Named By: Dong et al - 1978.
Synonyms: Szechuanosaurus zigongensis.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Allosauroidea, Sinraptoridae.
Species: Y. shangyouensis (type), Y. zigongensis.
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.
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.
- [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.