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Inferring eupolypods Divergence Time Using Bayesian Tip-Dating

Open Journal of Geology 2024年第2期14卷 247-258页

作者： Yiran Wang Chunxiang Li Key Laboratory of Palaeobiology and Petroleum Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences (NIGPAS) Nanjing China School of Resources and Earth Sciences China University of Mining and Technology Xuzhou China Department of Cenozoic Biological Evolution and Environment NIGPAS Nanjing China

According to the most recent Pteridophyte Phylogeny Group (PPG), eupolypods, or eupolypod ferns, are the most differentiated and diversified of all major lineages of ferns, accounting for more than half of extant fern diversity. However, the evolutionary history of eupolypods remains incompletely understood, and conflicting ideas and scenarios exist in the literature about many aspects of this history. Due to a scarce fossil record, the diversification time of eupolypods mainly inferred from molecular dating approaches. Currently, there are two molecular dating results: the diversification of eupolypods occurred either in the Late Cretaceous or as early as in the Jurassic. This study uses the Bayesian tip-dating approach for the first time to infer the diversification time for eupolypods. Our analyses support the Jurassic diversification for eupolypods. The age estimations for the diversifications of the whole clade and one of its two subclades (the eupolypods II) are both in the Jurassic, which adds to the growing body of data on a much earlier diversification of Polypodiales in the Mesozoic than previously suspected.

关键词： eupolypods Mid-Cretaceous Fossils Bayesian Tip-Dating

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Diversification of eupolypods in Mid-Cretaceous—Evidenced by Myanmar Amber Forest

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Open Journal of Geology 2019年第10期9卷 726-730页

作者： Cunxiang Li Libing Zhang State Key Laboratory of Palaeobiology and Stratigraphy Center for Excellence in Life and Palaeoenvironment Nanjing Institute of Geology and Palaeontology Nanjing China Missouri Botanical Garden St. Louis Missouri USA Chengdu Institute of Biology Chinese Academy of Sciences Chengdu China

The evolutionary history of eupolypods still remains unclear, especially on its diversification scenarios. In recent years, it has been found that approximately 100 million-year-old Myanmar amber provides a unique source of polypod fossils. Different families and numerous sporangia, spores, and scales have been found in Myanmar amber. These discoveries are nevertheless important because they provided the first unequivocal fossil evidence that the diversity of eupolypod ferns was present already in the mid-Cretaceous Myanmar amber forest. This clearly shows that eupolypods originated before mid-Cretaceous, probably as early as the Early Jurassic, which is consistent with the recent divergence time estimate based on molecular dating.

关键词： Mid-Cretaceous Myanmar Amber eupolypods Divergence Time

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