Oligocene Koelreuteria (Sapindaceae) from the Lunpola Basin in central Tibet and its implication for early diversification of the genus
Oligocene Koelreuteria (Sapindaceae) from the Lunpola Basin in central Tibet and its implication for early diversification of the genus
复制标题
西藏中部伦坡拉盆地的渐新世栾树属（无患子科）及其对该属早期多样化的意义
DOI：
10.1016/j.jseaes.2018.01.014
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发表时间：
2019-05-15
影响因子：
3
通讯作者：
Shi, Gongle
中科院分区：
文献类型：
--
作者：
Jiang, Hui;Su, Tao;Shi, Gongle
化石对于了解青藏高原的隆升历史及其对欧亚大陆生物多样性的影响至关重要。然而，保存完好的化石，特别是植物巨化石在高原上是罕见的。本文描述了栾树属（Koelreuteria）的两个种，即K. lunpolaensissp. nov.和长叶拟谷盗K. miointegrifoliola，基于西藏中部伦坡拉盆地渐新世晚期保存完好的囊瓣。Koelreuteria lunpolaensis与该属所有现存物种和化石物种的区别在于强烈不对称的囊瓣形式，瓣的微缺或裂尖，以及向瓣边缘逐渐变细的锯齿形侧脉，并被认为代表该属的灭绝谱系。Koelreuteria miointegrifoliola与K.现存的栾树属的二回羽状类型群。栾树属植物的现代分布证实了渐新世晚期西藏中部低海拔的温暖湿润环境。化石证据表明，渐新世/中新世青藏高原是栾树属植物多样性和多样化的中心。这也表明，西藏也可能作为一个避难所的K。渐新世晚期为二羽片型群。
Fossils are critical for understanding the uplift history of the Tibetan Plateau and its impact on the diversity and diversification of living organisms in Eurasia. However, well-preserved fossils, especially plant megafossils are rare in the plateau. In this paper, we describe two species of Koelreuteria, namely K. lunpolaensis sp. nov. and K. miointegrifoliola, based on exquisitely preserved capsular valves from the late Oligocene of the Lunpola Basin, central Tibet. Koelreuteria lunpolaensis is distinguishable from all extant and fossil species of the genus in the strongly asymmetric form of the capsular valves, the emarginate or lobed apex of the valves, and zigzag lateral veins that are tapering towards the margin of the valves, and is considered to represent an extinct lineage of the genus. Koelreuteria miointegrifoliola is most similar to K. bipinnata-type group of extant Koelreuteria. The diverse Koelreuteria confirms a warm and humid environment with a low elevation in central Tibet during the late Oligocene based on their modem distributions. Fossil evidence indicates that the Tibetan Plateau was a center for diversity and diversification of Koelreuteria in the Oligocene/Miocene. It also suggests that Tibet might also serve as a refugium for the K. bipinnata-type group in the late Oligocene.