Abstract: During the 1980's-1990's a few isolated teeth of fossil primates were collected from theUpper Eocene beds in Eren Region, Nei Mongol. They represent the first records of the Primates in Late Eocene of Nei Mongol. The discovery has not only expanded the distribution of the Primates in Asia, added new elements to the Late Eocene faunas of Nei Mongol, but also provided with new information on paleozoogeography and paleoenvironment of this area.

摘要： 记录了内蒙古晚始新世的3种原始灵长类化石(Eosimia sp. A, Eosimias sp. B和Pseudoloris erenensis sp. nov. )。Eosimias sp. A系该属个体较大者，仅小于E．paukkaungensis。Eosimias sp. B个体较小，齿冠较低，主尖较细小。Pseudoloris erenensis的主要特征为：个体小，m2的下次小尖较靠舌侧，无颊、舌侧齿带等。Eosimias在内蒙古上始新统的发现，表明内蒙古在晚始新世时也是高等灵长类活动的舞台。过去已知仅分布于欧洲的Pseudoloris在内蒙古上始新统的发现表明，哺乳动物在晚始新世时，在亚、欧间已有某种交流。上述发现还表明，内蒙古地区晚始新世的气候可能属亚热带型，有过树木繁茂的林地。