Abstract

Absent from Miocene and Pleistocene assemblages of Yushe Basin, prometheomyine Arvicolinae are a common and characteristic element of Pliocene faunas. Two time-successive species of the genus Germanomys are well represented in the Gaozhuang and Mazegou formations and serve as index fossils for Gaozhuangian and Mazegouan faunas. The genus Germanomys is well known in the Pliocene of Europe, but the oldest Yushe Germanomys (at about 4.7 Ma) is appreciably older than the European records, yet relatively derived in stage of evolution of crown height and sinuousity of the base of the enamel on molars. The younger Germanomys species is late Pliocene in age, higher crowned, and shows a more derived sinuous line. In addition to the Germanomys lineage that is well represented in the Yushe Pliocene sequence, we find evidence of the distinct genus Stachomys and perhaps another prometheomyine in Yushe Basin.

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