Brachypotherium perimense (Perissodactyla, Rhinocerotidae) from the Miocene of Nakhon Ratchasima, Northeastern Thailand, with comments on fossil records of Brachypotherium
Brachypotherium perimense (Perissodactyla, Rhinocerotidae) from the Miocene of Nakhon Ratchasima, Northeastern Thailand, with comments on fossil records of Brachypotherium
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DOI：
10.1080/08912963.2020.1723578
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发表时间：
2020-02
影响因子：
1.4
通讯作者：
Naoto Handa;Y. Nishioka;J. Duangkrayom;Pratueng Jintasakul
中科院分区：
文献类型：
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作者：
Naoto Handa;Y. Nishioka;J. Duangkrayom;Pratueng Jintasakul
摘要：从 2 号沙坑采集到的犀科动物颅齿和颅后遗骸。这项研究描述了泰国东北部呵叻府的 8 个事件。这些遗骸显示出颊壁往往平坦的颊齿、颊舌宽的磨牙状前臼齿，带有短钩针和短足肢骨，表明这些遗骸属于短齿兽属。与非洲-欧亚短齿象相比，这些遗骸被鉴定为南亚物种，即短齿象。结果表明，B. perimense 在晚中新世分布于东南亚。非洲-欧亚大陆的短齿象化石记录表明，早中新世短齿象属就已经存在于印度次大陆。在早中新世晚期和中中新世期间，该属在非洲-欧亚大陆广泛分布并多样化。在中新世末期灭绝之前，其多样性似乎已经减少，只有非洲物种刘易斯（B. lewisi）幸存。
ABSTRACT The cranio-dental and postcranial remains of the Rhinocerotidae collected from the sand pit no. 8 at Nakhon Ratchasima in northeastern Thailand, are described in this study. The remains show cheek teeth that tend to have flattened buccal walls, bucco-lingually broad molariform premolars with short crochet, and brachypodal limb bones, suggesting that these remains belong to genus Brachypotherium. Compared with Afro-Eurasian Brachypotherium, the remains are identified as a South Asian species, Brachypotherium perimense. The result reveals that B. perimense was distributed in Southeast Asia during the Late Miocene. The fossil records of Brachypotherium in Afro-Eurasia show that the genus Brachypotherium was already present in the Indian Subcontinent by the earliest Miocene. This genus then became widely distributed and diversified in Afro-Eurasia during the late Early Miocene and Middle Miocene. Its diversity seems to have decreased before it became extinct by the end of the Miocene, with only the African species, B. lewisi, surviving.