禄丰古猿地点的猪尾鼠类化石

本文记述亚洲首次发现的猪尾鼠类化石。材料系1983年于云南禄丰古猿地点最晚中新世石灰坝组采集到的,计有代表两属三种——Platacanthomys dianensis sp.nov.,Typhlomysprimitivus sp.nov.和T.hipparionum sp.nov.的百余枚牙齿。文中除对新种的形态作了描述和对比外,还对猪尾鼠类的分类位置及系统发育作了探讨。

FOSSIL PLATACANTHOMYIDS FROM THE HOMINOID LOCALITY OF LUFENG,YUNNAN

Knowledge of platacanthomyids is only based on three genera,Platacanthomys,Typhlomys and Neocometes.The first two forms are extant monotypic genera,occuring in the Oriental biogeographic region,while the latter is the unique extinct genus,found in the mid-Miocene of Europe.Platacanthomyids have no premolar cheek teeth and the molars are moderately high crowned.Their upper cheek teeth are unilaterally hyposodont(lingual higber than labial). The cusps are usually poorly developed,but there are some enamel ridges and depressions on the crown.The upper molars have six basic ridges:anteroloph,protoloph,mesoloph,meta- loph,posteroloph and endoloph,while the lower molars are composed of anterolophid,ante- rior extra ridge,metalophid,mesolophid,posterior extra ridge,posterolophid and endolophid. The mid-ridges(the anterior extra ridge,protoloph,mesoloph and metaloph for the upper molars,and the anterior extra ridge,metalophid,mesolophid and posterior extra ridge for the lower molars)are more or less parallel obliquely cross the surface of crown. Material described in this paper is the first record of fossil platacanthomyids in Asia,and was collected in 1983 by screen washing the deposits of Section D of Shihuiba,the hominoid locality of Lufeng,Yunnan.Based on 112 isolated teeth,three species belonging to two genera, Platacanthomys dianensis sp.nov.,Typhlomys primitivus sp.nov.and T.hipparionum sp.nov. are recognized.Associated with the platacanthomyids are more than 100 taxa of vertebrates (see Qi,1985).On the basis of our current understanding of mammals,an uppermost Mio- cene age(Baodian)was supported for the Lufeng fauna.