Basal tyrannosauroids from China and evidence for protofeathers in tyrannosauroids

  title={Basal tyrannosauroids from China and evidence for protofeathers in tyrannosauroids},
  author={Xing(徐星) Xu and Mark A. Norell and Xuewen Kuang and Xiaolin Wang and Qi Zhao and Chengkai Jia},
Tyrannosauroids are one of the last and the most successful large-bodied predatory dinosaur groups, but their early history remains poorly understood. Here we report a new basal tyrannosauroid from the Early Cretaceous Yixian Formation of western Liaoning, China, which is small and gracile and has relatively long arms with three-fingered hands. The new taxon is the earliest known unquestionable tyrannosauroid found so far. It shows a mosaic of characters, including a derived cranial structure… 
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