1 School of Resources and Civil Engineering, Suzhou University,Anhui Suzhou 234000,China; 2 School of Earth and Space Sciences,Peking University,Beijing 100871, China; 3 Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China
Abstract：Zosterophyllum is one of the representative taxa of early land plants,and has a worldwide distribution. Z. australianum occurred in South China and Australia,and is a typical species of the Northeastern Gondwana Phytogeographic Unit. New material of Z.australianum from the Mangshan Group of the Baoyang section in Duyun,Guizhou is described here. The plant is characterized by sporangia with a short stalk,which are closely arranged forming a spike,and the sporangia are elliptical or fan-shaped,ca. 2.6~4.1 mm wide and up to 3.9 mm high,and the thickened border is ca. 0.6 mm wide. These features are closely comparable to those of Z. australianum from the Early Devonian Posongchong flora of Wenshan,Yunnan. On the basis of the temporal range of Z. australianum and other plants such as Adoketophyton subverticillatum from the Mangshan Group,the lower part of this group is suggested to be the Pragian of the Early Devonian in age. The discovery of Z. australianum from the Mangshan Group extends the geographic distribution of this species,and adds evidence to a certain relationship between the plant assemblages from the Mangshan Group and the Posongchong flora.
Zhou Zhi-Qiang,Zhao Jing-Yu,Wang Jia-Shu et al. New material of Zosterophyllum australianum from the Lower Devonian Mangshan Group in Duyun, Guizhou and its palaeogeographic implications[J]. JOPC, 2022, 24(3): 479-492.
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