湖北钟祥新第三纪的Amphicyon化石

<正> 半犬Amphicyon是食肉类犬科的一个绝灭属。曾生存于渐新世至早上新世的欧亚和北美大陆。中国新第三纪的Amphicyon化石研究得很少。自1939年寇伯特(Corbert,E.H.)研究了内蒙古通古尔的材料后,四十年来从未有过任何新的发现与报道。1978年夏,中国科学院古脊椎动物与古人类研究所顾玉珉和邱中郎两同志在湖北钟祥收集到一些哺乳动物牙齿化石。其中有几枚就是食肉类犬科Amphicyon的牙齿,很有意义,有记述的必要。与其共生的还有一些鹿的上、下牙齿及猴类的一枚上臼齿。这些标本皆产自湖北钟祥石碑公社肖店大队附近的灰绿白色泥质的粘土层中,时代可能为早上新世(或稍早)。

A NEW SPECIES OF AMPHICYON FROM THE PLIOCENE OF ZHONGXIANG,HUBEI

A new species of Amphicyon, Amphicyon youngi sp. nov., is discribed in the present paper. Its specimens ocurring in associated with a primitive Macaca and some cervids, were collected from a stratum of grey white marl, probably lower Pliocene, in Zhongxiang, Hupei province.The new species is characterized by the size slightly larger than A. tairunensis Colbert and by more advanced structure of cheek teeth; P_4 with a posterior-internal expansion; M_1 rather narrow, with paraconid taller, longer and stronger, metaconid seemingly robust, hypoconid lower and less treuchant; M_2 without paraconid and its talonid short; M_3 reduced. Judging from the above characters, the new species, Amphicyon youngi sp. nov., probably represented an advaneed form of Amphicyon.