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Letter
Nature 439, 715-718 (9 February 2006) | doi:10.1038/nature04511; Received 12 October 2005; Accepted 5 December 2005
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A basal tyrannosauroid dinosaur from the Late Jurassic of China
Xing Xu1,2, James M. Clark3, Catherine A. Forster4, Mark A. Norell2, Gregory M. Erickson5, David A. Eberth6, Chengkai Jia1 & Qi Zhao1
- Institute of Vertebrate Paleontology and Paleoanthropology, Beijing 100044, China
- American Museum of Natural History, New York, New York 10024, USA
- Department of Biological Sciences, George Washington University, Washington DC 20052, USA
- Department of Anatomical Sciences, Stony Brook University, Stony Brook, New York 11794, USA
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306, USA
- Royal Tyrrell Museum, Drumheller, Alberta T0J 0Y0, Canada
Correspondence to: Xing Xu1,2 Correspondence and requests for materials should be addressed to X.X. (Email: xingxu@vip.sina.com or Email: xu@amnh.org).
Abstract
The tyrannosauroid fossil record is mainly restricted to Cretaceous sediments of Laurasia, although some very fragmentary Jurassic specimens have been referred to this group1, 2. Here we report a new basal tyrannosauroid, Guanlong wucaii gen. et sp. nov., from the lower Upper Jurassic of the Junggar Basin3, 4, northwestern China. G. wucaii is the oldest known tyrannosauroid and shows several unexpectedly primitive pelvic features5, 6. Nevertheless, the limbs of G. wucaii share several features with derived coelurosaurs7, 8, 9, and it possesses features shared by other coelurosaurian clades10. This unusual combination of character states provides an insight into the poorly known early radiation of the Coelurosauria. Notably, the presumed predatory Guanlong has a large, fragile and highly pneumatic cranial crest that is among the most elaborate known in any non-avian dinosaur and could be comparable to some classical exaggerated ornamental traits among vertebrates.
- Institute of Vertebrate Paleontology and Paleoanthropology, Beijing 100044, China
- American Museum of Natural History, New York, New York 10024, USA
- Department of Biological Sciences, George Washington University, Washington DC 20052, USA
- Department of Anatomical Sciences, Stony Brook University, Stony Brook, New York 11794, USA
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306, USA
- Royal Tyrrell Museum, Drumheller, Alberta T0J 0Y0, Canada
Correspondence to: Xing Xu1,2 Correspondence and requests for materials should be addressed to X.X. (Email: xingxu@vip.sina.com or Email: xu@amnh.org).
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