Sinotyrannus is a genus of proceratosaurid tyrannosauroid. Despite being not much younger than Dilong, another basal tyrannosaur, Sinotyrannus was very large in size (10 m), closer to that of Tyrannosaurus than Dilong.
Sinotyrannus is known from a single incomplete fossil specimen including a partial skull, from the Early Cretaceous Jiufotang Formation (app.120 million years ago) of Liaoning, China.
Ji, Q.; Ji, S.-A.; Zhang, L.-J. 2009. First large tyrannosauroid theropod from the Early Cretaceous Jehol Biota in northeastern China. Geological Bulletin of China 28 (10): 1369–1374.
