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A Large Therizinosauroid(Dinosauria:Theropoda) from the Early Cretaceous of Northwestern China

Acta Geologica Sinica(English Edition) 2007年第4期81卷 539-549页

作者： LI Daqing PENG Cuo YOU Hailu Matthew C. LAMANNA Jerald D. HARRIS Kenneth J. LACOVARA ZHANG Jianping China University of Geosciences School of Earth Sciences and Resources Beijing 100083 P. R. China Fossil Research and Development Center of the Third Geology and Mineral Resources Exploration Academy of Gansu Province Lanzhou Gansu Province 730050 P. R. China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 P. R. China Section of Vertebrate Paleontology Carnegie Museum of Natural History Pittsburgh Pennsylvania 15213 USA Dixie State College Science Building Utah 84770 USA Paleontology and Geology Program Department of Bioscience and Biotechnology Drexel University Philadelphia Pennsylvania 19104 USA

We herein describe an associated partial postcranial skeleton of a theropod dinosaur discovered in the Lower Cretaceous Xinminpu Group of the Yujingzi Basin, in the jiuquan area of Gausu Province, northwestern China. Features of its humerus, such as strongly expanded proximal and distal ends, a well developed medial tuberosity, distal condyles expressed on the humeral cranial surface, and a hypertrophied entepicondyle, definitively establish the therizinosauroid affinities of the specimen. It differs from other therizinosauroids in having a shallow, poorly demarcated glenoid fossa with a prominent rounded and striated tumescence on the dorsomedial surface of its scapular portion, and a pubis with a strongly concave cranial margin. It represents a new taxon, Suzhousaurus megatherioides gen. et sp. nov. Cladistic analysis recovers Suzhousaurus as the sister taxon of Nothronychus mckinleyi from the mid-Cretaceous of western North America; together, they are basal members of the Therizinosauroidea, more derived than the Early Cretaceous Falcarius and Beipiaosaurus but less derived than Alxasaurus and the Therizinosauridae. Along with ＂Nanshiungosaurus＂ bohlini from possibly coeval beds in the Mazongshan area of northern-most Gansu, Suzhousaurus represents one of the largest-known Early Cretaceous therizinosauroids, demonstrating that this clade attained considerable body size early in its evolutionary history.

关键词： Dinosauria Theropoda Therizinosauroidea Yujingzi Basin Early Cretaceous jiuquan area Gansu Province China

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