| Pygostyle-like Structure from Beipiaosaurus (Theropoda, Therizinosauroidea) from the Lower Cretaceous Yixian Formation of Liaoning, China |
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| 作者姓名： | XU Xing CHENG Yennien WANG Xiaolin and CHANG Chunhsiang Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing Chin E-mail: xu.xing@ivpp.ac.cn Division of Geology National Museum of Natural Science Taichung China Wang Si'en and Xie Guanglian |
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| 作者单位： | XU Xing，CHENG Yennien，WANG Xiaolin and CHANG Chunhsiang Institute of Vertebrate Paleontology and Paleoanthropology，Chinese Academy of Sciences，Beijing 100044，China; E-mail: xu.xing@ivpp.ac.cn Division of Geology，National Museum of Natural Science，Taichung，China Wang Si'en and Xie Guanglian |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，中国科学院资助项目 |
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| 摘 要： | Pygostyle was previously considered as a unique structure of ornithothoracine birds, used to maneuver tail feathers. A similar structure from an oviraptorosaurian dinosaur was considered functionally associated with the rectrices as in birds. We report a pygostyle-like structure from a therizinosauroid dinosaur. The presence of filamentous integuments, but absence of rectrices, on the tail of this therizinosauroid, combined with other lines of evidence, suggests that the initial function of the pygostyle was not related to the rectrices.
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| 关 键 词： | 类尾综骨结构 白垩纪 中国 辽宁 形成 恐龙 化石 古动物学 分类 |
Pygostyle-like Structure from Beipiaosaurus (Theropoda, Therizinosauroidea) from the Lower Cretaceous Yixian Formation of Liaoning, China |
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| Authors: | XU Xing CHENG Yennien WANG Xiaolin and CHANG Chunhsiang Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing Chin E-mail: xuxing@ivppaccn Division of Geology National Museum of Natural Science Taichung China Wang Si'en and Xie Guanglian |
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| Abstract: | Pygostyle was previously considered as a unique structure of ornithothoracine birds, used to maneuver tail feathers. A similar structure from an oviraptorosaurian dinosaur was considered functionally associated with the rectrices as in birds. We report a pygostyle-like structure from a therizinosauroid dinosaur. The presence of filamentous integuments, but absence of rectrices, on the tail of this therizinosauroid, combined with other lines of evidence, suggests that the initial function of the pygostyle was not related to the rectrices. |
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| Keywords: | pygostyle-like structure Therizinosauroidea Yixian Formation western Liaoning China |
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