湖北淅川盆地上白垩统蜥脚类幼年个体新材料

描述湖北郧县淅川盆地晚白垩世地层中产出的蜥脚类恐龙化石。标本不关联保存于马家村组中段灰绿色含钙泥质粉砂岩中，材料包括牙齿、脊椎和肢骨化石等。从愈合特征（如分离的椎体和椎弓）分析，这些化石至少由2个未成年个体组成。这些化石体现出的特征组合，如股骨近端外侧突出，近端外缘向内侧倾斜，荐前椎气腔构造发育，以及牙齿呈细长的棒状，表明湖北郧县马家村组地层发现的蜥脚类可归入巨龙形类中的多孔椎龙类或者更进步的类群。新材料的发现对于进一步了解中国乃至东亚地区白垩纪晚期的蜥脚类恐龙分布和演化具有一定的意义。

NEW MATERIAL OF JUVENILE SAUROPOD FROM THE UPPER CRETACEOUS OF XICHUAN BASIN, HUBEI PROVINCE

New sauropod material was collected from the Upper Cretaceous Majiacun Formation of Xichuan Basin, Yunxian County, Hubei Province, central China, including two nearly complete teeth, a number of vertebrae, and some limb bones, which are derived from at least two individuals. The separate preservations of all centra and neural arches suggest that the specimens are juvenile individuals. Several features, such as proximal one-third of femoral shaft deflected medially, cervical and dorsal vertebrates composed of spongy bone, and very slender peglike teeth, suggest that these specimens are referable to the Somphospondyli or more exclusive clade within the Titanosauriformes. The new find provides further evidence for the dominance of the Titanosauriformes in eastern Asia during the Late Cretaceous.