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临夏盆地早中新世上庄组的巨獠犀门齿化石

期刊名称：古脊椎动物学报. 核心期刊
时间：0
分类：Q915.877[天文地球—古生物学与地层学;生物学—古生物学]
作者机构：[1]中国科学院古脊椎动物与古人类研究所、中国科学院脊椎动物演化与人类起源重点实验室,北京100044, [2]西北大学地质学系,西安710069
相关基金：中国科学院战略性先导专项（编号：XDB03020104）、国家重点基础研究发展计划项目（编号：2012CB821906）和国家自然科学基金重点项目（批准号：40730210）资助.Acknowledgements I am grateful to Qiu Zhanxiang, Wang Banyue, Hou Sukuan, Shi Qinqin, Chen Shaokun, Wang Shiqi, and Xie Guangpu for their support in the fieldwork. I thank Lawrence Flynn for his English improvement and Gao Wei for his photographs.
相关项目：中国新近纪哺乳动物演化对重大气候环境变化的响应

关键词：甘肃临夏盆地, 中新世, 犀科, 巨獠犀, Linxia Basin, Gansu, China, Early Miocene, Rhinocerotidae, Aprotodon

中文摘要：

记述了在临夏盆地早中新世地层中发现的兰州巨獠犀（Aprotodonlanzhouensis）的下门齿化石，其特点为非常粗壮并强烈弯曲。新材料的发现使巨獠犀在临夏盆地的延续时代跨越渐新世／中新世界线的推测得到完全证实。巨獠犀分布的地质时代和地理范围与巨犀重合，但巨獠犀的化石地点和个体数量都相当稀少。巨獠犀的下颌形态功能特点指示其生活于晚始新世至早中新世中国西北、南亚和中亚干旱环境地带中镶嵌分布的少量近水环境。巨獠犀在中中新世之前彻底绝灭，其原凼可能是气候变化的结果，也说明临夏盆地早中新世的环境特征与晚渐新世的疏林系统相似，而不同于中中新世的茂密森林。

英文摘要：

Lower incisor fossils ofAprotodon lanzhouensis collected from the Early Miocene deposits in the Linxia Basin, are described in this paper. Characteristically, they are relatively robust and strongly curved. The discovery of the new specimens causes the occurrence of Aprotodon across the Oligo-Miocene boundary in the Linxia Basin to be completely confirmed. The chronological and geographical distribution of Aprotodon was essentially coincident with that of giant rhinos, but the localities and numbers of individuals recording Aprotodon were relatively rare. The mandibular morphological function of Aprotodon suggests that this form lived in sparse riparian mosaics within the arid part of northwestem China, and South and Central Asia from the Late Eocene to the Early Miocene. Aprotodon experienced total extinction before the Middle Miocene, which possibly resulted from climatic changes. The pattern of occurrence of Aprotodon also indicates that the climatic and environmental conditions of the Linxia Basin during the Early Miocene were similar to relatively open woodlands of the Late Oligocene, in contrast to dense forests of the Middle Miocene.

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