云南昭通盆地水塘坝地点的褐煤沉积出产中新世末期脊椎动物化石。为增加小哺乳动物的样品，我们在2014年对出产化石的沉积物开展尝试性筛洗。通过筛洗，获得了4颗竹鼠的牙齿。这种竹鼠个体极大，远大于水塘坝已知的竹鼠，代表了一个新种。新种的臼齿尺寸明显大于所有已知的Miorhizomys 种类，臼齿高冠，齿沟内充填白垩质，不甚前后向压缩。新种在水塘坝的出现年代为6.2-6.7 Ma。这一发现显示，在约6 Ma现生属Rhizomys 在山西北部地区出现之前，已绝灭的Miorhizomys 就展现出了较高的多样性。

The Shuitangba subbasin lignite deposits of the Zhaotong Basin in northern Yunnan Province have produced vertebrate fossils of terminal Miocene age. We conducted test wet screening of fossiliferous sediment in 2014 to increase representation of small mammals. This effort produced four teeth of a very large bamboo rat, much larger than the previously known bamboo rat present at Shuitangba, and representing a new species. This new species is characterized by its molars being remarkably larger than those of other known species of Miorhizomys , and being hypsodont with cementum, and less anterorposteriorly compressed. The age of this new species from Shuitangba is in the range of 6.2 to 6.7 Ma. It appears that diverse bamboo rats of the extinct genus Miorhizomys were present in the Late Miocene of Yunnan, somewhat before the 6 Ma appearance of extant Rhizomys to the north in the vicinity of Shanxi Province.