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首页> 外文期刊>Scientific reports. >A new primate from the late Eocene of Vietnam illuminates unexpected strepsirrhine diversity and evolution in Southeast Asia
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A new primate from the late Eocene of Vietnam illuminates unexpected strepsirrhine diversity and evolution in Southeast Asia

机译：来自越南晚期的新灵长类动物在东南亚阐明了意想不到的Strepsirhine多样性和演变

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摘要

Sivaladapidae is a poorly known Asian strepsirrhine family originally discovered in Miocene sediments of the Indian subcontinent. Subsequent research has considerably increased the diversity, temporal range, and geographical distribution of this group, now documented from China, Thailand, Myanmar, Pakistan, and India and whose earliest representatives date back to the Middle Eocene. We present here a new taxon of sivaladapid from the Na Duong coal mine in the Latest Middle Eocene-Late Eocene of Vietnam. It represents the first Eocene primate from Vietnam and the first medium-sized mammal recovered from this locality, thus documenting a completely new part of the Na Duong paleobiodiversity. This taxon is the largest sivaladapid ever found with an estimated body weight of 5.3?kg and it represents a new subfamily of sivaladapids in exhibiting a very peculiar combination of dental features yet unknown in the fossil record of the family (e.g., retention of four premolars, high-crowned molars with accentuated bunodonty and extreme crest reduction). Besides documenting a complete new part of sivaladapid evolution, its primitive dental formula and derived features shared with the Early Eocene Asiadapidae reinforce the hypothesis of a basal branching of sivaladapids among strepsirrhines.
机译：Sivaladapidae是一个令人着名的亚洲肌肉挑剔的家庭，最初发现在印度次大陆的内科沉积物中。随后的研究大大增加了本集团的多样性，时间范围和地理分布，现已记录在中国，泰国，缅甸，巴基斯坦和印度，其最早代表会返回中间何种。我们在这里在越南最新的中期期神社会中来自Na Duong煤矿的雄鹿adapid的新分类。它代表来自越南的第一个何种期治和从该地区恢复的第一个中型哺乳动物，从而记录了Na Duong古形过世的全新部分。这个分类群是有史以来最大的持续体重5.3克的持久性，它代表了雄鹿adapids的新亚家族，在展示了家庭化石记录中尚不为：牙科特征的非常奇特的组合（例如，保留四个前磨，高冠臼齿，带有突出的BunodoNty和极端嵴减少）。除了记录Sivaladapid Evolution的完整新部分外，其原始牙科公式和与早期的eoceneapdapidae共享的衍生特征加强了串鼠菌中雄牛皮体的基础分枝的假设。

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