A new crested theropod dinosaur from the Early Jurassic of Yunnan Province, China

分类： 地球科学 >> 地质学 提交时间： 2017-08-10 合作期刊: 《古脊椎动物学报》

WANG Guo-Fu YOU Hai-Lu PAN Shi-Gang WANG Tao

摘要： A new crested theropod, Shuangbaisaurus anlongbaoensis gen. et sp. nov., is reported. The new taxon is recovered from the Lower Jurassic Fengjiahe Formation of Shuangbai County, Chuxiong Yi Autonomous Prefecture, Yunnan Province, and is represented by a partial cranium. Shuangbaisaurus is unique in possessing parasagittal crests along the orbital dorsal rims. It is also distinguishable from the other two lager-bodied parasagittal crested Early Jurassic theropods (Dilophosaurus and Sinosaurus) by a unique combination of features, such as higher than long premaxillary body, elevated ventral edge of the premaxilla, and small upper temporal fenestra. Comparative morphological study indicates that “Dilophosaurus” sinensis could potentially be assigned to Sinosaurus, but probably not to the type species. The discovery of Shuangbaisaurus will help elucidate the evolution of basal theropods, especially the role of various bony cranial ornamentations had played in the differentiation of early theropods. 报道了具嵴冠的兽脚类恐龙一新属种，安龙堡双柏龙(Shuangbaisaurus anlongbaoensis gen.et sp. nov.)。双柏龙发现于云南省楚雄彝族自治州双柏县下侏罗统冯家河组中，保存了部分头骨带下颌。双柏龙沿两侧眼眶背缘向上有嵴冠发育，这在其他兽脚类中未曾报道过。与其他早侏罗世体型较大且具一对矢状嵴冠的兽脚类(双嵴龙属和中国龙属)相比，双柏龙还独具一些特征组合，如相对较高的前颌骨体、抬高的前颌骨腹缘、后腹向延伸的轭骨后突及较小的上颞孔。比较研究表明，尽管中国“双嵴龙” (“Dilophosaurus” sinensis)可能应归入中国龙属(Sinosaurus), 但未必属于模式种。双柏龙的发现将有助于研究基干兽脚类的演化，尤其是各类头骨骨饰在其中的作用。

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