Shantungosaurus

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Shantungosaurus giganteus
Temporal range: Late Cretaceous, 70Ma
Laika ac Dino Kingdom 2012 (7882291466).jpg
Restored skeleton
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Clade: Ornithopoda
Family: Hadrosauridae
Clade: Euhadrosauria
Subfamily: Saurolophinae
Genus: Shantungosaurus
Hu, 1973
Species: † S. giganteus
Binomial name
Shantungosaurus giganteus
Hu, 1973
Synonyms
  • Zhuchengosaurus maximus Zhao et al., 2007
  • Huaxiaosaurus aigahtens? Zhao et al., 2011

Shantungosaurus, meaning "Shandong Lizard", is a genus of saurolophine hadrosaurid dinosaurs found in the Late Cretaceous Wangshi Formation of the Shandong Peninsula in China.[1] The stratigraphic interval of Shantungosaurus ranges from the top of the Xingezhuang Formation to the middle of the Hongtuya Formation.[2] Shantungosaurus is so far the largest hadrosauroid taxon in the world: the greatest length of its femur is about 1.7 m, and the greatest length of its humerus is about 0.97 m.

Description[edit]

Shantungosaurus (blue) compared with other giant ornithopods
Restoration

Shantungosaurus giganteus is one of the largest known ornithischians, the type skull is 1.63 metres (5.3 ft) long[1] and the composite skeleton mounted at the Geological Institute of China in Beijing measures 14.72 metres (48.3 ft) in length[3] while another mounted skeleton, originally referred to "Zhuchengosaurus maximus", measures 16.6 metres (54 ft) in length.[4] The largest individuals may have weighted as much as 16 tonnes (18 short tons).[5] Like all hadrosaurs its beak was toothless, but its jaws were packed with around 1,500 tiny chewing teeth. A large hole near its nostrils may have been covered by a loose flap, which could be inflated to make sounds.

Discovery and species[edit]

First described in 1973, Shantungosaurus is known from over five incomplete skeletons. Chinese scientist Xing Xu and his colleagues indicate that Shantungosaurus is very similar to and shares many unique characters with Edmontosaurus, forming an Asian node of EdmontosaurusShantungosaurus clade, based on the new materials recovered in Shandong. Remains of several individuals, including skull bones, limb bones, and vertebrae, were found in Shandong, China. These specimens were classified in the new genus and species Zhuchengosaurus maximus in 2007.[4] However, further study showed that the supposedly distinct features of Zhuchengosaurus were simply a result of different growth stages.[6]

Recent maximum parsimony analyses of Hadrosauroidea recovered a stable sister group relationship between Edmontosaurus and Shantungosaurus. Shantungosaurus is the single hadrosaurid from the Zhucheng area that is considered valid. Zhuchengosaurus and Huaxiaosaurus, both of which are known from the same region, are interpreted here as junior synonyms of Shantungosaurus. All unequivocal morphological discrepancies among these three taxa could be attributed to intraspecific variation (ontogenetic and polymorphic variation) and post-depositional distortion.[2]

References[edit]

  1. ^ a b Hu Chengzhi; Cheng Zhengwu; Pang Qiping; Fang Xiaosi (2001). Shantungosaurus giganteus (in Chinese). Beijing: Geological Publishing House. pp. 123–135 [English abstract]. ISBN 7-116-03472-2. 
  2. ^ a b Xing, Hai; Zhao, Xijin; Wang, Kebai; Li, Dunjing; Chen, Shuqing; Mallon, Jordan C; Zhang, Yanxia; Xu, Xing (In Press). "Comparative osteology and phylogenetic relationship of Edmontosaurus and Shantungosaurus (Dinosauria: Hadrosauridae) from the Upper Cretaceous of North America and East Asia". Acta Geologica Sinica-English Edition.  Check date values in: |date= (help)
  3. ^ Glut, Donald F. (1997). "Shantungosaurus". Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. pp. 816–817. ISBN 0-89950-917-7. 
  4. ^ a b Zhao, X.; Li, D.; Han, G.; Hao, H.; Liu, F.; Li, L.; Fang, X. (2007). "Zhuchengosaurus maximus from Shandong Province". Acta Geoscientia Sinica 28 (2): 111–122. doi:10.1007/s10114-005-0808-x. 
  5. ^ Horner, John R.; Weishampel, David B.; Forster, Catherine A (2004). "Hadrosauridae". In Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.). The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 438–463. ISBN 0-520-24209-2. 
  6. ^ Ji, Y., Wang, X., Liu, Y., and Ji, Q. (2011). "Systematics, behavior and living environment of Shantungosaurus giganteus (Dinosauria: Hadrosauridae)." Acta Geologica Sinica (English Edition), 85(1): 58-65. doi:10.1111/j.1755-6724.2011.00378.x

External links[edit]