【摘要】 对辽西凌源发现的全身长有羽毛的奔龙化石 (NGMC91) (Ji等 ,2 0 0 1)进行了再研究。根据头颅和头后骨骼的特征 ,其应归于中国鸟龙属 (SinornithosaurusXuetal.,1999)。由于研究的材料是一块处于非成年期的标本 ,虽然其有些特征明显与千禧中国鸟龙有别 ,但仍难以确定这些差异是否受个体发育的影响。因此 ,文中仍将其作为未定种 ,置于中国鸟龙属中。此外 ,文章还简要讨论了羽毛的发生和早期演化 ,认为羽毛出现的初始功能就是为了保持体温 ,与后期的飞行功能无关更多还原

【Abstract】 This paper deals with a small dromaeosaurid dinosaur with feathers over its entire body (NGMC91), which has been studied and reported by Ji et al. in 2001. According to some characteristics of its skull and postcranial skeleton, this dromaeosaurid dinosaur should be surely designated into Genus Sinornithosaurus (Xu et al., 1999). Although there exist some differences between this animal and Sinornithosaurus millenii (Xu et al., 1999) in their characters, it is very difficult to decide whether these differences are caused by their ontogenetic stages or not, because the dromaeosaurid dinosaur studied herein is considered to be a sub adult individual. Therefore, this small theropod dinosaur is considered as an indeterminate species of Genus Sinornithosaurus . In addition, some problems of the origin and early evolution of feathers are also briefly discussed in this paper. The myriad findings of flightless dinosaurs with feathers from western Liaoning, which have been shown by independent phylogenetic studies outside of the Avialae, provide important evidence that the origin of feathers is unrelated to the origin of flight in the Avialae.更多还原