New Eocene fossil fruits and leaves of Menispermaceae from the central Tibetan Plateau and their biogeographic implications  

作　　者：Cédric Del Rio Jian Huang Ping Liu Wei-Yu-Dong Deng Teresa E.V.Spicer Fei-Xiang Wu Zhe-Kun Zhou Tao Su 

机构地区：[1]CAS Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla 666303,Yunnan,China [2]Center of Plant Ecology,Core Botanical Gardens,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla 666303,Yunnan,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Key Laboratory of Vertebrate Evolution and Human Origins,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China [5]Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Beijing 100101,China [6]Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650204,China

出　　处：《Journal of Systematics and Evolution》2021年第6期1287-1306,共20页植物分类学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Nos.41922010,41988101,31800183);a joint research program of NSFC and NERC(Natural Environment Research Council of the UK)(Nos.41661134049,NE/P013805/1);a post-doctoral fellowship from XTBG;the Strategic Priority Research Program of the Chinese Academy of Sciences(CAS)(Nos.XDA20070301 and XDB26000000);the Second Tibetan Plateau Scientific Expedition(No.2019QZKK0705)program;the Key Research Program of Frontier Sciences,CAS(No.QYZDB-SSW-SMC016);the Youth Innovation Promotion Association,CAS(Nos.2017103,2017439);and the CAS 135 program(No.2017XTBG-F01);Yunnan Basic Research Projects(No.2019FB026);Chinese Academy of Sciences(CAS)“Light of West China”Program.

摘　　要：Menispermaceae are a pantropical and temperate family with an extensive fossil record during the Paleogene period,especially in North America and Europe,but with much less evidence from Asia.The latest fossil evidence indicates a succession of tropical to subtropical flora on the central Tibetan Plateau during the Paleogene.However,the biogeographic histories of these floras are still unresolved.Here,we report on endocarps and leaves of Menispermaceae from the Middle Eocene of Jianglang village,Bangor County,central Tibetan Plateau.The endocarps belong to two genera:Stephania,which is characterized by a horseshoe-shaped endocarp and with one lateral crest ornamented by spiny to rectangular ribs,and a condyle area;and Cissampelos(s.l.),which has two characteristic lateral ridges and a conspicuous external condyle.Associated leaves belong to the genus Menispermites,and are characterized by actinodromous primary venation,brochidodromous secondary veins,entire margins,and the presence of marginal secondary veins.The biogeographic history of Menispermaceae is complex,but evidence from these new fossils indicates an early diversification of the group in Asia,probably in response to the warming climate during the Eocene.The Jianglang flora appears to be part of a boreotropical flora,connecting Asia with North American and European floras during the Middle Eocene.The modern distribution of menispermaceous taxa found in Jianglang,as well as other families represented in the Jianglang flora,show that a tropical to subtropical climate occurred during the Eocene in central Tibet.

关 键 词：ENDOCARP fossil plant leaf PALEOBOTANY Tibetan Plateau 

分 类 号：Q15[生物学—普通生物学]