First record of Cricetops rodent in the Oligocene of southwestern China
First record of Cricetops rodent in the Oligocene of southwestern China
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DOI：
10.1080/08912963.2016.1196686
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发表时间：
2017-05
影响因子：
1.4
通讯作者：
Lüzhou Li;Xijun Ni;Xiaoyu Lu;Qiang-Bing Li
中科院分区：
文献类型：
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作者：
Lüzhou Li;Xijun Ni;Xiaoyu Lu;Qiang-Bing Li
摘要 鼠类仓鼠 Matthew and Granger, 1923 常见于中亚和北亚的渐新世陆地沉积物中。在这里，我们报告了亚洲南部首次发现的仓鼠记录。孤立的啮齿动物磨牙被命名为新物种，Crictops auster sp。 11月，是在中国西南部云南省李家洼地区早渐新世沉积物中发现的。与之前已知的仓鼠相比，C. auster 比仓鼠 Matthew 和 Granger, 1923 和仓鼠 aeneus Shevyreva, 1965 小，但比小仓鼠 Wang, 1987 大。 C. auster 的尖头不太圆锥形。山脊和波峰更长、更高、更厚。新物种中相对较长且较高的波峰、脊和臂从主尖延伸出来，使得这些尖在外观上比 C. dormitor、C. aeneus 和 C. minor 更呈新月形。 C. auster 是李家洼哺乳动物群中的稀有物种。 C. auster 发育良好的剪牙冠和脊可能表明其饮食与亚洲北部的仓鼠不同。
Abstract The muroid Cricetops Matthew and Granger, 1923 commonly occurred in the Oligocene terrestrial deposits in central and northern Asia. Here we report the first record of Cricetops in the southern part of Asia. Isolated rodent molars named as a new species, Cricetops auster sp. nov., were discovered from the early Oligocene sediments at the Lijiawa locality in Yunnan Province in southwestern China. Compared to previously known Cricetops, C. auster is smaller than Cricetops dormitor Matthew and Granger, 1923 and Cricetops aeneus Shevyreva, 1965, but larger than Cricetops minor Wang, 1987. The cusps of C. auster are less conical. The ridges and crests are longer, higher and thicker. Relatively long and high crests, ridges and arms extending from the main cusps in the new species make those cusps more crescent in appearance than in C. dormitor, C. aeneus and C. minor. C. auster is a rare species in the Lijiawa mammalian fauna. Well-developed shearing tooth crests and ridges of C. auster probably suggest a different diet from the Cricetops from the northern part of Asia.