(pronounced YAHNG-CHWAHN-oh-SAWR-us) Yangchuanosaurus was a meat-eating dinosaur, a theropod with small arms and big jaws. It was similar to Allosaurus . It dates from the late Jurassic perid , about 163 to 145 million years ago. 
Yangchuanosaurus “Yang-ch’uan lizard” from Late Jurassic China. Named by Chinese paleontologists Zhiming Dong, Dr. Mee-Mann Chang, Li Jinling, and Shiwu Zhou in 1978.