Pozdniakov A A
Zh Obshch Biol. 1995 Mar-Apr;56(2):172-8.
An analysis of variability of the crown pattern of the first lower molars in gray voles has indicated the existence of two trends in its transformation, the "pitimoid" and the "ratticepoid" ones. The first trend is characteristic of Microtus, whereas the second one is found in Alexandromys. These taxa differ also by diploid chromosome numbers. This regular pattern of variability is discussed from the taxonomic standpoint.
对灰田鼠第一下臼齿冠型变异性的分析表明，其在形态转变上存在两种趋势，即“坑状型”和“网格状型”。第一种趋势是田鼠属的特征，而第二种趋势见于东方田鼠属。这些分类单元在二倍体染色体数目上也存在差异。从分类学角度对这种有规律的变异模式进行了讨论。
