Middle Eocene ungulate mammals from Myanmar: a review with description of new specimens
Middle Eocene ungulate mammals from Myanmar: a review with description of new specimens
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发表时间：
2005
影响因子：
1.8
通讯作者：
T. Tsubamoto;N. Egi;M. Takai;C. Sein;Maung Maung-Maung
中科院分区：
文献类型：
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作者：
T. Tsubamoto;N. Egi;M. Takai;C. Sein;Maung Maung-Maung
我们回顾了缅甸中部始新世庞当组的有蹄类哺乳动物动物群，并在此描述了新的牙齿标本。在 Pondaung 地层中新确认的类群是两个不确定的布诺龙偶蹄类、两个小型“eomoropid”奇蹄类（Eomoropus sp. cf. E. minimus 和一个不确定的“eomoropid”），以及一个新的 deperetellid 奇蹄类属，Bahinolophus，它是为 Pondaung 地层的 Deperetella birmanica 建立的。编队。 Pondaung 有蹄类动物群由 29 种（14 科 18 属）组成：一种不确定的小型有蹄类动物、12 种偶蹄类（6 科 6 属）和 16 种（7 科 11 属）奇蹄类动物。尽管庞当偶蹄类动物和奇蹄类动物数量丰富且分类多样，但前者在属数上不如后者多样化，但在数量上几乎与后者相当。炭疽兽科偶蹄目、雷兽科和无齿兽科奇蹄目是动物群中最丰富的成分。所包括的类群的估计古生态、地质和地理证据以及细胞图分析表明，Pondaung 动物群的古环境是森林/林地植被，具有潮湿/半湿润的湿度和大河流，距离特提斯海东部不远。仅根据地层、微化石和辐射证据，Pondaung 动物群的年龄与最晚始新世中期独立相关，得出与哺乳动物动物群相关性一致的结果。另一方面，与东亚其他中始新世动物群相比，Pondaung 动物群包括许多偶蹄类群，并且在属水平上表现出相对较高的特有性，这意味着 Pondaung 动物群并未正式纳入始新世亚洲陆地哺乳动物“年龄”系统。
We review an ungulate mammalian fauna of the Eocene Pondaung Formation, central Myanmar, and herein describe new dental specimens. The taxa newly recognized in the Pondaung Formation are two indeterminate bunodont artio− dactyls, two small “eomoropid” perissodactyls (Eomoropus sp. cf. E. minimus and an indeterminate “eomoropid”), and a new deperetellid perissodactyl genus, Bahinolophus, which is established for Deperetella birmanica from the Pondaung Formation. The Pondaung ungulate fauna consists of 29 species (14 families and 18 genera): one species of an indeterminate small ungulate, 12 species (six genera in six families) of artiodactyls, and 16 species (11 genera in seven families) of perissodactyls. Although both Pondaung artiodactyls and perissodactyls are abundant and taxonomi− cally diverse, the former are less diversified in generic numbers than the latter, but are nearly equal to the latter in abun− dance. Anthracotheriid artiodactyls and brontotheriid and amynodontid perissodactyls are the most abundant elements in the fauna. The estimated paleoecologies of the included taxa, the geologic and geographic evidence, and cenogram analysis suggest that the paleoenvironment of the Pondaung fauna was forested/woodland vegetation with humid/sub− humid moisture and large rivers, which were located not far from the eastern Tethyan Sea. The age of the Pondaung fauna is independently correlated with the latest middle Eocene only on the basis of the stratigraphic, microfossil, and radiometric evidence, yielding a result consistent with mammalian faunal correlations. On the other hand, the Pondaung fauna includes many artiodactyl taxa compared to other middle Eocene faunas of East Asia and shows rela− tively high endemism at the generic level, implying that the Pondaung fauna is not formally included in the Eocene Asian Land Mammal “Ages” system.