Biology:Chilantaisaurus

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Short description: Theropod dinosaur genus from the Late Cretaceous period

Chilantaisaurus
Temporal range: Late Cretaceous, 92 Ma
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Chilantaisaurus tashuikouensis skeleton.jpg
Skeleton reconstruction of Chilantaisaurus tashuikouensis
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: Avetheropoda
Genus: †Chilantaisaurus
Hu, 1964
Species:
†C. tashuikouensis
Binomial name
†Chilantaisaurus tashuikouensis
Hu, 1964

Chilantaisaurus ("Jilantai Salt Lake (zh) lizard"[1]) is a genus of large theropod dinosaur, possibly a neovenatorid or a primitive coelurosaur, from the Late Cretaceous Ulansuhai Formation of China (Turonian age, about 92 million years ago). The type species, C. tashuikouensis, was described by Hu in 1964.

Description

Life restoration

Chilantaisaurus was a large theropod, measuring 11 metres (36 ft) long and weighing 2.5–4 metric tons (2.8–4.4 short tons).[2][3][4] While Brusatte et al. (2010) estimated that Chilantaisaurus might have weighed about 6 metric tons (6.6 short tons) based on femur length similar to that of Tyrannosaurus,[5] Persons et al. (2020) argued that greater femoral circumference indicates the greater capacity to withstand greater locomotor loads, not greater body mass.[6]

Classification

Skeletal diagram showing known elements of C. tashuikouensis

Hu considered Chilantaisaurus to be a carnosaur related to Allosaurus,[1] though some subsequent studies suggested that it may be a spinosauroid, possibly a primitive member of the spinosaurid family (Sereno, 1998; Chure, 2000; Rauhut, 2001) because it had large claws on the forelimbs thought to be unique to that group. Other studies suggested that it could be a member of an alternate offshoot of neotetanuran theropods, with some similarities to allosauroids, spinosauroids, and coelurosaurians.[7]

A 2009 study noted that it was difficult to rule out the possibility that Chilantaisaurus was the same animal as the carnosaur Shaochilong, which is from the same geological formation. However, they did note an enormous size difference between the two.[8] Further study by Benson, Carrano and Brusatte found that it was not as closely related to Shaochilong as first thought, but that it was a carnosaur (of the family Neovenatoridae), closely related to Allosaurus as Hu had initially thought.[2] Phylogenetic analysis published by Porfiri et al. in 2018 recovered Chilantaisaurus as a primitive coelurosaurian.[9]

Manual ungual from the holotype, Tianjin Natural History Museum

Several species have been described based on very poor remains. The species "Chilantaisaurus" sibiricus (previously informally known as either Allosaurus? sibiricus or Antrodemus? sibiricus) is based on a single distal metatarsal discovered in 1915 in the Turginskaya Svita of the Buryat Autonomous Soviet Socialist Republic, Russia , dating to the Early Cretaceous periods (Berriasian to Hauterivian stages).[10][11][12] It is poorly described, so its relationships cannot be accurately determined (Chure, 2000) and its placement as a species of Chilantaisaurus is highly questionable. "Chilantaisaurus" maortuensis was reclassified as Shaochilong maortuensis in 2009.[8]

An additional species named in 1979, "Chilantaisaurus" zheziangensis, based on bones from the foot and a partial tibia,[13] is actually a therizinosaur taxon.[14][15]

The cladogram below follows a 2016 analysis by Sebastián Apesteguía, Nathan D. Smith, Rubén Juarez Valieri, and Peter J. Makovicky based on the dataset of Carrano et al. (2012).[16]

Allosauroidea 
 

Metriacanthosauridae Yangchuanosaurus NT (flipped).jpg

 
Allosauria
 

Allosauridae Allosaurus Revised.jpg

 
Carcharodontosauria
 

Carcharodontosauridae Giganotosaurus BW.jpg

 
Neovenatoridae
 
 

Deltadromeus Deltadromeus silhouette.svg

 
 

Gualicho Gualicho shinyae restoration.jpg

 
 
 
 

Neovenator Neovenator.png

 
 
 

Chilantaisaurus Chilantaisaurus.jpg

 
 

Megaraptora Australovenator reconstruction.jpg

 
 
 
 
 
 
 

References

  1. ↑ 1.0 1.1 Hu, S.-Y. (1964). "Carnosaurian remains from Alashan, Inner Mongolia" (in zh, en). Vertebrata PalAsiatica 8 (1): 42–63. http://www.ivpp.cas.cn/cbw/gjzdwxb/xbwzxz/200912/P020091230393410738156.pdf. 
  2. ↑ 2.0 2.1 Benson R.B.J.; Carrano M.T.; Brusatte S.L. (2010). "A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic". Naturwissenschaften 97 (1): 71–78. doi:10.1007/s00114-009-0614-x. PMID 19826771. Bibcode: 2010NW.....97...71B. 
  3. ↑ Paul, G.S. (1988). Predatory Dinosaurs of the World. New York: Simon and Schuster. p. 314. ISBN 9780671619466. https://archive.org/details/predatorydinosau00paul_114. 
  4. ↑ Paul, Gregory S. (2016). The Princeton Field Guide to Dinosaurs. Princeton University Press. pp. 104. ISBN 978-1-78684-190-2. OCLC 985402380. http://worldcat.org/oclc/985402380. 
  5. ↑ Brusatte, S.L.; Chure, D.J.; Benson, R.B.J.; Xu, X. (2010). "The osteology of Shaochilong maortuensis, a carcharodontosaurid (Dinosauria: Theropoda) from the Late Cretaceous of Asia". Zootaxa 2334: 1–46. doi:10.11646/zootaxa.2334.1.1. http://mapress.com/zootaxa/2010/f/z02334p046f.pdf. 
  6. ↑ Persons, S. W.; Currie, P. J.; Erickson, G. M. (2020). "An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex". The Anatomical Record 303 (4): 656–672. doi:10.1002/ar.24118. ISSN 1932-8486. PMID 30897281. 
  7. ↑ Benson, R.B.; Xu, X. (2008). "The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China". Geological Magazine published online (6): 778–789. doi:10.1017/S0016756808005475. Bibcode: 2008GeoM..145..778B. http://eprints.esc.cam.ac.uk/889/1/Benson_and_Xu_2008.pdf. 
  8. ↑ 8.0 8.1 Brusatte, S., Benson, R., Chure, D., Xu, X., Sullivan, C., and Hone, D. (2009). "The first definitive carcharodontosaurid (Dinosauria: Theropoda) from Asia and the delayed ascent of tyrannosaurids." Naturwissenschaften, doi:10.1007/s00114-009-0565-2
  9. ↑ Juan D. Porfiri; Rubén D. Juárez Valieri; Domenica D.D. Santos; Matthew C. Lamanna (2018). "A new megaraptoran theropod dinosaur from the Upper Cretaceous Bajo de la Carpa Formation of northwestern Patagonia". Cretaceous Research 89: 302–319. doi:10.1016/j.cretres.2018.03.014. 
  10. ↑ Riabinin, 1915. Zamtka o dinozavry ise Zabaykalya [A note on a dinosaur from the trans-Baikal region]. Trudy Geologichyeskago Muszeyah Imeni Petra Velikago Imperatorskoy Academiy Nauk. 8(5), 133-140.
  11. ↑ Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 563-570. ISBN:0-520-24209-2.
  12. ↑ "Coelurosauria". http://theropoddatabase.com/Coelurosauria.htm#Chilantaisaurussibiricus. 
  13. ↑ Dong, Z. (1979). "Cretaceous dinosaur fossils in southern China" (in zh). Mesozoic and Cenozoic Redbeds in Southern China. Beijing: Science Press. pp. 342–350.  Translated paper
  14. ↑ Zanno, L. E. (2010). "A taxonomic and phylogenetic re-evaluation of Therizinosauria (Dinosauria: Maniraptora)". Journal of Systematic Palaeontology 8 (4): 503–543. doi:10.1080/14772019.2010.488045. https://www.academia.edu/361763. 
  15. ↑ Qian, M.-P.; Zhang, Z.-Y.; Jiang, Y.; Jiang, Y.-G.; Zhang, Y.-J.; Chen, R.; Xing, G.-F. (2012). "浙江白垩纪镰刀龙类恐龙" (in chinese). Journal of Geology 36 (4): 337−348. https://drive.google.com/file/d/1yaOx8akNGlrbtOgXjyZznSAAK43WxcMH/view. 
  16. ↑ Sebastián Apesteguía; Nathan D. Smith; Rubén Juárez Valieri; Peter J. Makovicky (2016). "An Unusual New Theropod with a Didactyl Manus from the Upper Cretaceous of Patagonia, Argentina". PLOS ONE 11 (7): e0157793. doi:10.1371/journal.pone.0157793. PMID 27410683. Bibcode: 2016PLoSO..1157793A. 

External links

Wikidata ☰ Q134633 entry



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