New Cricetid Rodents from Strata near the Eocene-Oligocene Boundary in Erden Obo Section (Nei Mongol, China).
New Cricetid Rodents from Strata near the Eocene-Oligocene Boundary in Erden Obo Section (Nei Mongol, China).
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额尔登鄂博剖面始新世-渐新世边界附近地层中发现的新仓鼠类啮齿类动物（中国内蒙古）
DOI：
10.1371/journal.pone.0156233
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Li Q;Meng J;Wang Y
内蒙古额额登鄂博剖面“上红”层中下部报道了新蟋蟀（Eucricetodon wangae sp. nov.、Eucricetodon sp.和Pappocricetodon siziwangqiensis sp. nov.）。王氏Eucricetodon wangae在亚洲和欧洲的下渐新世具有单一的前锥体、原锥体和副锥体之间的单一连接、M1-2的前孔连接和较弱的下磨牙前锥体和外孔连接，比其他已知属的物种更原始。Pappocricetodon siziwangqiensis在永久缺失的P4中比其他属的物种更先进，具有后原孔连接。这些化石表明额尔登鄂博剖面“上红”的年龄比始新统上霍尔德金组和蔡家冲组的年龄要年轻，但比包含山戈良动物群的年龄要老；“上红”层在年龄上与鄂连层关系最为密切，可能接近始新世/渐新世界线。根据年龄估计，王氏Eucricetodon wangae提供了新的证据，支持蟋蟀从亚洲到欧洲的传播发生在始新世-渐新世边界之前。
New cricetids (Eucricetodon wangae sp. nov., Eucricetodon sp. and Pappocricetodon siziwangqiensis sp. nov.) are reported from the lower and middle parts of the “Upper Red” beds of the Erden Obo section in Nei Mongol, China. Eucricetodon wangae is more primitive than other known species of the genus from lower Oligocene of Asia and Europe in having a single anterocone on M1, a single connection between the protocone and the paracone, the anterior metalophule connection in M1-2 and weaker anteroconid and ectomesolophid in lower molars. Pappocricetodon siziwangqiensis is more advanced than other species of the genus in permanently missing P4 and having posterior protolophule connection. These fossils suggest that the age of the “Upper Red” of the Erden Obo section is younger than the age of the Upper Eocene Houldjin and Caijiachong formations, but older than those containing the Shandgolian faunas; the “Upper Red” is most closely correlative to the Ergilian beds in age, and probably close to the Eocene/Oligocene boundary. Given the age estimate, Eucricetodon wangae provides the new evidence to support that cricetid dispersal from Asia to Europe occurred prior to the Eocene-Oligocene boundary.