Name: Yangchuanosaurus ‭(‬Yangchuan lizard‭)‬.
Phonetic: Yang-chwan-oh-sore-us.
Named By: Dong et al‭ ‬-‭ ‬1978.‭
Synonyms: Szechuanosaurus zigongensis.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ Allosauroidea, ‬Sinraptoridae.
Species: Y.‭ ‬shangyouensis‭ (‬type‭)‬,‭ ‬Y. zigongensis.
Diet: Carnivore.
Size: Largest individuals estimated up to‭ ‬10.8‭ ‬meters long.
Known locations: China‭ ‬-‭ ‬Shaximiao Formation.
Time period: Bathonian/Callovian of the Jurassic..
Fossil representation: Two partial skeletons.

       Yangchuanosaurus is often likened to fulfilling the same ecological niche as Allosaurus,‭ ‬except in Asia instead of North America.‭ ‬Not only does Yangchuanosaurus have a similar morphology to Allosaurus it also had access to similar prey items such as stegosaurs and sauropods.‭ ‬Yangchuanosaurus had a characteristic growth on top of its nose as well as smaller horns and ridges,‭ ‬and also possessed a tail that made up half of its total length.‭
       The first specimen of Yangchuanosaurus was discovered by a construction worker working upon the construction of a dam in Sichuan Province.‭ ‬This revealed an eight meter individual.‭ ‬In‭ ‬1983‭ ‬however the second specimen and species of Yangchuanosaurus was discovered from the same formation,‭ ‬and this time the remains revealed an individual estimated to be just under eleven meters long.‭ ‬This gives Yangchuanosaurus another similarity to Allosaurus‭ ‬as it has an average length of eight meters with some individuals suggesting up to eleven meters as well.
       There was once a third species of Yangchuanosaurus,‭ ‬however this has since been found to represent another but closely related Asian theropod called Sinraptor.

Further reading
- [A new carnosaur from Yongchuan County, Sichuan Province]. - Ke Xue Tong Bao [Science Newsletter] 23(5):302-304. - Z. Dong, Y. Zhang, X. Li & S. Zhou - 1978.
- A new species of Szechuanosaurus from the Middle Jurassic of Dashanpu, Zigong, Sichuan. - Vertebrata PalAsiatica 31(4): 308-314. - Y. Gao - 1993.


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