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辽西义县组张氏中国猎龙(兽脚亚目:伤齿龙科)基于一新材料的头骨形态（英文）

辽西义县组张氏中国猎龙(兽脚亚目:伤齿龙科)基于一新材料的头骨...

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中国古生物学会第十二次全国会员代表大会暨第29届学术年会

作者：殷亚磊裴睿周长付 School of Earth and Space Sciences Peking University Paleontological Institute Shenyang Normal University Department of Earth Sciences the University of Hong Kong College of Earth Science and Engineering Shandong University of Science and Technology

sinovenator,with similarities to both troodontids and dromaeosaurids,has been found to be one of the most basal taxa of Troodontidae,and plays an important role in understanding the origin and the early evolution of this *** on the holotype(IVPP V12615),previous studies have described the morphology of the snout and the braincase of sinovenator changii,however,the anatomical details of the middle of the posterior portions of the cranium are still ***,a new specimen of sinovenator(PMOL-AD00102),from the lowest part of the Yixian Formation at the Lujiatun locality of western Liaoning,China,is *** fossil consists of an almost complete skull,partial mandibles and six articulated cervical *** is attributed to *** based on proposed diagnostic features of this species,such as a "T"-shaped cross-section of the *** used high-resolution computed tomographic(CT) technology to uncover the cranial anatomy of PMOLAD00102 that is still concealed in the *** new anatomical information not only adds our knowledge of the osteology of sinovenator,but also provides an opportunity to investigate the evolutionary trends in the palate and cranium of *** autapomorphies of *** include well-developed medial shelf on the jugal,lateral groove on the pterygoid flange of the ectopterygoid,slender bar in the parasphenoid recess,and lateral surface of the anterior cervical vertebrae bearing two pneumatic ***,this study concludes the braincase of sinovenator is not as primitive as previously suggested,although it still shows an intermediate state between derived troodontids and non-troodontid paravians by having an initial stage of the subotic recess and the otosphenoidal ***,this new specimen firstly reveals some novel and significant anatomical information of troodontids regarding the quadrate-quadratojugal articulation,the epipterygoid,the stapes,the atlantal ribs,etc.

关键词： Early Cretaceous Jehol Biota Yixian Formation sinovenator Troodontidae

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