A new genus of aplodontid rodent (Mammalia, Rodentia) from the late Oligocene of northern Junggar Basin, China.

A new genus of aplodontid rodent (Mammalia, Rodentia) from the late Oligocene of northern Junggar Basin, China.
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DOI:
10.1371/journal.pone.0052625
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Ye J
Ye J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bi S;Meng J;McLean S;Wu W;Ni X;Ye J

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描述了采自中国北方准噶尔盆地晚渐新世的单齿类啮齿动物一新属新种--杜氏原鼠(Proansomys dureensis)。这个新的属被称为Ansomyinae,因为上颊齿的外唇,虽然没有完全冠,但已经达到了与亚科其他成员相同的特征桶柄形配置。它代表了在亚洲发现的亚科的最早记录,并且比Ansomys属的物种更具有近形性,具有部分冠状的外唇,较低程度的lophodonty和较不复杂的齿盆(缺乏附属裂片)。原长吻鼠属具有前松鼠属和长吻鼠属之间的过渡特征,表明长吻鼠亚科与其他高级单齿亚目啮齿动物一样,起源于一组与前松鼠属有关的单齿亚目动物。这为Ansomyinae的古生物地理学提供了新的线索。
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.
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