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A New Giant Compsognathid Dinosaur with Long Filamentous Integuments from Lower Cretaceous of Northeastern China

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Abstract：
A new compsognathid dinosaur, Sinocalliopteryx gigas gen. et sp. nov., is erected based on a complete skeleton from the Early Cretaceous Yixian Formation of western Liaoning, northeastern China. It shares the features with Huaxiagnathus orientalis in having a manus as long as the humerus plus radius, very large and subequally long manual claws Ⅰ and Ⅱ, and reduced olecranon process on the ulna. But it differs from Huaxiagnathus orientalis in having the much large size, a very long maxillary process of premaxilla not extending the vertical level of the maxillary antorbital fossa, and the proportionally longer ulna and so on. Sinocalliopteryx gigas gen. et sp. nov. represents the largest species among the known compsognathid dinosaurs, suggesting the tendency of the body enlargement in compsognathids to some extent. The long filamentous integuments are attached to the whole body of this compsognathid, confirming that such integuments evolved firstly in the basal coelurosaurs. This new giant compsognathid was a fierce carnivorous theropod, as shown further by an incomplete dromaeosaurid leg inside its abdominal cavity.
作者：
Author： JI Shu'an[1]    JI Qiang[2]    L(U) Junchang    YUAN Chongxi
作者单位：
  1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
  2. Key Laboratory of Stratigraphy and Paleontology, Chinese Academy of Geological Sciences, Beijing 100037
期 刊： 地质学报（英文版）   SCI
Journal： ACTA GEOLOGICA SINICA
年，卷(期)： 2007, 81(1)
分类号： P5
Keywords： Compsognathidae 知识脉络    Sinocalliopteryx gen. nov. 知识脉络    giant skeleton 知识脉络    filamentous integuments 知识脉络    Yixian Formation 知识脉络    Early Cretaceous 知识脉络    western Liaoning 知识脉络   
机标分类号： P46 F30
基金项目： 国家重点基础研究发展计划(973计划)，国家自然科学基金，中国地质调查局资助项目
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