Small mammal fauna from Wulanhuxiu (Nei Mongol, China) implies the Irdinmanhan-Sharamurunian (Eocene) faunal turnover
Small mammal fauna from Wulanhuxiu (Nei Mongol, China) implies the Irdinmanhan-Sharamurunian (Eocene) faunal turnover
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乌兰湖秀（中国内蒙古）的小型哺乳动物群暗示了伊尔丁曼罕至沙拉木鲁阶（始新世）动物群更替
DOI：
10.4202/app.00292.2016
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发表时间：
2016-12-01
影响因子：
1.8
通讯作者：
Fostowicz-Frelik, Lucja
中科院分区：
文献类型：
--
作者：
Li, Qian;Wang, Yuan-Qing;Fostowicz-Frelik, Lucja
乌兰湖秀是中国内蒙古二连盆地中始新世的一个地区，一般认为它属于乌兰施热组，与伊尔丁曼哈组划等号。从乌兰湖秀裸露的地层中识别出两个不同时代的独立哺乳动物群。较低的化石层包含一种相似的，罕见的双重身份的代表（Gomphos progressus sp. nov., Mimolagus， Erenlagus和Strenulagus）和各种各样的近趾类。这些分类群的组合指向了伊尔迪曼汉时代，但动物群的一个元素（Schlosseria）可能代表了阿尚斯坦的遗迹。总体而言，该组合包括“古胎盘”哺乳动物和“新胎盘”哺乳动物。上层层的物种较少，唯一存在的古胎盘动物是罕见的齿齿动物。然而，这个视界上有大量的Gobiolagus lagomorph遗骸（包括颅后材料）和Gobiomys（啮齿目）的高级形式的存在，并且最有可能是Sharamurunian时代。因此，乌兰湖秀记录了中国始新世记录中古胎盘被新胎盘所取代的过程，尽管这一过程并不完整。
Wulanhuxiu, a middle Eocene locality in the Erlian Basin, Nei Mongol (China) has been commonly regarded as belonging to the Ulan Shireh Formation, equated with the Irdin Manha Formation. We recognized two separate mammalian faunas of different age from the beds exposed at Wulanhuxiu. The lower fossiliferous horizon contains an anagalid, uncommon duplicidentate representatives (Gomphos progressus sp. nov., Mimolagus, Erenlagus, and Strenulagus), and diverse perissodactyls. This combination of taxa points to an Irdinmanhan age, but one element of the fauna (Schlosseria) may represent an Arshantan relic. Overall, the assemblage comprises "paleoplacental" mammals mixed with "neoplacentals". The upper horizon is less species-rich and the only paleoplacentals present are scarce creodonts. However, this horizon is marked by abundant remains (including postcranial material) of the lagomorph Gobiolagus and by the presence of an advanced form of Gobiomys (Rodentia), and is most probably Sharamurunian in age. Thus, Wulanhuxiu documents replacement, albeit incomplete, of paleoplacentals by neoplacentals in the Chinese Eocene record.