Sinotyrannus

Sinotyrannus (meaning "Chinese tyrant") is a genus of large basal tyrannosauroid dinosaur, a close relative of tyrannosaurids which flourished in North America and Asia during the late Cretaceous period. Sinotyrannus is known from a single incomplete fossil specimen including a partial skull, from the Early Cretaceous Jiufotang Formation of Liaoning, China. Though it is not much younger than primitive tyrannosauroids such as Dilong, it is similar in size to later forms such as Tyrannosaurus. It was much larger than contemporary tyrannosauroids; reaching a total estimated length of 10 meters (33ft), it is the largest known theropod from the Jehol Biota. The type species is S. kazuoensis, described by Ji et al., in 2009.[1]