Rhomaleopakhus: Difference between revisions
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{{Speciesbox |
{{Speciesbox |
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| fossil_range = [[Late Jurassic]] {{Fossil range|145}} |
| fossil_range = [[Late Jurassic]] {{Fossil range|145}} |
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| image = |
| image = Rhomaleopakhus skeletal.png |
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| image_caption = |
| image_caption = Skeletal diagram of the holotype |
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| genus = Rhomaleopakhus |
| genus = Rhomaleopakhus |
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| parent_authority = [[Paul Upchurch|Upchurch]] ''et al.'', [[2021 in archosaur paleontology|2021]] |
| parent_authority = [[Paul Upchurch|Upchurch]] ''et al.'', [[2021 in archosaur paleontology|2021]] |
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'''''Rhomaleopakhus''''' (meaning "strong forearm") is a [[genus]] of [[Mamenchisauridae|mamenchisaurid]] |
'''''Rhomaleopakhus''''' (meaning "strong forearm") is a [[genus]] of [[Mamenchisauridae|mamenchisaurid]] |
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sauropod, dinosaur from the Late Jurassic [[Kalaza Formation]] of [[China]]. The type and only species is '''''Rhomaleopakhus turpanensis'''''.<ref name="Rhomaleopakhus">{{cite journal| vauthors = Upchurch P, Mannion PD, Xu X, Barrett PM | title = Re-assessment of the Late Jurassic eusauropod dinosaur ''Hudiesaurus sinojapanorum'' Dong, 1997, from the Turpan Basin, China, and the evolution of hyper-robust antebrachia in sauropods |year=2021 |journal=Journal of Vertebrate Paleontology | volume = 41 | issue = 4 |pages=e1994414 |doi=10.1080/02724634.2021.1994414 | s2cid = 245164168 }}</ref> |
sauropod, dinosaur from the Late Jurassic [[Kalaza Formation]] of [[China]]. The type and only species is '''''Rhomaleopakhus turpanensis'''''.<ref name="Rhomaleopakhus">{{cite journal| vauthors = Upchurch P, Mannion PD, Xu X, Barrett PM | title = Re-assessment of the Late Jurassic eusauropod dinosaur ''Hudiesaurus sinojapanorum'' Dong, 1997, from the Turpan Basin, China, and the evolution of hyper-robust antebrachia in sauropods |year=2021 |journal=Journal of Vertebrate Paleontology | volume = 41 | issue = 4 |pages=e1994414 |doi=10.1080/02724634.2021.1994414 | s2cid = 245164168 | doi-access = free }}</ref> |
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== History == |
== History == |
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== Description == |
== Description == |
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Upchurch ''et al.'' note that the robustness of the forelimb, after which the taxon was named, [[Convergent evolution|convergently evolved]] in what are called the "Core ''[[Mamenchisaurus]]''-like taxa" (CMTs)<ref name="moore2020">{{cite journal |last1=Moore |first1=A.J. |last2=Upchurch |first2=P. |last3=Barrett |first3=P.M. |last4=Clark |first4=J.M. |last5=Xing |first5=X. |year=2020 |title=Osteology of ''Klamelisaurus gobiensis'' (Dinosauria, Eusauropoda) and the evolutionary history of Middle–Late Jurassic Chinese sauropods |journal=Journal of Systematic Palaeontology |volume=18 |issue=16 |pages=1299–1393 |doi=10.1080/14772019.2020.1759706 |s2cid=219749618|url=https://discovery.ucl.ac.uk/id/eprint/10101710/ }}</ref> [[titanosaurs]], and [[ceratopsids]]. They believe this correlates with a more flexed orientation of the forearm, an enhanced role of the forearm in feeding, and a more anterior shift in the center of mass. It is possible that CMTs and titanosaurs specialized in a feeding strategy that involved efficient locomotion between sparsely-located food sources.<ref name=Rhomaleopakhus /> |
Upchurch ''et al.'' note that the robustness of the forelimb, after which the taxon was named, [[Convergent evolution|convergently evolved]] in what are called the "Core ''[[Mamenchisaurus]]''-like taxa" (CMTs),<ref name="moore2020">{{cite journal |last1=Moore |first1=A.J. |last2=Upchurch |first2=P. |last3=Barrett |first3=P.M. |last4=Clark |first4=J.M. |last5=Xing |first5=X. |year=2020 |title=Osteology of ''Klamelisaurus gobiensis'' (Dinosauria, Eusauropoda) and the evolutionary history of Middle–Late Jurassic Chinese sauropods |journal=Journal of Systematic Palaeontology |volume=18 |issue=16 |pages=1299–1393 |doi=10.1080/14772019.2020.1759706 |s2cid=219749618|url=https://discovery.ucl.ac.uk/id/eprint/10101710/ }}</ref> [[titanosaurs]], and [[ceratopsids]]. They believe this correlates with a more flexed orientation of the forearm, an enhanced role of the forearm in feeding, and a more anterior shift in the center of mass. It is possible that CMTs and titanosaurs specialized in a feeding strategy that involved efficient locomotion between sparsely-located food sources.<ref name=Rhomaleopakhus /> |
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== Classification == |
== Classification == |
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[[Category:Late Jurassic dinosaurs of Asia]] |
[[Category:Late Jurassic dinosaurs of Asia]] |
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[[Category:Fossil taxa described in 2021]] |
[[Category:Fossil taxa described in 2021]] |
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[[Category:Monotypic sauropod genera]] |
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Latest revision as of 19:54, 16 December 2024
| Rhomaleopakhus Temporal range: Late Jurassic
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| Skeletal diagram of the holotype | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Family: | †Mamenchisauridae |
| Genus: | †Rhomaleopakhus Upchurch et al., 2021 |
| Species: | †R. turpanensis
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| Binomial name | |
| †Rhomaleopakhus turpanensis Upchurch et al., 2021
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Rhomaleopakhus (meaning "strong forearm") is a genus of mamenchisaurid sauropod, dinosaur from the Late Jurassic Kalaza Formation of China. The type and only species is Rhomaleopakhus turpanensis.[1]
History
[edit]The holotype IVPP-V11121-1, was found by a Chinese-Japanese Chunichi Shinibun expedition near Qiketai in Shanshan, Xinjiang province in 1993, along with the holotype of Hudiesaurus,[2] and is a partially complete forelimb consisting of a humerus, ulna, radius, one carpal, and a partially complete manus that was originally assigned to the coeval mamenchisaurid Hudiesaurus.[2] Paul Upchurch in 2004 rejected the identity because of a lack of overlapping material.[3] However, in a 2021 reassessment of the latter genus, the forelimb was separated from its hypodigm and named the holotype of a new genus and species, Rhomaleopakhus turpanensis; the specific name refers to the Turpan Basin where the specimen was collected.[1]
Description
[edit]Upchurch et al. note that the robustness of the forelimb, after which the taxon was named, convergently evolved in what are called the "Core Mamenchisaurus-like taxa" (CMTs),[4] titanosaurs, and ceratopsids. They believe this correlates with a more flexed orientation of the forearm, an enhanced role of the forearm in feeding, and a more anterior shift in the center of mass. It is possible that CMTs and titanosaurs specialized in a feeding strategy that involved efficient locomotion between sparsely-located food sources.[1]
Classification
[edit]Upchurch et al. used Moore et al. (2020)'s[4] phylogenetic analysis to determine the relationships of Rhomaleopakhus. They found it to be a mamenchisaurid sister to Chuanjiesaurus, in a clade that also includes Analong. Their cladogram is shown below:[1]
| Mamenchisauridae |
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References
[edit]- ^ a b c d Upchurch P, Mannion PD, Xu X, Barrett PM (2021). "Re-assessment of the Late Jurassic eusauropod dinosaur Hudiesaurus sinojapanorum Dong, 1997, from the Turpan Basin, China, and the evolution of hyper-robust antebrachia in sauropods". Journal of Vertebrate Paleontology. 41 (4): e1994414. doi:10.1080/02724634.2021.1994414. S2CID 245164168.
- ^ a b Dong, Z. (1997). "A gigantic sauropod (Hudiesaurus sinojapanorum gen. et sp. nov.) from the Turpan Basin, China." Pp. 102-110 in Dong, Z. (ed.), Sino-Japanese Silk Road Dinosaur Expedition. China Ocean Press, Beijing.
- ^ Upchurch, P.; Barrett, P.M.; Dodson, P.; 2004 "Sauropoda". In: Weishampel, D.B. and Dodson, P. and Osmolska, H., (eds.) The Dinosauria. p 259 - 322. University of California Press: Berkeley and Los Angeles
- ^ a b Moore, A.J.; Upchurch, P.; Barrett, P.M.; Clark, J.M.; Xing, X. (2020). "Osteology of Klamelisaurus gobiensis (Dinosauria, Eusauropoda) and the evolutionary history of Middle–Late Jurassic Chinese sauropods". Journal of Systematic Palaeontology. 18 (16): 1299–1393. doi:10.1080/14772019.2020.1759706. S2CID 219749618.
