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A new genus and species of aplodontid rodent,  Proansomys dureensis , from the late Oligocene of the northern Junggar Basin of China is described. The new genus is referred to as Ansomyinae because the ectoloph on the upper cheek teeth, although not fully crested, has attained the same characteristic bucket-handle-shaped configuration as other members of the subfamily. It represents the earliest record of the subfamily yet discovered in Asia and is more plesiomorphic than species of the genus  Ansomys  in having a partly crested ectoloph, a lower degree of lophodonty, and less complex tooth basins (lacking accessory lophules).  Proansomys  has transitional features between  Prosciurus  and  Ansomys , suggesting that the Ansomyinae derived from a group of aplodontids related to  Prosciurus , as did other advanced aplodontid rodents. This provides new light on the paleobiogeography of the Ansomyinae.

A New Genus of Aplodontid Rodent (Mammalia, Rodentia) from the Late Oligocene of Northern Junggar Basin, China