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{{short description|Extinct genus of therapsid reptile
{{short description|Extinct genus of therapsid reptile}}
{{More citations needed|date=February 2022}}
{{More citations needed|date=February 2022}}
{{italic title}}
{{italic title}}
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| image_caption =
| image_caption =
| regnum = [[Animal]]ia
| regnum = [[Animal]]ia
| phylum = [[Chordate
| phylum = [[Chordata]]
⚫
| subclassis = [[Synapsid]]a
class reptilia
⚫
| subclass = [[Synapsid]]a
| ordo = [[Therapsida]]
| ordo = [[Therapsida]]
| subordo = {{extinct}}[[Biarmosuchia]]
| subordo = {{extinct}}[[Biarmosuchia]]
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| type_species_authority = Tchudinov, 1983
| type_species_authority = Tchudinov, 1983
}}
}}

'''''Ivantosaurus''''' is an [[extinct]] [[genus]] of [[therapsid]] that lived in [[Russia]] during the [[Wordian]] stage of the [[Permian]] period, named in honor of [[Ivan Antonovich Efremov]] (the great Soviet [[science fiction|paleontologist]]). {{Citation needed|date=August 2019}}
'''''Ivantosaurus''''' is an [[extinct]] [[genus]] of [[therapsid]] that lived in [[Russia]] during the [[Wordian]] stage of the [[Permian]] period, named in honor of paleontologist [[Ivan Antonovich Efremov]].<ref name=":0"/>


==Description==
==Description==
[[File:Ivantosaurus.jpg|left|thumb|[[Paleoart|Life restoration]]]]
''Ivantosaurus'' is based on a very fragmentary skull, consisting of 2 partial maxillae and a quadrate.<ref name=":0">{{Cite journal|last=Tchudinov|first=P. K.|date=1983|title=Early Therapsids|url=http://ocher.biblioteka-perm.ru/upload/pages/42199/dat_1507888790536.pdf|journal=Proceedings of the Paleontological Institute|volume=202|pages=68–70}}</ref> The specimen was discovered in the Perm Region of the Ochersky District, Russia. Fossils from the region date to the Upper Kazanian Substage of the Upper Permian, making it one of the latest Therapsids known. It was carnivorous and may have grown to a length of 6 meters, approx. Ivantosaurus would have been the largest carnivorous [[therapsid]] known, exceeding in size even the largest Late Wordian/early Capitanian [[anteosaur]]s.<ref name=":0">{{Cite journal|last=Tchudinov|first=P. K.|date=1983|title=Early Therapsids|url=http://ocher.biblioteka-perm.ru/upload/pages/42199/dat_1507888790536.pdf|journal=Proceedings of the Paleontological Institute|volume=202|pages=68–70}}</ref>
''Ivantosaurus'' is based on a very fragmentary skull, consisting of 2 partial maxillae and a quadrate.<ref name=":0">{{Cite journal|last=Tchudinov|first=P. K.|date=1983|title=Early Therapsids|url=http://ocher.biblioteka-perm.ru/upload/pages/42199/dat_1507888790536.pdf#page=68|journal=Proceedings of the Paleontological Institute|volume=202|pages=66-70|lang=ru|archive-url=https://web.archive.org/web/20210815111704/http://ocher.biblioteka-perm.ru/upload/pages/42199/dat_1507888790536.pdf#page=68|archive-date=August 15, 2021|url-status=live}}</ref> The specimen was discovered in the Perm Region of the Ochersky District, Russia. Fossils from the region date to the Upper Kazanian Substage of the Upper Permian, making it one of the latest Therapsids known. It was carnivorous and may have grown to a length of {{cvt|6|m}}.<ref name=Eotitanosuchidae>{{cite web|title=Eotitanosuchidae |url=http://www.kheper.net/evolution/therapsida/Eotitanosuchidae.html|website=Kheper|publisher=M.Alan Kazlev |archive-url=https://web.archive.org/web/20190806075958/http://www.kheper.net/evolution/therapsida/Eotitanosuchidae.html |archive-date=6 August 2019 |access-date=9 September 2022}}</ref> ''Ivantosaurus'' would have been the largest carnivorous [[therapsid]] known, exceeding in size even the largest Late Wordian/early Capitanian [[anteosaur]]s.<ref name=":0"/>


===Teeth===
===Teeth===
Two canine teeth are set side-to-side in ''Ivantosaurus''' jaw and with their axes inclined forward. It is possible that this therapsid had a unique dentition (no other known animal has two sets of canine teeth), but more likely that a replacement tooth was growing in next to the old tooth about to be lost. Sigogneau-Russell (1989) seems to think this is unlikely, which would make this a quite different animal from ''[[Eotitanosuchus]]''. As with the [[therocephalian]] family [[Lycosuchidae]], these may simply be replacement canines. There are few known animals, living or extinct, with two sets of canines (it would be a very inefficient chewing mechanism).{{Citation needed|date=August 2019}}
Two canine teeth are set side-to-side in ''Ivantosaurus''' jaw and with their axes inclined forward. It is possible that this therapsid had a unique dentition (no other known animal has two sets of canine teeth), but more likely that a replacement tooth was growing in next to the old tooth about to be lost. Sigogneau-Russell (1989) seems to think this is unlikely, which would make this a quite different animal from ''[[Eotitanosuchus]]''. As with the [[therocephalian]] family [[Lycosuchidae]], these may simply be replacement canines. There are few known animals, living or extinct, with two sets of canines (it would be a very inefficient chewing mechanism).<ref name=Eotitanosuchidae/>


==See also==
==See also==
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== External links ==
== External links ==
* [http://www.kheper.net/evolution/therapsida/Eotitanosuchidae.html Eotitanosuchidae] at Kheper
* [http://www.kheper.net/evolution/therapsida/Eotitanosuchidae.html Eotitanosuchidae] {{Webarchive|url=https://web.archive.org/web/20070520010121/http://www.kheper.net/evolution/therapsida/Eotitanosuchidae.html |date=2007-05-20 }} at Kheper
* [http://palaeos.com/vertebrates/therapsida/biarmosuchidae.html#Biarmosuchia Therapsida: Biarmosuchia: Biarmosuchidae / Eotitanosuchidae] at Palaeos
* [http://palaeos.com/vertebrates/therapsida/biarmosuchidae.html#Biarmosuchia Therapsida: Biarmosuchia: Biarmosuchidae / Eotitanosuchidae] at Palaeos


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[[Category:Biarmosuchians]]
[[Category:Biarmosuchians]]
[[Category:Prehistoric therapsid genera]]
[[Category:Prehistoric therapsid genera]]
[[Category:Guadalupian synapsids of Europe]
[[Category:Guadalupian synapsids of Europe]]
ivantosaurus is a carnivorous reptile witch at live
In permian period it had a skull
Like mammals its about size of grizzly bears lions and tigers
First Allosaurus came alone ivantosaurus can kill 100 animals
This animal teeth like leopards
It lived in Russia
Most of mammals ivantosaurus had a diet meat
Until Allosaurus arrives
Like synapsids its close to mammals like lions

Latest revision as of 12:48, 22 February 2024

Ivantosaurus
Temporal range: Wordian, 267 Ma
↓
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Subclass:
Synapsida
Order:
Therapsida
Suborder:
†Biarmosuchia
Family:
†Eotitanosuchidae
Genus:
†Ivantosaurus

Tchudinov, 1983
Type species
†Ivantosaurus ensifer
Tchudinov, 1983

Ivantosaurus is an extinct genus of therapsid that lived in Russia during the Wordian stage of the Permian period, named in honor of paleontologist Ivan Antonovich Efremov.[1]

Description[edit]

Life restoration

Ivantosaurus is based on a very fragmentary skull, consisting of 2 partial maxillae and a quadrate.[1] The specimen was discovered in the Perm Region of the Ochersky District, Russia. Fossils from the region date to the Upper Kazanian Substage of the Upper Permian, making it one of the latest Therapsids known. It was carnivorous and may have grown to a length of 6 m (20 ft).[2] Ivantosaurus would have been the largest carnivorous therapsid known, exceeding in size even the largest Late Wordian/early Capitanian anteosaurs.[1]

Teeth[edit]

Two canine teeth are set side-to-side in Ivantosaurus' jaw and with their axes inclined forward. It is possible that this therapsid had a unique dentition (no other known animal has two sets of canine teeth), but more likely that a replacement tooth was growing in next to the old tooth about to be lost. Sigogneau-Russell (1989) seems to think this is unlikely, which would make this a quite different animal from Eotitanosuchus. As with the therocephalian family Lycosuchidae, these may simply be replacement canines. There are few known animals, living or extinct, with two sets of canines (it would be a very inefficient chewing mechanism).[2]

See also[edit]

References[edit]

  1. ^ a b c Tchudinov, P. K. (1983). "Early Therapsids" (PDF). Proceedings of the Paleontological Institute (in Russian). 202: 66–70. Archived (PDF) from the original on August 15, 2021.
  2. ^ a b "Eotitanosuchidae". Kheper. M.Alan Kazlev. Archived from the original on 6 August 2019. Retrieved 9 September 2022.

Sources[edit]

  • The Age of Dinosaurs in Russia and Mongolia. Benton, Michael J.; Shishkin, Mikhail A.; Unwin, David M. 2003. pp. 91–92.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Ivantosaurus&oldid=1209549924"