湖北省西北部发现鸭嘴龙类化石新材料
发布时间:2015年11月25日
国内古生物学期刊古脊椎动物学报(Vertebrata PalAsiatica)在2015年第三期在线发表了题为“湖北上白垩统马家村组的鸭嘴龙超科新材料”的最新研究成果。这一研究由内蒙古龙昊地质古生物研究所、gb28365-2012、中科院古脊椎所以及郧县恐龙蛋国家地质公园的研究人员共同完成;我馆青年学者邢海参与了此项研究。此项研究受国家自然科学基金和国家留学基金委资助。
文章报道了一些在属种级别上不确定的鸭嘴龙类材料;标本发现于湖北省西北地区与河南交界的淅川盆地西南部的上白垩统马家村组中段。鸭嘴龙超科的骨骼化石和分散的恐龙蛋共存于同一层位,大部分材料属于未离巢晚期和幼年早期的个体发育阶段。这一状况被解释为未离巢和幼年早期阶段的个体与成年个体之间的地域分隔。骨学对比研究确认了至少两个鸭嘴龙超科的类群:其中一个类群可能代表了一个相对进步的基干鸭嘴龙类,而另一个类群则很可能归属于鸭嘴龙亚科。中桑顿期马家村组中段的鸭嘴龙亚科化石填补了鸭嘴龙亚科进化谱系的早期空白,并且提供了鸭嘴龙亚科乃至鸭嘴龙科亚洲起源的新证据。
New hadrosauroid material from the Upper Cretaceous Majiacun Formation of Hubei Province, central China
TAN Qingwei1 XING Hai2,3,4,* HU Yongguo5 TAN Lin1 XU Xing3
(1 Long Hao Institute of Geology and Paleontology Hohhot 010010)
(2 Beijing Museum of Natural History Beijing 100050 *E-mail: xinghaiivpp@gmail.com)
(3 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044)
(4 School of Earth Sciences and Resources, China University of Geosciences Beijing 100083)
(5 Yunxian Dinosaur Eggs National Geological Park Yunxian 442500)
Abstract The Xichuan Basin is situated along the northwestern border between Henan and Hubei Provinces in central China, and includes a thick accumulation of Upper Cretaceous sediments. Here we report and describe some indeterminate hadrosauroid material on the genus level, which was retrieved from the middle Majiacun Formation (Upper Cretaceous) in the southwestern area of the Xichuan Basin, northwest Hubei Province. The hadrosauroid remains occur with scattered dinosaur eggs at the same horizon. The majority of the bones may come from the late nestling and early juvenile stages. This condition could be best explained by the geographic segregation of the nestlings and early juveniles from the herd consisting of older individuals, as reported in some hadrosaurids. A minimum of two hadrosauroid taxa are identified through direct morphological comparisons: one may represent a relatively derived non-hadrosaurid hadrosauroid, and the other probably pertains to Hadrosaurinae. Considering the younger age of North American hadrosaurines, the presence of hadrosaurine material within the middle Santonian middle portion of the Majiacun Formation provides new evidence for the Asian origins of both Hadrosaurinae and Hadrosauridae.
Key words Late Cretaceous, middle Santonian, northwest Hubei Province, Majiacun Formation, Lijiagou bonebed, hadrosauroid material
图1 不能确定属种的马家村组鸭嘴龙亚科材料(邢海供图)
图2 不能确定归属的马家村组鸭嘴龙超科尾椎椎体(邢海供图)
图3 年代和地层信息限定的鸭嘴龙科系统发育树(邢海供图)