云南禄丰、元谋晚中新世古猿地点始鼠科化石

<正>始鼠科(Eomyidae)是一类绝灭了的啮齿类动物,渐新世和中新世时广布全北区,但亚洲远没有欧洲和北美常见。中国含始鼠类化石地点不多,发现的属只有渐新世的Eomys、Eomyodon和Pseudotheridomys,以及中新世的Keramidomys和Leptodontomys(Zheng and Li,1982；Falhbusch et al．,1983；Wang and Emry,1991；Qiu,1996；Wang,2002)。本文描述的云南始鼠类化石,系1983年在禄丰石灰坝和1999、2000年在元谋雷老两个古猿地点采集到的。材料不多,但至少代表始鼠科的两个新属,为我国惟一采自南方,并与古猿类共生的稀少啮齿类动物。新种的模式产地均为禄丰石灰坝。

EOMYIDS (MAMMALIA: RODENTIA) FROM THE LATE MIOCENE LUFENG AND YUANMOU HOMINOID LOCALITIES, YUNNAN

The material which forms the basis of this study was collected from two hominoid localities, Shihuiba of Lufeng and Leilao of Yuanmou,in Yunnan Province in the last twenty years.Five forms of eomyid rodents,Plesieomys mirabilis gen.et sp.nov.,Heteroeornys yunnanertsis gen.et sp.nov.,Lepto- dontomys pusillus sp.nov.,Leptodontomys sp.and Eomyidae gen.et sp.indet,are now recognized in the two late Miocene faunas.Morphologically,Plesieomys n.gen.shows some similarities to Pseudadjidaumo Lindsay,1972 of North America,but the phylogenetic relationship of the new genus to the American genus is uncertain.Heteroeomys exhibits a mixture of primitive and advanced dental features of bunodont eomyids and might be descended from an early Eomys species.Leptodontomys pusillus is characterized by its smaller size,weaker developed lingual anteroloph on M1/2,narrow anterolophid and poor mesolo- phid and hypolophid on ml/2.The eomyid record in Yunnan indicates that eomyid rodents are a wide- ranging family in Asia,and that forested habitats are preferred more by eomyids with bunodont cheek- teeth than by eomyids with lophodont cheek-teeth.