The Chalicotheriidae (Mammalia, Perissodactyla) from the upper Miocene Nakali Formation, Kenya
The Chalicotheriidae (Mammalia, Perissodactyla) from the upper Miocene Nakali Formation, Kenya
复制标题
来自肯尼亚中新世上部纳卡利组的 Chalicotheriidae（哺乳纲、奇蹄目）
DOI：
10.1080/08912963.2021.1876042
复制
发表时间：
2021
影响因子：
1.4
通讯作者：
Nakaya Hideo
中科院分区：
文献类型：
--
作者：
Handa Naoto;Nakatsukasa Masato;Kunimatsu Yutaka;Tsubamoto Takehisa;Nakaya Hideo
描述了肯尼亚中部纳卡利地区上中新统(约10 Ma)纳卡利组中的两颗上臼齿(Mammalia，Perissodactyla)。其中一种被确定为M2。另一种是非常不完整的，暂时指与M2相同的种。M2标本的冠长于宽，高于合欢亚科，属于裂褶亚科。它在形态上与裂殖亚科的晚中新世和上更新世的上磨牙相似，如五齿隐翅虫(Ancylotherium Etelicum)和海南隐翅虫(Ancylotherium Hennigi)。从计量上看，M2在FA的范围内。Petelicum，结果鉴定为Ancylotheriumcf.Petelicum。这一结果表明，该属在非洲的化石记录可以追溯到公元前。10马赫。以前和现在的研究表明，中新世非洲Ancylotherium可能处于森林主导的环境中。非洲和欧亚大陆的钩吻线虫化石记录表明，该属从欧亚大陆向非洲的扩散可能发生在更早的时间。10 Ma，尽管需要更多的非洲化石记录来证实这一点。
Two upper molars of the Chalicotheriidae (Mammalia, Perissodactyla) from the upper Miocene (ca. 10 Ma) Nakali Formation of Nakali, central Kenya, are described. One is identified as M2. The other is very fragmentary and is tentatively referred to the same species as the M2. The M2 specimen is assigned to the subfamily Schizotheriinae in having a crown longer than wide and higher than that of the Chalicotheriinae. It is morphologically similar to upper molars of late Miocene and Plio-Pleistocene species of the Schizotheriinae such asAncylotherium pentelicumandAncylotherium hennigi. Metrically, the M2 is within the range ofA. pentelicum, resulting an identification asAncylotheriumcf.pentelicum. This result suggests that the fossil record of this genus in Africa dates back toca. 10 Ma. Previous and present studies suggest that Miocene AfricanAncylotheriumwould have been in forest-dominated environments. African and Eurasian fossil records ofAncylotheriumsuggest that the dispersal of this genus from Eurasia into Africa would have occurred beforeca. 10 Ma, although more African fossil records are needed to confirm this.