Bovidae (Mammalia, Artiodactyla) from the Neogene Irrawaddy beds, Myanmar
Bovidae (Mammalia, Artiodactyla) from the Neogene Irrawaddy beds, Myanmar
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DOI：
10.1127/pala/2019/0088
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
Y. Nishioka;M. Takai;T. Tsubamoto;N. Egi;Takeshi Nishimura;Reiko T. Kono;Shinkai Ogino;Thaung-Htike;Zin-Maung-Maung-Thein-Zin-Maung-Maung-Thein-1402677736;C. Vidthayanon
中科院分区：
文献类型：
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作者：
Y. Nishioka;M. Takai;T. Tsubamoto;N. Egi;Takeshi Nishimura;Reiko T. Kono;Shinkai Ogino;Thaung-Htike;Zin-Maung-Maung-Thein-Zin-Maung-Maung-Thein-1402677736;C. Vidthayanon
研究了缅甸中部新近纪牛科动物（哺乳动物、偶蹄目、反刍动物）的演化，描述了伊洛瓦底江地层中新世晚期至上新世部分的山羊和牛科动物新标本。缅甸中部中新世晚期早期牛科动物的多样性较低，以Helicoportax sp.和Selenoportax vexillarius为代表。此后，他们迅速多样化，直到最近的中新世（c。6 Ma），包括山羊属（Caprinae gen. et sp. indet.）有螺旋角的核心和七个牛-Sivaportax dolabella，Tragoportax sp.，Selenoportax vexillarius、Selenoportax falconeri、Pachyportax latidens、Pachyportax lasteus和Proleptobos birmanicus。最新的中新世/上新世早期牛科动物的特征是Irrawaddy特有种（Sivaportax dolabella和Proleptobos birmanicus）和其他属/种与印度-巴基斯坦的Siwaliks的Nagri/Dhok Pathan动物群（Tra-goportax，Selenoportax vexillarius，Selenoportax falconeri，Pachyportax latidens和Pachyportax latteus）共存。其中，只有特有种在上新世存活了下来。伊洛瓦底江地层上部（上新世晚期）发现的Duboisia（印度尼西亚爪哇更新世牛科动物）也支持了东南亚特有物种的优势地位。通过晚第三纪，没有典型的动物区系的周转证明在伊洛瓦底江牛科动物与西瓦利克牛科动物。这一相对较低的更替率可能受到上新世晚期缅甸中部与印度-巴基斯坦动物区系隔离进展的影响，这是由于缅甸中部与南亚之间形成了地理屏障。
The evolution of the Neogene bovids (Mammalia, Artiodactyla, Ruminantia) in central Myanmar was examined, with descriptions of new specimens of caprine and bovine bovids from the upper Miocene to Pliocene part of the Irrawaddy beds. In the early late Miocene of central Myanmar, bovids had a relatively low diversity and were represented by Helicoportax sp. and Selenoportax vexillarius. Thereafter, they rapidly diversified until the latest Miocene (c. 6 Ma), including a caprine species (Caprinae gen. et sp. indet.) with spiral horn cores and seven bovines–Sivaportax dolabella, Tragoportax sp., Selenoportax vexillarius, Selenoportax falconeri, Pachyportax latidens, Pachyportax giganteus, and Proleptobos birmanicus. The latest Miocene/early Pliocene bovids are characterised by the coexistence of the Irrawaddy-endemic species (Sivaportax dolabella and Proleptobos birmanicus) and the other genera/species shared with the Nagri/Dhok Pathan faunas of the Siwaliks of Indo-Pakistan (Tra-goportax, Selenoportax vexillarius, Selenoportax falconeri, Pachyportax latidens, and Pachyportax giganteus). Among them, only the endemic species had survived throughout the Pliocene. The occurrence of Duboisia (Pleistocene bovids in Java, Indonesia) from the upper part (upper Pliocene) of the Irrawaddy beds also supports the dominance of endemic species in Southeast Asia. Through the late Neogene, no typical faunal turnovers were demonstrated in the Irrawaddy bovids with respect to those in the Siwalik bovids. This relatively low turnover rate was possibly affected by the progress in the faunal isolation of central Myanmar from the fauna of Indo-Pakistan during the late Pliocene owing to the formation of biogeographical barriers between central Myanmar and South Asia.