Nemegtosaurus

Jak číst taxoboxNemegtosaurus
Stratigrafický výskyt: Svrchní křída, asi před 72 až 68 miliony let
alternativní popis obrázku chybí
Rekonstrukce hlavy a části krku nemegtosaura
Vědecká klasifikace
Říšeživočichové (Animalia)
Kmenstrunatci (Chordata)
Třídaplazi (Sauropsida)
Nadřáddinosauři (Dinosauria)
Řádplazopánví (Saurischia)
Podřádsauropodomorfové (Sauropodomorpha)
Infrařádsauropodi (Sauropoda)
NadčeleďTitanosauria
ČeleďNemegtosauridae
RodNemegtosaurus
Binomické jméno
Nemegtosaurus mongoliensis
Nowinski, 1971
Některá data mohou pocházet z datové položky.

Nemegtosaurus (v překladu "ještěr z (údolí) Nemegt") byl rod menšího sauropodního dinosaura ze skupiny Titanosauria, objeveného polskými paleontology v mongolské poušti Gobi. Roku 1971 byl popsán pod druhovým názvem N. mongoliensis. Rodové jméno je odvozeno od geologického souvrství Nemegt, v jehož svrchnokřídových sedimentech byl objeven. Druh Opisthocoelicaudia skarzynskii může být ve skutečnosti stejným dinosaurem.[1]

Popis

Je možné, že jeho lebka byla dlouhá a štíhlá; tvar zubů nejspíše odpovídal kolíkům, podobně jako u většiny sauropů. Příbuzným rodem byl nejspíš Quaesitosaurus. Nemegtosauři žili asi před 70 miliony let, v období maastrichtu (nejpozdnější křídy). Dosahoval délky kolem 12 metrů a hmotnosti zhruba 5 tun.[2] Podle jiných odhadů mohl vážit až kolem 9500 kg.[3]

Další druh

V roce 1977 byl čínským paleontologem Dongem Zhimingem popsán další předpokládaný druh tohoto rodu, N. pachi, ten je však v současné době klasifikován jako nomen dubium (pochybné jméno).[4]

Lebka v expozici muzea ve Varšavě.

Fosilní zub z úzkou korunkou, objevený v souvrstvích Udurčukan a Blahoveščensk v Amurské oblasti na ruském Dálném východě je morfologicky velmi podobný zubům rodu Nemegtosaurus a mohl patřit zástupci blízce příbuzného (nebo identického) rodu sauropodního dinosaura.[5]

Paleoekologie

Tito středně velcí až velcí sauropodní dinosauři se mohli stávat příležitostnou kořistí obřího tyranosaurida rodu Tarbosaurus, se kterým sdíleli ekosystémy pozdně křídového Mongolska.[6]

Odkazy

Reference

  1. ↑ SOCHA, Vladimír. Opisthocoelicaudia skarzynskii. OSEL.cz [online]. 15. března 2021. Dostupné online.  (česky)
  2. ↑ Holtz, Thomas R., Jr.; Rey, Luis V. (2007). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages (Aktualizovaný internetový dodatek). New York: Random House. ISBN 978-0-375-82419-7.
  3. ↑ Larramendi, A.; Paul, G. S.; Hsu, S.-y. (2020). A review and reappraisal of the specific gravities of present and past multicellular organisms, with an emphasis on tetrapods. Anatomical Record. 304 (9): 1833-1888.
  4. ↑ Madzia, D. & M. Borsuk-Białynicka (2014). New sauropod material from the Nemegt Formation supports the conspecificity of Opisthocoelicaudia skarzynskii and Nemegtosaurus mongoliensis (Sauropoda, Titanosauria). Journal of Vertebrate Paleontology 34 (Supplement to volume 5): 173A–174A.
  5. ↑ A. O. Averianov, Yu. L. Bolotsky & I. Yu. Bolotsky (2022)[2023]. A Sauropod from the Late Cretaceous of the Amur Region. Doklady Earth Sciences. 507 (Suppl 3): S418–S419. doi: https://doi.org/10.1134/S1028334X22601547
  6. ↑ http://www.osel.cz/10651-co-prozradily-tarbosauri-zuby.html

Literatura

  • Nowinski, A. (1971). Nemegtosaurus mongoliensis n. gen., n. sp. (Sauropoda) from the uppermost Cretaceous of Mongolia. Palaeontologia Polonica 25: 57-81.
  • Wilson, J. (2005). Redescription of the Mongolian sauropod Nemegtosaurus mongoliensis Nowinski (Dinosauria: Saurischia) and comments on Late Cretaceous sauropod diversity. Journal of Systematic Palaeontology. 3. 283 - 318. 10.1017/S1477201905001628.
  • Schmitz, L.; Motani, R. (2011). Nocturnality in dinosaurs inferred from scleral ring and orbit morphology. Science. 332 (6030): 705–708. doi:10.1126/science.1200043
  • Philip J. Currie, Jeffrey A. Wilson, Federico Fanti, Buuvei Mainbayar &, Khishigjav Tsogtbaatar (2017). Rediscovery of the type localities of the Late Cretaceous Mongolian sauropods Nemegtosaurus mongoliensis and Opisthocoelicaudia skarzynskii: Stratigraphic and taxonomic implications. Palaeogeography, Palaeoclimatology, Palaeoecology. doi: https://doi.org/10.1016/j.palaeo.2017.10.035
  • Alexander O. Averianov and Alexey V. Lopatin (2019). Sauropod diversity in the Upper Cretaceous Nemegt Formation of Mongolia—a possible new specimen of Nemegtosaurus. Acta Palaeontologica Polonica. doi: https://doi.org/10.4202/app.00596.2019

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