Morphological reconstruction of the Ediacaran macroalga Gesinella from South China  

作　　者：Yu-Lan Li Feng Tang Ye Wang Ji Li Ming-Sheng Zhao Jun-Ling Liao Yue Wang 

机构地区：[1]College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,Guizhou Province,China [2]Guizhou Bureau of Geology and Mineral Resources,111 Geological Brigade,Guiyang 550081,Guizhou Province,China [3]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China [4]College of Paleontology,Shenyang Normal University,Shenyang 110034,Liaoning Province,China

出　　处：《Journal of Palaeogeography》2023年第1期82-95,共14页古地理学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.41762001 and 42172035);the Science and Technology Project of Guizhou Province,China(Grant No.2021-4001);the China Geological Survey(compilation of international geomaps through cooperation of China,Russia and Mongolia,DD20221648).

摘　　要：Macroalga Gesinella,a carbonaceous compression,is found in the upper part of Doushantuo Formation(Ediacaran)in the Yangtze Platform of South China.Morphologically,it is composed of a thallus(including an oval or oblong lamina and a short-rod-like stipe)and a holdfast(including a cone-shaped rhizome and many filamentous rhizoids).The cone-shaped rhizome connects with the stipe and the long rhizoids grew on the rhizome,meaning that the rhizome grew downwards and inserted into the sediment,while the rhizoids grew in the gaps between the sediment grains to anchor its body on the seafloor.On the lamina,branching and/or unbranching filaments are regularly distributed,so that the oval or oblong lamina can be interpreted as a sac-like body that has been compressed.The filaments on the lamina extend from the three-dimensionally preserved stipe,suggesting that the short-rod-like stipe may have been flexible to support the sac-like body in the water column.With tissue and organ differentiations,Gesinella can be regarded as a eukaryotic macroalga and a high-level metaphyte.Based on measurement and analysis of 108 specimens,the Ediacaran macroalga Gesinella from South China can be divided into three stages:juvenile stage(<3 mm maximum width)identified with difficulty,adult stage(3e10 mm maximum width)interpreted to have grown upwards for sunlight,and senescent stage(>10 mm maximum width)that grew sideways.

关 键 词：THALLUS HOLDFAST FILAMENTS EDIACARAN Gesinella South China 

分 类 号：Q914[天文地球—古生物学与地层学]