Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China.
PLoS One. 2013;8(1):e52625. doi: 10.1371/journal.pone.0052625. Epub 2013 Jan 24.
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.
描述了一种新的栉齿鼠科啮齿动物属和种，即来自中国准噶尔盆地北部晚渐新世的杜氏拟栉齿鼠（Proansomys dureensis）。这个新属被归为栉齿鼠亚科（Ansomyinae），因为上颊齿的外齿脊虽然没有完全隆起，但已经具有与该亚科其他成员相同的特征桶柄状构型。它代表了亚洲迄今发现的该亚科最早的记录，并且比属中的种更为原始，因为它具有部分隆起的外齿脊、较低程度的齿脊发育和更简单的齿窝（缺乏附属齿脊）。Proansomys 具有介于 Proscirus 和 Ansomys 之间的过渡特征，这表明栉齿鼠亚科源自与 Proscirus 有关的一组栉齿鼠，就像其他先进的栉齿鼠啮齿动物一样。这为栉齿鼠亚科的古生物地理学提供了新的认识。
