Qijianglong: Difference between revisions
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Since Suining Formation is dated to 114 mya by Wang et al. 2019, Qijianglong is a Cretaceous sauropod |
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{{short description|Genus of reptiles (fossil)}} |
{{short description|Genus of reptiles (fossil)}} |
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{{Automatic taxobox |
{{Automatic taxobox |
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| fossil_range = |
| fossil_range = Early Cretaceous, 115 Ma |
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| taxon = Qijianglong |
| taxon = Qijianglong |
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| authority = Xing ''et al.'', 2015 |
| authority = Xing ''et al.'', 2015 |
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'''''Qijianglong''''' is a [[Monotypic taxon|monospecific]] genus of herbivorous [[mamenchisaurid]] [[sauropod]] [[dinosaur]] |
'''''Qijianglong''''' is a [[Monotypic taxon|monospecific]] genus of herbivorous [[mamenchisaurid]] [[sauropod]] [[dinosaur]] from the [[Early Cretaceous]] of [[China]].<ref name=Xing_Quijianglong>{{cite_journal |doi=10.1080/02724634.2014.889701 |last=Xing| first= L |author2=Miyashita, T |author3=Zhang, J |author4=Li, Daqing |author5=Ye, Y |author6=Sekiya, T. |author7=Wang F |author8=Currie, P |title='A new sauropod dinosaur from the Late Jurassic of China and the diversity, distribution, and relationships of mamenchisaurids' | url = http://www.xinglida.net/pdf/Xing_et_al_2015_Qijianglong.pdf |journal=Journal of Vertebrate Paleontology| date = 26 Jan 2015 }}</ref> |
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==Discovery== |
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A [[vertebra]] of ''Qijianglong'' was first discovered in the early 1990s by farmer Cai Changming of Heba village, [[Sechuan]], in his backyard. Work at a nearby construction site at [[Qijiang District]] uncovered a rich fossil quarry in 2006. Its excavation caused an examination of the earlier find which led to the discovery of a skeleton. In 2015, the [[type species]] ''Qijianglong guokr'' was named and described by [[Xing Lida]] ([[China University of Geosciences (Wuhan)|China University of Geosciences]]), [[Tetsuto Miyashita]] ([[University of Alberta]]), [[Zhang Jianping]], [[Li Daqing]], [[Ye Yong]] ([[Zigong Dinosaur Museum]]), [[Toru Sekiya]] ([[Fukui Prefectural Dinosaur Museum]]), [[Wang Fengping]] and [[Philip John Currie]]. The generic name combines the district [[Qijiang District|Qijiang]] with [[Mandarin Chinese|Mandarin]] ''long'', "dragon". The [[specific name (zoology)|specific name]] ''guokr'', "nutshell", is that of a Chinese scientific [[social network]].<ref name=Xing_Quijianglong/> |
A [[vertebra]] of ''Qijianglong'' was first discovered in the early 1990s by farmer Cai Changming of Heba village, [[Sechuan]], in his backyard. Work at a nearby construction site at [[Qijiang District]] uncovered a rich fossil quarry in 2006. Its excavation caused an examination of the earlier find which led to the discovery of a skeleton. In 2015, the [[type species]] ''Qijianglong guokr'' was named and described by [[Xing Lida]] ([[China University of Geosciences (Wuhan)|China University of Geosciences]]), [[Tetsuto Miyashita]] ([[University of Alberta]]), [[Zhang Jianping]], [[Li Daqing]], [[Ye Yong]] ([[Zigong Dinosaur Museum]]), [[Toru Sekiya]] ([[Fukui Prefectural Dinosaur Museum]]), [[Wang Fengping]] and [[Philip John Currie]]. The generic name combines the district [[Qijiang District|Qijiang]] with [[Mandarin Chinese|Mandarin]] ''long'', "dragon". The [[specific name (zoology)|specific name]] ''guokr'', "nutshell", is that of a Chinese scientific [[social network]].<ref name=Xing_Quijianglong/> |
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The [[holotype]] '''QJGPM 1001''' was found in a layer of the [[Suining Formation]] which |
The [[holotype]] '''QJGPM 1001''' was found in a layer of the [[Suining Formation]], which was seen as dating from the Late Jurassic but is now considered mid-Cretaceous (late Aptian) based on radiometric dating.<ref>Wang, J.; Norell, M. A.; Pei, R.; Ye, Y.; Chang, S.-C (2019). Surprisingly young age for the mamenchisaurid sauropods in South China. ''Cretaceous Research'' doi:10.1016/j.cretres.2019.07.006.</ref> It consists of a partial skeleton with skull. It includes the rear of the skull, a partial right lower jaw, a complete series of seventeen neck vertebrae, the first six back vertebrae, ribs, the probable tenth tail vertebra, a series of twenty-eight rear tail vertebrae, chevrons, the left pubic bone and two upper pedal phalanges. It likely represents a juvenile individual, large but immature.<ref name=Xing_Quijianglong/> |
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The holotype of ''Qijianglong'' was about fifteen meters long and had a long neck. The describing authors established several distinguishing traits among which four [[autapomorphies]]. On the lower braincase the ''processus basipterygoideus'' has the form of a plate, is oriented along the body axis, and has an additional boss parallel to the ''tubera basilaria''. The neck vertebrae have rear joint processes, [[postzygapophysis|postzygapophyses]] that next to their normal facets show on the outside an additional finger-shaped extension, stiffening the neck in the horizontal plane but allowing vertical movement. The rear neck vertebrae have pneumatopores, pneumatic openings, in the depression between the [[diapophysis]], the upper rib joint process, and the neural spine. The [[pubic bone]] has a concave front edge, curving so strongly that its lower end is more directed to the front than to below.<ref name=Xing_Quijianglong/> |
The holotype of ''Qijianglong'' was about fifteen meters long and had a long neck. The describing authors established several distinguishing traits among which four [[autapomorphies]]. On the lower braincase the ''processus basipterygoideus'' has the form of a plate, is oriented along the body axis, and has an additional boss parallel to the ''tubera basilaria''. The neck vertebrae have rear joint processes, [[postzygapophysis|postzygapophyses]] that next to their normal facets show on the outside an additional finger-shaped extension, stiffening the neck in the horizontal plane but allowing vertical movement. The rear neck vertebrae have pneumatopores, pneumatic openings, in the depression between the [[diapophysis]], the upper rib joint process, and the neural spine. The [[pubic bone]] has a concave front edge, curving so strongly that its lower end is more directed to the front than to below.<ref name=Xing_Quijianglong/> |
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==Systematics== |
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''Qijianglong'' was placed in the [[family (biology)|family]] [[Mamenchisauridae]], in a relatively basal position but above ''[[Omeisaurus]] tianfuensis'' in the evolutionary tree.<ref name=Xing_Quijianglong/> |
''Qijianglong'' was placed in the [[family (biology)|family]] [[Mamenchisauridae]], in a relatively basal position but above ''[[Omeisaurus]] tianfuensis'' in the evolutionary tree.<ref name=Xing_Quijianglong/> |
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[[Category:Mamenchisaurids]] |
[[Category:Mamenchisaurids]] |
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[[Category:Fossil taxa described in 2015]] |
[[Category:Fossil taxa described in 2015]] |
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[[Category:Oxfordian life]] |
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[[Category:Monotypic dinosaur genera]] |
[[Category:Monotypic dinosaur genera]] |
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[[Category: |
[[Category:Early Cretaceou dinosaurs of Asia]] |
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[[Category:Paleontology in Sichuan]] |
[[Category:Paleontology in Sichuan]] |
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Revision as of 00:07, 29 July 2019
Qijianglong Temporal range: Early Cretaceous, 115 Ma
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Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Clade: | Saurischia |
Clade: | †Sauropodomorpha |
Clade: | †Sauropoda |
Family: | †Mamenchisauridae |
Genus: | †Qijianglong Xing et al., 2015 |
Type species | |
Qijianglong guokr Xing et al., 2015
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Qijianglong is a monospecific genus of herbivorous mamenchisaurid sauropod dinosaur from the Early Cretaceous of China.[1]
Discovery
A vertebra of Qijianglong was first discovered in the early 1990s by farmer Cai Changming of Heba village, Sechuan, in his backyard. Work at a nearby construction site at Qijiang District uncovered a rich fossil quarry in 2006. Its excavation caused an examination of the earlier find which led to the discovery of a skeleton. In 2015, the type species Qijianglong guokr was named and described by Xing Lida (China University of Geosciences), Tetsuto Miyashita (University of Alberta), Zhang Jianping, Li Daqing, Ye Yong (Zigong Dinosaur Museum), Toru Sekiya (Fukui Prefectural Dinosaur Museum), Wang Fengping and Philip John Currie. The generic name combines the district Qijiang with Mandarin long, "dragon". The specific name guokr, "nutshell", is that of a Chinese scientific social network.[1]
The holotype QJGPM 1001 was found in a layer of the Suining Formation, which was seen as dating from the Late Jurassic but is now considered mid-Cretaceous (late Aptian) based on radiometric dating.[2] It consists of a partial skeleton with skull. It includes the rear of the skull, a partial right lower jaw, a complete series of seventeen neck vertebrae, the first six back vertebrae, ribs, the probable tenth tail vertebra, a series of twenty-eight rear tail vertebrae, chevrons, the left pubic bone and two upper pedal phalanges. It likely represents a juvenile individual, large but immature.[1]
The holotype of Qijianglong was about fifteen meters long and had a long neck. The describing authors established several distinguishing traits among which four autapomorphies. On the lower braincase the processus basipterygoideus has the form of a plate, is oriented along the body axis, and has an additional boss parallel to the tubera basilaria. The neck vertebrae have rear joint processes, postzygapophyses that next to their normal facets show on the outside an additional finger-shaped extension, stiffening the neck in the horizontal plane but allowing vertical movement. The rear neck vertebrae have pneumatopores, pneumatic openings, in the depression between the diapophysis, the upper rib joint process, and the neural spine. The pubic bone has a concave front edge, curving so strongly that its lower end is more directed to the front than to below.[1]
Systematics
Qijianglong was placed in the family Mamenchisauridae, in a relatively basal position but above Omeisaurus tianfuensis in the evolutionary tree.[1]
References
- ^ a b c d e Xing, L; Miyashita, T; Zhang, J; Li, Daqing; Ye, Y; Sekiya, T.; Wang F; Currie, P (26 Jan 2015). "'A new sauropod dinosaur from the Late Jurassic of China and the diversity, distribution, and relationships of mamenchisaurids'" (PDF). Journal of Vertebrate Paleontology. doi:10.1080/02724634.2014.889701.
- ^ Wang, J.; Norell, M. A.; Pei, R.; Ye, Y.; Chang, S.-C (2019). Surprisingly young age for the mamenchisaurid sauropods in South China. Cretaceous Research doi:10.1016/j.cretres.2019.07.006.
External links
- Qijianglong guokr: New Long-Necked Dinosaur Discovered in China Jan 29, 2015 by Sci-News.com