosuchinae within the proterosuchids. This would make Archosaurus significantly derived despite being the oldest known archosauriform, indicating that significant diversification already occurred among proterosuchids during the Permian.[7]

Gallery[edit]

  • PIN 1100/55, the holotype left premaxilla
    PIN 1100/55, the holotype left premaxilla
  • Restoration
    Restoration
  • Size comparison
    Size comparison

See also[edit]

References[edit]

  1. ^ Sennikov, A. G.; Golubev, V. K. (2006). "Vyazniki biotic assemblage of the terminal Permian". Paleontological Journal. 40 (4): S475. doi:10.1134/S0031030106100078. S2CID 129507095.
  2. ^ a b Paleont. Zh. 1960 (4)
  3. ^ Sennikov, A.G.; Gower, D.J. (2000). "Early archosaurs from Russia". In Benton, M.J.; Shishkin, M.A.; Unwin, D.M. (eds.). The Age of Dinosaurs in Russia and Mongolia. Cambridge: Cambridge University Press. ISBN 978-0-521-54582-2.
  4. ^ a b Tatarinov, L. P. (1960). Otkrytie pseudozhukhii v verkhnei permi SSSR: Paleontologischeskii Zhurnal, 1960, n. 4, p. 74-80.
  5. ^ Gauthier J. A. (1994): The diversification of the amniotes. In: D. R. Prothero and R. M. Schoch (ed.) Major Features of Vertebrate Evolution: 129-159. Knoxville, Tennessee: The Paleontological Society.
  6. ^ 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.
  7. ^ Ezcurra, Martín D.; Bandyopadhyay, Saswati; Sengupta, Dhurjati P.; Sen, Kasturi; Sennikov, Andrey G.; Sookias, Roland B.; Nesbitt, Sterling J.; Butler, Richard J. (25 October 2023). "A new archosauriform species from the Panchet Formation of India and the diversification of Proterosuchidae after the end-Permian mass extinction". Royal Society Open Science. 10 (10). doi:10.1098/rsos.230387. ISSN 2054-5703. PMC 10598453. PMID 37885992.


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