Abstract: The present paper describes one species of dormouse Microdyromys wuae Qiu, 1996 and two new species of gerbils Mellalomys gansus sp. nov. and Myocricetodon plebius sp. nov. collected from the upper Xianshuihe Formation at Quantougou, Gausu, followed by a discussion of the Quantougou Fauna biochronology, biogeography and paleoecology. Gerbils in this fauna represent the earliest record of the family Gerbillidae in China. Faunal correlation indicates that the Quantougou Fauna resembles the middle Miocene Tunggur Fauna of Nei Mongol (Inner Mongolia) both chronologically and ecologically. The occurrence of gerbils at Quantougou suggests that the Quantougou Fauna was adapted to a more xeric open habitat than the Tunggur Fauna.

摘要： 记述了甘肃兰州永登泉头沟发现的一种睡鼠, Microdyromys wuae Qiu ,1996 和沙鼠科的二个新种, Mellalomys gansus sp. nov. 与Myocricetodon plebius p. nov. ,同时讨论了泉头沟动物群的生物年代学、动物地理学和古生态学问题。泉头沟动物群中的沙鼠类是迄今所知该科动物在我国最早的化石记录。小哺乳动物的组合表明,泉头沟动物群与内蒙古中中新世通古尔动物群的时代和指示的生态环境大体近似,但沙鼠类的出现,似乎指示了泉头沟动物群代表更为干旱和开