Ojoraptorsaurus: Difference between revisions
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'''''Ojoraptorsaurus''''' is a [[genus]] of [[oviraptorosaurian]] [[dinosaur]] from the [[late Cretaceous]]. ''Ojoraptorsaurus'' is only known from pubic bones found at the [[Naashoibito Member]] of the [[Ojo Alamo Formation]] dating to the early [[Maastrichtian]], about 69 million years ago. It was first named by Robert M. Sullivan, Steven E. Jasinski and Mark P.A. van Tomme in [[2011 in paleontology|2011]] and the [[type species]] is ''Ojoraptorsaurus boerei''. The generic name combines a reference to the formation with a [[Latin]] ''raptor'', "plunderer", and a Latinised Greek ''saurus'', "lizard". The [[specific name (zoology)|specific name]] honours [[oceanographer]] [[Arjan Boeré]] who found the specimen.<ref name=caenagnathids>{{cite journal |author=Robert M. Sullivan, Steven E. Jasinski and Mark P.A. Van Tomme |year=2011 |title=A new caenagnathid ''Ojoraptorsaurus boerei'', n. gen., n. sp. (Dinosauria, Oviraptorosauria), from the Upper Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico |url= |
'''''Ojoraptorsaurus''''' is a [[genus]] of [[oviraptorosaurian]] [[dinosaur]] from the [[late Cretaceous]]. ''Ojoraptorsaurus'' is only known from pubic bones found at the [[Naashoibito Member]] of the [[Ojo Alamo Formation]] dating to the early [[Maastrichtian]], about 69 million years ago. It was first named by Robert M. Sullivan, Steven E. Jasinski and Mark P.A. van Tomme in [[2011 in paleontology|2011]] and the [[type species]] is ''Ojoraptorsaurus boerei''. The generic name combines a reference to the formation with a [[Latin]] ''raptor'', "plunderer", and a Latinised Greek ''saurus'', "lizard". The [[specific name (zoology)|specific name]] honours [[oceanographer]] [[Arjan Boeré]] who found the specimen.<ref name=caenagnathids>{{cite journal |author=Robert M. Sullivan, Steven E. Jasinski and Mark P.A. Van Tomme |year=2011 |title=A new caenagnathid ''Ojoraptorsaurus boerei'', n. gen., n. sp. (Dinosauria, Oviraptorosauria), from the Upper Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico |url=https://www.researchgate.net/publication/281350934_A_new_caenagnathid_Ojoraptorsaurus_boerei_n_gen_n_sp_Dinosauria_Oviraptorosauria_from_the_Upper_Ojo_Alamo_Formation_Naashoibito_Member_San_Juan_Basin_New_Mexico |journal=Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin |volume=53 |pages=418–428}}</ref> |
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== Description == |
== Description == |
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The [[holotype]] of ''Ojoraptorsaurus'' is [[State Museum of Pennsylvania|SMP]] VP-1458, an incomplete pair of fused [[Pubis (bone)|pubes]]. Due to the fusion of the pubes, this specimen is believed to have been a mature individual. Most [[Caenagnathidae|caenagnathid]] species are known from very few remains, and ''Ojoraptorsaurus'' is no exception. The holotype was compared to well-described pubic remains of other oviraptorosaurians, namely ''[[Microvenator]]'', ''[[Epichirostenotes]]'', ''[[Nomingia]]'', and CM 78001 (now known as ''[[Anzu (dinosaur)|Anzu]]'').<ref name="caenagnathids" /> It shares with the latter three taxa an enclosed [[Fossa (anatomy)|fossa]] on the inside edge of the pubis near the [[Acetabulum|acetabular]] rim, a trait which may be diagnostic to caenagnathids (in which case ''Nomingia'' is a caenagnathid). ''Ojoraptorsaurus's'' fossa is further away from the acetabular rim than those of the other species, a feature characteristic to the genus. Among compared oviraptorosaurians, ''Ojoraptorsaurus'' is most similar to ''Epichirostenotes'', a genus differentiated from ''[[Chirostenotes]]'' in the same paper that ''Ojoraptorsarus'' was described in. By comparing pubic proportions with those of CM 78001 (''Anzu''), ''Ojoraptorsaurus'' has been estimated to have been about 1.8 to 2.1 meters (5.9 to 6.9 feet) in length, about 20% smaller than ''Epichirostenotes''.<ref name="caenagnathids" /> |
The [[holotype]] of ''Ojoraptorsaurus'' is [[State Museum of Pennsylvania|SMP]] VP-1458, an incomplete pair of fused [[Pubis (bone)|pubes]]. Due to the fusion of the pubes, this specimen is believed to have been a mature individual. Most [[Caenagnathidae|caenagnathid]] species are known from very few remains, and ''Ojoraptorsaurus'' is no exception. The holotype was compared to well-described pubic remains of other oviraptorosaurians, namely ''[[Microvenator]]'', ''[[Epichirostenotes]]'', ''[[Nomingia]]'', and CM 78001 (now known as ''[[Anzu (dinosaur)|Anzu]]'').<ref name="caenagnathids" /> It shares with the latter three taxa an enclosed [[Fossa (anatomy)|fossa]] on the inside edge of the pubis near the [[Acetabulum|acetabular]] rim, a trait which may be diagnostic to caenagnathids (in which case ''Nomingia'' is a caenagnathid). ''Ojoraptorsaurus's'' fossa is further away from the acetabular rim than those of the other species, a feature characteristic to the genus. Among compared oviraptorosaurians, ''Ojoraptorsaurus'' is most similar to ''Epichirostenotes'', a genus differentiated from ''[[Chirostenotes]]'' in the same paper that ''Ojoraptorsarus'' was described in. By comparing pubic proportions with those of CM 78001 (''Anzu''), ''Ojoraptorsaurus'' has been estimated to have been about 1.8 to 2.1 meters (5.9 to 6.9 feet) in length, about 20% smaller than ''Epichirostenotes''.<ref name="caenagnathids" /> |
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''Ojoraptorsaurus'' |
In its 2011 [[Species description|description]], ''Ojoraptorsaurus'' was suggested to differ from other caenagnathids due to possessing the following [[Autapomorphy|autapomorphies]]:<ref name="caenagnathids" /> |
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* A “spoon-shaped” depression on the anterior dorsal surface of the pubic boot. |
* A “spoon-shaped” depression on the anterior dorsal surface of the pubic boot. |
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* An enclosed fossa on the inside edge of the pubis which lies 1 centimeter away from the acetabular rim. |
* An enclosed fossa on the inside edge of the pubis which lies 1 centimeter away from the acetabular rim. |
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* The portion of the pubic shaft directly above the pubic boot being slightly anteriorly convex. |
* The portion of the pubic shaft directly above the pubic boot being slightly anteriorly convex. |
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* A sub-trapezoidal iliac peduncle articular surface of the pubis. |
* A sub-trapezoidal iliac peduncle articular surface of the pubis. |
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In 2024, Funston, Williamson & [[Stephen L. Brusatte|Brusatte]] suggested that, even though ''Ojoraptorsaurus'' could be seen as distinct due to its unique stratigraphic position and provenance, it should be considered a ''[[nomen dubium]]'' since none of the supposed unique features are actually diagnostic for caenagnathids, and some may result from [[Taphonomy|taphonomic distortion]].<ref name="Funston2024">{{Cite journal |last1=Funston |first1=G. F. |last2=Williamson |first2=T. E. |last3=Brusatte |first3=S. L. |year=2024 |title=A caenagnathid tibia (Theropoda: Oviraptorosauria) from the upper Campanian Kirtland Formation of New Mexico |journal=[[Cretaceous Research]] |at=105856 |issue=in press |doi=10.1016/j.cretres.2024.105856 }}</ref> |
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==See also== |
==See also== |
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{{Reflist}} |
{{Reflist}} |
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{{Oviraptorosauria}} |
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{{Maniraptora|O.}} |
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{{Taxonbar|from=Q1704992}} |
{{Taxonbar|from=Q1704992}} |
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[[Category:Maastrichtian genus first appearances]] |
[[Category:Maastrichtian genus first appearances]] |
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[[Category:Maastrichtian genus extinctions]] |
[[Category:Maastrichtian genus extinctions]] |
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[[Category:Monotypic dinosaur genera]] |
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Latest revision as of 10:16, 22 April 2024
| Ojoraptorsaurus Temporal range: Late Cretaceous,
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|---|---|
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| Silhouette showing the pubis bones | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Superfamily: | †Caenagnathoidea |
| Family: | †Caenagnathidae |
| Genus: | †Ojoraptorsaurus Sullivan et al., 2011 |
| Species: | †O. boerei
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| Binomial name | |
| †Ojoraptorsaurus boerei Sullivan et al., 2011
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Ojoraptorsaurus is a genus of oviraptorosaurian dinosaur from the late Cretaceous. Ojoraptorsaurus is only known from pubic bones found at the Naashoibito Member of the Ojo Alamo Formation dating to the early Maastrichtian, about 69 million years ago. It was first named by Robert M. Sullivan, Steven E. Jasinski and Mark P.A. van Tomme in 2011 and the type species is Ojoraptorsaurus boerei. The generic name combines a reference to the formation with a Latin raptor, "plunderer", and a Latinised Greek saurus, "lizard". The specific name honours oceanographer Arjan Boeré who found the specimen.[1]
Description[edit]
The holotype of Ojoraptorsaurus is SMP VP-1458, an incomplete pair of fused pubes. Due to the fusion of the pubes, this specimen is believed to have been a mature individual. Most caenagnathid species are known from very few remains, and Ojoraptorsaurus is no exception. The holotype was compared to well-described pubic remains of other oviraptorosaurians, namely Microvenator, Epichirostenotes, Nomingia, and CM 78001 (now known as Anzu).[1] It shares with the latter three taxa an enclosed fossa on the inside edge of the pubis near the acetabular rim, a trait which may be diagnostic to caenagnathids (in which case Nomingia is a caenagnathid). Ojoraptorsaurus's fossa is further away from the acetabular rim than those of the other species, a feature characteristic to the genus. Among compared oviraptorosaurians, Ojoraptorsaurus is most similar to Epichirostenotes, a genus differentiated from Chirostenotes in the same paper that Ojoraptorsarus was described in. By comparing pubic proportions with those of CM 78001 (Anzu), Ojoraptorsaurus has been estimated to have been about 1.8 to 2.1 meters (5.9 to 6.9 feet) in length, about 20% smaller than Epichirostenotes.[1]
In its 2011 description, Ojoraptorsaurus was suggested to differ from other caenagnathids due to possessing the following autapomorphies:[1]
- A “spoon-shaped” depression on the anterior dorsal surface of the pubic boot.
- An enclosed fossa on the inside edge of the pubis which lies 1 centimeter away from the acetabular rim.
- The portion of the pubic shaft directly above the pubic boot being slightly anteriorly convex.
- A sub-trapezoidal iliac peduncle articular surface of the pubis.
In 2024, Funston, Williamson & Brusatte suggested that, even though Ojoraptorsaurus could be seen as distinct due to its unique stratigraphic position and provenance, it should be considered a nomen dubium since none of the supposed unique features are actually diagnostic for caenagnathids, and some may result from taphonomic distortion.[2]
See also[edit]
References[edit]
- ^ a b c d Robert M. Sullivan, Steven E. Jasinski and Mark P.A. Van Tomme (2011). "A new caenagnathid Ojoraptorsaurus boerei, n. gen., n. sp. (Dinosauria, Oviraptorosauria), from the Upper Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico". Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin. 53: 418–428.
- ^ Funston, G. F.; Williamson, T. E.; Brusatte, S. L. (2024). "A caenagnathid tibia (Theropoda: Oviraptorosauria) from the upper Campanian Kirtland Formation of New Mexico". Cretaceous Research (in press). 105856. doi:10.1016/j.cretres.2024.105856.
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