Abstract: This paper reports a new tillodont species, Yuesthonyx tingae gen. et sp. nov., belonging to a new family, Yuesethonychidae. The new taxa is created based on the materials collected from the Late Paleocene Dazhang Formation of the Tantou Basin, Henan Province, in 1978. The associated mammal fossil in the Dazhang Formation is a mandible of pseudictopid (Anagalida) (Tong and Wang, 1980). We also briefly review the Asian tillodonts and noticed the tillodonts were diversified during Early Paleocens.

摘要： 古新世晚期裂齿类——丁氏豫裂兽(新属、新种) (Yuesthonyx tingae gen. et sp. nov.) 的发现表明了裂齿目在亚洲古新世已相当分化,在臼齿形态上有与北美始新世Esthonyx 相近的小尖兽(Meiostylogon)和中间兽(Interogale) ,也有与北美Megalesthonyx 接近的豫裂兽等。根据豫裂兽、Megalesthonyx 、和亚洲的Adapidium 的上臼齿都具有明显的中附尖等特征可与其他裂齿类相区别,新建了豫裂兽科Yuesthoncidae Fam.