Abstract: Four lagomorphs , Gobiolagus major, Hypsimylusyihesubuensis sp. nov. , Desmatolagus cf. D. vetustus ,and Desmatolagus sp. from a new late Eocene locality, Yihesubu, Nei Mongol, are described. Upper dental morphology of Gobiolagus major is known for the first time. Hypsimylus yihesu buensis sp. nov. helps to demonstrate this genus a lagomorph , not a eurymylid. The taxonomic position of D. vetustus , the most primitive species of Desmatolagus, is reconsidered.

摘要： 记述了内蒙古自治区脑木根乡附近依和苏布地点产出的4种兔形类上下颊齿化石。 依和苏布位于脑木根乡东南约 18 km 处 ,乌兰希热平台北缘 ,地理坐标为 N42°36. 114′, E111° 34. 596′。依据化石组合 ,该点地层年代初步定为晚始新世。4 种兔形类分别是: Gobiolagus major、Hypsimylus yihesubuensis sp. nov.、Desmatolagus cf. D. vetustus 以及 Desmatolagus sp.。 新发现的 Gobiolagu