山西省左云县发现一禽龙类新属种
发布时间:2015年12月24日
国际古生物学杂志历史生物学(Historical Biology)最近在线发表了题为“中国山西省左云地区晚白垩世早期的第二种鸭嘴龙超科恐龙”的研究成果。该研究工作由山西地质博物馆、中科院古脊椎所和bet365官方下载的研究人员共同完成。此项研究受国家自然科学基金、国家重点基础研究项目(973项目)以及北京市新世纪百千万人才工程项目资助。
文章报道了产自于山西省左云县晚白垩世早期助马堡组的第二个基干鸭嘴龙类属种—黄氏左云龙(Zuoyunlong huangi)。左云龙保存了不完整的右侧髂骨和坐骨。该类群的自近裔性状为:“髂骨的后髋臼突很短,在长度上仅为中央板的50%”。线性测量数据的定量分析证实了这一观点。支序分析的结果显示左云龙和原巴克龙构成了姐妹群关系。根据当前的系统发育布局和生物地理学资料判断,鸭嘴龙超科从亚洲向北美洲的第一次迁徙活动很可能发生于早白垩世和晚白垩世之间的界线附近。
A second hadrosauroid dinosaur from the early Late Cretaceous of Zuoyun, Shanxi Province, China
Run-Fu Wanga, Hai-Lu Youb*, Suo-Zhu Wanga, Shi-Chao Xua, Jian Yia, Li-Juan Xiea, Lei Jiaa and Hai Xingc*
aShanxi Museum of Geology, Taiyuan 030024, P. R. China;
bKey Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, P. R. China;
cBeijing Museum of Natural History, Beijing Academy of Science and Technology, Beijing 100050, P. R. China
Abstract:
A second basal hadrosauroid dinosaur, Zuoyunlong huangi gen. et sp. nov. is reported from the early Late Cretaceous Zhumapu Formation in Zuoyun County, Shanxi Province, northern China. Zuoyunlong preserves a partial right ilium and ischium, and is unique in having a very short postacetabular process 50% as long as the iliac central plate. Our cladistic analysis recovers Zuoyunlong as the most basal Late Cretaceous hadrosauroid, with a sister-taxon relationship with Probactrosaurus from the late Early Cretaceous of Inner Mongolia. Including Zuoyunlong, four Cenomanian basal hadrosauroids have been recorded, and the two taxa in North America (Eolambia and Protohadros) represent the earliest known hadrosauroids outside of Asia. In the light of the proposed phylogenetic topology and biogeographic data, the discovery of Zuoyunlong indicates that the first dispersal of hadrosauroids from Asia to North America probably happened around the boundary between the Early and Late Cretaceous.
Key words:
Dinosauria; Hadrosauroidea; Shanxi; Zuoyun; Late Cretaceous; Cenomanian
*Corresponding authors. Email: youhailu@ivpp.ac.cn; xinghai@www.mlclubs.com
图1 黄氏左云龙的不完整右髂骨(邢海供图)
图2 黄氏左云龙的不完整右坐骨(邢海供图)
图3 展示左云龙系统学位置的鸭嘴龙形类系统发育树(邢海供图)