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.
The research was supported by projects of State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of geology and Palaeontology, Chinese Academy of Science) (Grant No. Y626040108) and Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB26000000). This is a contribution to UNESCO-IUGS IGCP Project 679.
Conflicts of Interest
The authors declare no conflicts of interest regarding the publication of this paper.
Cite this paper
Li, C.X. and Zhang, L.B. (2019) Diversification of Eupolypods in Mid-Cretaceous—Evidenced by Myanmar Amber Forest. Open Journal of Geology, 9, 726-730. https://doi.org/10.4236/ojg.2019.910086
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