Sigillarian strobili are the reproductive organs correlated with Sigillaria Brongniart, a fossil genus of arborescent lycophyte that dominated the Permo-Carboniferous Euramerican and Cathaysian swamps.On the bases of various types of preservation or different type of megaspores they produced, these strobili have been attributed to three genera, namely, Sigillariostrobus, Mazocarpon and Nudasporestrobus, which all are monosporangiate.Here we present a preliminary study of biosporangiate sigillarian strobili from the Asselian Wuda Tuff Flora in the Wuda Coalfield of Inner Mongolia.A whole crown of Sigillaria cf.S.ichytholepis was found within an area of two square meters, consisting of broken stem, linear leaves and a dozen of strobili radially spread out.Cylindrical bisporangiate strobilus with a slender peduncle, sporophylls arranged in a narrow spiral pattern, and often appearing as an alternatingly whorled pattern.Megasporangia located on the lower part of strobilus whereas microsporangia present on the upper part.Dozens of laevigate megaspores 500 um in diameter, fully filled megasporangia.Subcircular microspores are trilete, spinose, 30-50 um in diameter.The current specimens show great differences from our conventional knowledge about Sigillarian strobili by the bisexual nature of strobili and quantity of megaspores.It enlightens us a further investigation on reproductive strategy of this new type of strobili and the systematics of Sigillaria.
类型: 国际会议
作者: Shan WAN,Jun WANG
来源: 第一届亚洲古生物学大会—暨中国古生物学会成立90周年纪念 2019-11-17
年度: 2019
分类: 基础科学
专业: 生物学,地质学
单位: Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironemnt, Chinese Academy of SciencesUniversity of Science and Technology of China
分类号: Q914
页码: 68
总页数: 1
文件大小: 224k
下载量: 1
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