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A new, large tyrannosaurine theropod from the Upper Cretaceous of China

2011; Elsevier BV; Volume: 32; Issue: 4 Linguagem: Inglês

10.1016/j.cretres.2011.03.005

1095-998X

David W. E. Hone, Kebai Wang, Corwin Sullivan, Zhao Xijin, Shuqing Chen, Dunjin Li, JI Shu'an, Qiang Ji, Xing Xu,

Evolution and Paleontology Studies

Tyrannosaurids are primarily gigantic, predatory theropod dinosaurs of the Cretaceous. Here we report a new member of the tyrannosaurid clade Tyrannosaurinae from the Upper Cretaceous Wangshi Group of Zhucheng, Shandong Province, China, based on a maxilla and associated dentary. The discovery of this animal, here named Zhuchengtyrannus magnus gen. et sp. nov., adds to the known diversity of tyrannosaurids in Asia. Z. magnus can be identified by a horizontal shelf on the lateral surface of the base of the ascending process, and a rounded notch in the anterior margin of the maxillary fenestra. Several additional features contribute to a unique combination of character states that serves to further distinguish Z. magnus from other taxa. Comparisons with other tyrannosaurids suggest that Zhuchengtyrannus was a very large theropod, comparable in size to both Tarbosaurus and Tyrannosaurus.