Abstract: The present paper deals with a new species of Pliocene Ursus, on the basis of one skull with two associated mandibles and a single right mll ). The new, materials, excavated from the reddish brown breccia of a cave deposit in Yinan, Shandong, with a maximum thick— ness of 4.2m, turn out to represent the first reliable record of middle Pliocene Ursus ever found in China.

摘要： 本文记述了产自山东沂南一洞穴堆积中的熊类化石一新种:Ursus yinanensis。这种熊具有个体较小，前臼齿数目全，下裂齿的下后尖之前尚未出现附尖等原始性特征，它与欧洲早上新世的Ursus boeckhi在进化程度上比较接近但更显进步。这是在中国首次发现的中上新世Ursus的可靠记录，它的发现对于探讨欧亚大陆上真正熊类的演化及地理分布等间题具有重要意义。