山西榆社晚中新世竹鼠一新种

本文描述了采自山西榆社盆地上第三系竹鼠类化石的一新种。新种与Rhizomys(Brachyrhizomyr)rhanriur相似,但个体较小,臼齿相对狭长,M,保留有连接下次尖和下次脊的齿襞(mure)及短的下中脊。这两种化石竹鼠在榆社的出现,超越了现生竹鼠类分布的北界,说明该科的情况要比以前知道的更为复杂,也表明榆社地区在晚第三纪时比近代湿润。

A NEW BAMBOO RAT FROM THE LATE MIOCENE OF YUSHE BASIN

A new species of rhizomyid rodent is described from late Neogene deposits of Yushe Basin, Shanxi Province. It resembles Rhizomys (Brachyrhizomys) shansius, but differs in its smaller and proportionally narrower molars, and retention of a inure and short mcsolophid on M_3. That two bamboo rats occurred in the late Neogene of this region, beyond the northern limit of present distribution for the family, indicates greater diversity than previously known and moister conditions than at present.