地质学报（英文版）2004，Vol.78Issue(1)：22-26,5.
A New Troodontid (Theropoda:Troodontidae) from the Lower Cretaceous Yixian Formation of Western Liaoning, China
A New Troodontid (Theropoda:Troodontidae) from the Lower Cretaceous Yixian Formation of Western Liaoning, China
摘要
Abstract
A specimen collected from the Lower Cretaceous Yixian Formation of western Liaoning, China, represents a new genus and species of troodontid theropod. The new taxon is named and described on the basis of the holotype and the only known specimen, which comprises an articulated skeleton with the presacral vertebral, shoulder girdle and forelimbs missing as preserved. Diagnostic features of the new species include nasals that are sinusoid in lateral view, absence of a passage connecting the antorbital and maxillary fenestrae, relatively large teeth, plate-like chevrons forming a band along most of the length of the tail, and a long neck between the femoral head and shaft. The temporal constraints of the three paravian groups (Troodontidae, Dromaeosauridae and Aves) combined with the character distributions among the earliest known troodontids indicate a rapid evolution at the base of the Troodontidae.关键词
Early Cretaceous/Yixian Formation/Troodontidae/western Liaoning/ChinaKey words
Early Cretaceous/Yixian Formation/Troodontidae/western Liaoning/China引用本文复制引用
XU Xing,WANG Xiaolin..A New Troodontid (Theropoda:Troodontidae) from the Lower Cretaceous Yixian Formation of Western Liaoning, China[J].地质学报（英文版）,2004,78(1):22-26,5.基金项目
the National Natural Science Foundation of China, National Geographic Society, Special Funds for Major State Basic Research Projects of China,and Chinese Academy of Sciences for financial support. （）
