Abstract: The close relatives of Ctenodactylidae were present early in Eocene of Asia. As basal members of early rodents, they are important for us to understand the early history of rodents. In the present paper a new genus and species, Hohomys lii, referred to Youmyidae, and a specimen of gen. indet., referred to Cocomyidae, are des. cribed. They were collected from Yuhuangding Formation near Wangjiazhai Village, Xijiadian Town, Danjiangkou City (formerly Junxian County), Hubei. The taxa of the vertebrate fauna associated with these two new ctenodactyloid rodents are Rhombomylus cf.turpanensis, R. SP., Advenimus hubeiensis, A. SP., cf. Heptondon sp., Asiocoryphodon conicus, Heterocoryphodon flerowi and Zhongvuanus sichuanensis etc., which suggest an age of late Early Eocene.

摘要： 详细记述了发现于甘肃玉门大山口上二叠统波罗晰类的新材料。依据其齿列特征—向前倾伏的弯钩状的门齿和横宽的具旁侧单一齿尖的颊齿，将其归入Belebey vegrandis Ivachnenko 1972。这是波罗蜥类在中国的首次发现，具有重要的地层和古生物地理意义。