Archivo: Mamenchisaurus Species Scale Steveoc86

Descripción: A scale diagram showing four different Mamenchisaurus species, M. constructus, M. youngi, M. hochuanensis and M. sinocanadorum. • M. construtus was described in 1954 and is the type species of Mamenchisaurus.[1] The species was founded on a fragmentary specimen (IVPP V. 790); Therefore, the proportions shown here are not absolute but based on various reconstructions of the type specimen and other mamenchisaurs.• Mamenchisaurus is sometimes considered a 'wastebasket taxon', with numerous questionable species assigned to the genus.[2] With future revisions of the genus, it's possible that some, or all, of the referred species get removed from Mamenchisaurus.•M. hochuanensis (CCG V 20401), described in 1972, and M. youngi described in 1996 (ZDM 0083), are known from more complete type specimens with articulated remains.[3][4] Another memenchisaur specimen, ZDM0126, was referred to M. hochuanensis in 2001. This specimen is often used to fill in some of the missing areas of the M. hochuanensis type specimen, such as the forelimbs and skull. However, a 2020 study cast doubt on the referral.[2] The silhouette above is based on reconstructions that combine CCG V 20401 and ZDM0126.•M. sinocanadorum, described in 1993, is based on a very fragmentary holotype specimen; material includes a lower jaw and four cervical vertebrae. It has been estimated at ~26 m in length with a ~12 m long neck.[5][6] Two large neck vertebrae were discovered that probably belong to a giant mamenchisaur but they have yet to be formally described. These vertebrae are from the same formation that M. sinocanadorum was discovered and might be the same species. If these vertebrae do belong to M. sinocanadorum, they suggest it could grow larger than shown here.[7][8][9]M. sinocanadorum is very incomplete, and the silhouette shown above is speculative. It's possible that with more remains, the proportions end up very different than shown here.• M. youngi silhouette based on a skeletal reconstruction by Scott Hartman. [2] M.constructus silhouette modified from [3], M. hochuanensis modified from [4]. M. sinocanadorum is modified from M. hochuanensis.• Humans scaled to 170 cm (5 ft 7 in) and 160 cm (5 ft 3 in).References ↑ Young, C.C. (1954), On a new sauropod from Yiping, Szechuan, China. sinica, III(4), 481-514. ↑ a b (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. ↑ PI, L., OU, Y. and YE, Y. 1996. A new species of sauropod from Zigong, Sichuan, Mamenchisaurus youngi. 87–91. In DEPARTMENT OF SPATIAL PLANNING AND REGIONAL ECONOMY (ed.), Publication in Geoscience Contributed to the 30th International Geological Congress. China Economic Publishing House, Beijing. ↑ Young, C.C., and Zhao, X.-J. (1972). "Mamenchisaurus hochuanensis sp. nov." Institute of Vertebrate Paleontology and Paleoanthropology Monographs, A, 8:1-30. ↑ Russell, D.A., Zheng, Z. (1993). "A large mamenchisaurid from the Junggar Basin, xinjiang, People Republic of China." Canadian Journal of Earth Sciences, (30): 2082-2095. ↑ Taylor M.P. (2012). Why sauropods had long necks; and why giraffes have short necks, [1] ↑ Paul, G.S. (2016). The Princeton Field Guide to Dinosaurs Second Edition, Princeton University Press. ↑ Paul, G.S. (2016) http://dml.cmnh.org/2017Jan/msg00090.html. ↑ Paul, G.S. (2019). "Determining the largest known land animal: A critical comparison of differing methods for restoring the volume and mass of extinct animals". Annals of the Carnegie Museum 85 (4): 335–358. DOI:10.2992/007.085.0403.
Título: Mamenchisaurus Species Scale Steveoc86
Créditos: Trabajo propio
Autor(a): Steveoc 86
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Licencia: CC BY-SA 3.0
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