Heinrichsia cheilanthoides gen. et sp. nov., a fossil fern in the family Pteridaceae (Polypodiales) from the Cretaceous amber forests of Myanmar  

作　　者：Ledis Regalado Alexander R. Schmidt Patrick Muller Lisa Niedermeier Michael Krings Harald Schneider 

机构地区：[1]Institute of Ecology and Systematics, Varona 11835, 11900 Havana, Cuba [2]Department of Geobiology, University of Gttingen, Goldschmidtstrae 3, 37077 Gttingen, Germany [3]Amber Study Group, c/o Geological‐Palaeontological Museum (CeNak) of the University of Hamburg, BundesstraBe 55, 20146 Hamburg, Germany [4]School of Life Sciences, Technical University of Munich, Weihenstephan, Alte Akademie 8, 85354 Freising, Germany [5]SNSB‐Bavarian State Collection for Palaeontology and Geology, Richard‐Wagner‐Strae 10, 80333 Munich, Germany [6]Department of Earth and Environmental Sciences, Ludwig Maximilians University, Richard‐Wagner‐StraBe 10, 80333 Munich, Germany [7]Center of Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Menglun 666303, Yunnan, China

出　　处：《Journal of Systematics and Evolution》2019年第4期329-338,共10页植物分类学报（英文版）

摘　　要：Divergence time estimates suggest that most clades constituting the fern family Pteridaceae (Polypodiales) were in existence by the Early Cretaceous. However, fossil evidence to corroborate this remains exceedingly rare. Burmese amber is an important source of new information on the radiation of derived fern lineages during the Cretaceous Terrestrial Revolution. This study describes Heinrichsia cheilanthoides gen. et sp. nov., a fern with suggested affinities to Pteridaceae, based on fertile foliage portions preserved in Early Cretaceous (~100?Ma) amber from Myanmar. Heinrichsia cheilanthoides is characterized by a pinnate‐pinnatifid frond that bears apical, marginal sori protected by a pseudoindusium. Sporangia are of the polypod type and contain tetrahedral‐globose, trilete spores with a striate perine. This discovery provides a new calibration point to test and refine molecular clock‐based concepts of the evolutionary history of the Pteridaceae. Heinrichsia cheilanthoides further substantiates the suggestion that the Cretaceous forests of Myanmar were home to a rich fern flora.

关 键 词：BURMESE AMBER leptosporangiate FERNS MESOZOIC molecular clock estimate seed-free land plants 

分 类 号：Q[生物学]