There is a rapid evolution of global organisms in the late Ediacaran, especially Cloudina, the earliest and widely distributed mineralized skeletal organism in the world, indicating that the early biological evolution has entered a new era,. Cloudina is considered to be an important index fossil of the terminal Ediacaran. The Gaojiashan Lagerst?tte, located in the Northwestern of the Yangtze Plat, contains a great diversity of well-preserved phosphatized Cloudina, which was supposed to be the index fossil of the terminal Ediacaran. Pyritized Conotubus was one of the highly representative fossil preserved in the Gaojiashan Lagerst?tte. The internal structure also could be distinguished with the help of industrial computerized tomography（CT） technique. Furthermore, pyritized Conotubus was also discovered in Esmeralda section of Deep Spring Formation, Nevada, USA, suggesting that Conotubus distributed extensively. Previous researchers compared the morphology of Conotubus and Cloudina, and considered that Conotubus has a close affinity to Cloudina. Recently, the CT technology, which was nondestructive testing technology to samples, was used to explore the growth characteristics of Conotubus. The CT results showed delicate details and intact morphology of Conotubus. It is generally assumed that Conotubus and Cloudina budding from the sicula. Therefore, in this thesis, 26 Cloudina sicula and 21 Conotubus sicula were chosen as the research object for geometric morphological analysis. Two landmarks were demarcated at the tubular fossil’s orifice, besides, 20 and 5 semilandmarks were demarcated in the fossil body part. The results showed that there was no significant difference between Conotubus and Cloudina, which means Conotubus and Cloudina have similar budding reproduction pattern. The Gaojiashan Lagerst?tte, where the strata deposited conformed, contains continually evolving fossils in the late Ediacaran help to explore the evolutionary mechanism of nature. Meanwhile, the geometric morphometrics result of Conotubus and Cloudina provide a strong support for Gaojiashan Lagerst?tte to apply the GSSP.
类型: 国际会议
作者: LUO Jingzhou,LIU Ziwei,REN Jinjie,ZHAO Wenyu,CHAI Shu,CUI Zaihang,DAI Qiaokun,HUA Hong
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学
专业: 生物学,地质学
单位: Early life institute, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University
分类号: Q914
DOI: 10.26914/c.cnkihy.2019.028433
页码: 277-278
总页数: 2
文件大小: 186k
下载量: 5
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