记泥河湾盆地晚上新世—早更新世䶄亚科(Arvicolinae)和鼢鼠亚科(Myospalacinae)五新种
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郑绍华, 张颖奇, 崔宁
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Five new species of Arvicolinae and Myospalacinae from the Late Pliocene-Early Pleistocene of Nihewan Basin
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ZHENG Shao-Hua, ZHANG Ying-Qi, CUI Ning
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Table 1 Average width and rate of closedness of isthmuses and SDQ on m1 of related arvicoline species1) from China
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| Species | average width (mm)|rate of closedness (%)2) | | min.|mean|max., n | | n | Is 1 | Is 2 | Is 3 | Is 4 | Is 5 | Is 6 | Is 7 | | SDQ | | Borsodia chinensis | 26 | 0.04|100 | 0.05|81.0 | 0.04|100 | 0.05|100 | 0.21|0 | 0.22|0 | 0.41|0 | | 53|67|85, 21 | | B. prechinensis sp. nov. | 1 | 0.07|100 | 0.08|100 | 0.07|100 | 0.07|100 | 0.17|0 | 0.29|0 | na | | 91|91|91, 1 | | B. mengensis | 5 | 0.05|100 | 0.10|80.0 | 0.07|100 | 0.07|80.0 | 0.25|0 | 0.31|0 | 0.40|0 | | 101|115|122, 5 | | Mimomys nihewanensis sp. nov. | 58|55 | 0.06|92.5 | 0.15|0 | 0.09|61.7 | 0.08|63.6 | 0.36|0 | 0.47|0 | na | | 112|138|168, 43 | | M. orientalis | 41|19 | 0.06|100 | 0.13|26.3 | 0.10|47.4 | 0.07|94.7 | 0.30|0 | 0.41|5.3 | 0.45|0 | | 113|132|157, 21 | | Pitymys simplicidens sp. nov. | 1 | 0.03|100 | 0.03|100 | 0.03|100 | 0.03|100 | 0.16|0 | 0.08|100 | 0.22|0 | | 62|62|62, 1 |
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