Herbaceous eudicot Fairlingtonia from the Lower Cretaceous of Jiuquan Basin,Northwest China and its radiation in Laurasia  

作　　者：Bao-Xia Du Ming-Zhen Zhang Jing Zhang Ai-Jing Li Shao-Hua Lin Guo-Rong Ma Jian-Guo Hui 

机构地区：[1]Key Laboratory of Mineral Resources in Western China,Gansu Province,Lanzhou University,Lanzhou 730000,China [2]Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]Key Laboratory of Petroleum Resources,Gansu Province,Lanzhou 730000,China

出　　处：《Journal of Systematics and Evolution》2023年第6期1065-1078,共14页植物分类学报（英文版）

基　　金：supported by the National Natural Science Foundation of China Grants(42072014 and 42272029);the Fundamental Research Funds for the Central Universities(lzujbky-2022-ey18);the National Second Tibetan Plateau Scientific Expedition and Research Grant(2019QZKK0704).

摘　　要：Eudicots exhibit diverse life forms and occupy a wide variety of habitats in the modern terrestrial ecosystems,and the diversification began during the Early Cretaceous;however,few Early Cretaceous fossils are preserved as multiorgan whole plants that can provide sufficient morphological characters for detailed phylogenetic assessment.Here,Fairlingtonia microgyna sp.nov.is reported from the upper Lower Cretaceous of Zhonggou Formation,Hanxia Section,Yumen City,western Gansu Province,Northwest China.The specimen is exceptionally preserved as multiorgan whole plant fossil with fibrous adventitious roots,simple and deeply dissected leaves,solitary and dehiscent capsular fruits attached to the creeping stems.As such,it was interpreted as a herbaceous eudicot.Phylogenetic analyses support a placement within the Papaveraceae,most likely in Papaveroideae,but there are obvious differences in morphological characteristics,which cannot confirm the systematic position within the Papaveraceae.Fossil records of Fairlingtonia from contemporaneous deposits(late Aptian to early Albian)in Northwest China and eastern North America provide direct evidence of the geographical radiation of Fairlingtonia on Laurasia.And the morphological characters of F.microgyna,including creeping leafy branches,fibrous adventitious roots,small and deeply dissected leaves as well as small capsular fruits with tiny seeds probably indicate that it was a colonizer of lake-shore environments under wet and bright conditions and possessed fast-growing and rapid propagation habitats,which allowed it to expand its geographic range with both sexual and asexual reproduction.

关 键 词：Fairlingtonia late Early Cretaceous LAURASIA Northwest China RADIATION 

分 类 号：Q94[生物学—植物学]