临夏盆地早中新世上庄组的巨獠犀门齿化石(英文)  

Incisor fossils of Aprotodon (Perissodactyla, Rhinocerotidae) from the Early Miocene Shangzhuang Formation of the Linxia Basin in Gansu, China

作　　者：邓涛[1,2] 

机构地区：[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

出　　处：《古脊椎动物学报》2013年第2期131-140,共10页Vertebrata Palasiatica

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);国家自然科学基金重点项目(批准号:40730210)资助

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(Aprotodon lanzhouensis)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,其原因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。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.

关 键 词：甘肃临夏盆地 中新世 犀科 巨獠犀 

分 类 号：Q915.877[天文地球—古生物学与地层学]