New Benthic Fossils from the Late Ediacaran Strata of Southwestern China  

作　　者：LIU Junping LI Ming TANG Feng ZHAO Jiangtai SONG Sicun ZHOU Ying SONG Xiaohan REN Liudong 

机构地区：[1]School of Earth Science and Resources,China University of Geosciences,Beijing 10083,China [2]Yunnan Institute of Geological Survey,Kunming 650216,China [3]Chinese Academy of Geological Sciences,Beijing 10037,China [4]Key Laboratory for Stratigraphy and Paleontology,MNRC,Beijing 10037,China [5]School of Earth Science and Engineering,Nanjing University,Nanjing 210093,China [6]Department of Earth Sciences,University College London,London WC1E 6BT,U.K. [7]CAS and Shandong Province Key Laboratory of Experimental Marine Biology,Center for Ocean Mega-Science,Institute of Oceanology,Chinese Academy of Sciences,Qingdao,Shandong 266071,China [8]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 10037,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第2期311-323,共13页地质学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42172035,42062005 and 41572024);the China Geological Survey(Grant No.DD20221648);Yunnan Province Science and Technology Department(Grant No.202305AD160031,202401AT070012);the project entitled 1:50000 Regional Geological Survey of Dazhuang,Fabiao,Ditu,and Dianzhong Sheets in Yunnan Province(Grant No.D202207).

摘　　要：The Jiangchuan Biota from the Jiucheng Member(Mb.)of the Dengying Formation(Fm.),discovered in Jiangchuan,eastern Yunnan,China,is marked by copious macrofossils at the apex of the Ediacaran strata.This fauna features benthic algae with varied holdfasts and other fossils of indeterminate taxonomic affinity and is compositionally unique compared to the Shibantan and Gaojiashan biotas of the Dengying Fm.and the Miaohe and Wenghui biotas of the Doushantuo Fm.,elsewhere in China.One novel benthic saccular macroalgal fossil,named here Houjiashania yuxiensis gen.and sp.nov.,from the Jiangchuan Biota is based on fossils that are sausage-shaped,elongate,tubular,ranging from 0.3 to 4 cm in length,and up to 0.8 cm in diameter.One terminus is blunt and rounded to an obtuse angle,the other is bent with a spread-out surface resembling a holdfast,suggesting a three-dimensional thallus.Thin,stipe-shaped outgrowths,likely vestiges of sessile saccular life forms,are prevalent in macroalgal fossils of analogous size and shape,as well as present brown algae Scytosiphonaceae,such as Colpomenia and Dactylosiphon.The new findings augment the diversity of benthic algae,such as those known from the Early Neoproterozoic Longfengshan Biota in North China.The benthic algal macrofossils in the Jiucheng Mb.add to knowledge of Late Ediacaran metaphyte diversification and offer more clues about the evolutionary positioning of primitive macroalgae.The co-occurrence of numerous planktonic and benthic multicellular algae and planktonic microbes might have facilitated ecologically the more extensive later Cambrian explosion evidenced by the Chengjiang Biota in Yunnan.

关 键 词：paleophytology benthic saccular algae algal evolution NEOPROTEROZOIC Jiucheng Member Jiangchuan Biota Yunnan Province 

分 类 号：Q915.2[天文地球—古生物学与地层学] P535[生物学—古生物学]