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

• 作者: Cunxiang Li Libing Zhang
• 来源期刊: 地质学期刊(英文)
• 学科: 医学
• 关键词: MID-CRETACEOUS Myanmar AMBER Eupolypods DIVERGENCE TIME
• 年，卷（期）: 2019,（10）
• 页码范围: 726-730
• 页数: 5页
• 分类号: R73

摘要

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.