Fossil fruits of Koelreuteria (Sapindaceae) from the Miocene of northeastern Tibetan Plateau and their palaeoenvironmental, phytogeographic and phylogenetic implications
Fossil fruits of Koelreuteria (Sapindaceae) from the Miocene of northeastern Tibetan Plateau and their palaeoenvironmental, phytogeographic and phylogenetic implications
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DOI：
10.1016/j.revpalbo.2016.09.002
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发表时间：
2016-11-01
影响因子：
1.9
通讯作者：
Guo, Shuangxing
中科院分区：
文献类型：
--
作者：
Li, Xiangchuan;Xiao, Liang;Guo, Shuangxing
Koelreuteria的果实在美国西部、东亚和东欧中部的第三纪沉积物中是众所周知的，但在其他地区的化石记录中，该属的生殖器官仍然很少见。李祥川，肖亮，贺文龙等。这个新种的特点是蒴果开裂，膜质，不对称，呈窄卵形，脉网状，包括近平行的直侧脉，每瓣有一至两个卵球形或椭圆形的种子。其荚膜瓣在大体形态上与分布于东亚的现存K. paniculata Laxmann和来自中东欧的新世-上新世K. macroptera (Kovats) Wilfred Norman Edwards极为相似。该化石记录与其他共生乔木植物（例如：Koelreuteria）的历史分布范围被现在的记录大大扩展到中亚地区，而中亚地区以前是一个缺乏现存和化石记录的地理区域。(C) 2016 Elsevier B.V.版权所有
Fruits of Koelreuteria are well known in the Tertiary deposits of western United States, eastern Asia and Central East Europe, yet unequivocal reproductive organs of this genus from other areas remain rare in the fossil record. Here, a new species Koelreuteria quasipaniculata Xiangchuan Li, Liang Xiao et Wenlong He sp. nov. is recognized from the Early to Middle Miocene Garang Formation of Zeku in northeastern Tibetan Plateau, Central Asia. This new species is characterized by dehiscent, membranous capsules with an asymmetrical, narrowly ovate shape, and reticulate venation including subparallel, straight lateral veins and one to two ovoid or ellipsoidal seeds each valve. Its capsular valves closely resemble those members of the K. paniculata-type group in gross form, i.e. the extant K. paniculata Laxmann distributed in eastern Asia and the Oligocene-Pliocene K. macroptera (Kovats) Wilfred Norman Edwards from Central-East Europe. The newly discovered fossil materials corroborate the occurrence of Koelreuteria in the Tibetan Plateau during the Early to Middle Miocene, and add to the diversity of Koelreuteria in Central-East Asia during the Miocene, which has been well represented from the Cenozoic deposits of the northern hemisphere. This fossil record together with other co-occurring arborescent plants (e.g. Acer, Ulmus and Fraxinus) contributes to our understanding of past vegetation change in the northeastern Tibetan Plateau. Furthermore, the historical distribution range of Koelreuteria is significantly expanded by the present record into Central Asia formerly known as a geographic region lacking extant and fossil records. (C) 2016 Elsevier B.V. All rights reserved.