Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - A window into the early eukaryote evolution

doi:10.1016/j.precamres.2017.04.042

	Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - A window into the early eukaryote evolution
	Agic, Heda; Moczydlowska, M (Moczydlowska, Malgorzata); Yin, LM (尹磊明）
	2017
发表期刊	Precambrian Research
ISSN	0301-9268
卷号	297 页码:101-130
摘要	Mesoproterozoic Era was an important time for initial diversification of eukaryotic clades and appearance of the earliest complex cell morphologies. Shales and siltstones of the Ruyang Group, Shanxi Province, North China Craton, record such diverse organic-walled microfossils, in addition to novel morphotypes. Recently, the depositional age of this succession has been constrained to 1744 22 to 1411 27 Ma via zircon U-Pb and Hf isotopic dating. This dating extended back the time of the first appearance of complex eukaryotic characters (e.g. processes, sculpture, layered wall structure) in the fossil record. We have conducted a biostratigraphic investigation of the samples throughout the fossiliferous Ruyang Group to provide an estimate of the relative early eukaryotic diversity in the Mesoproterozoic. Light- and scanning electron microscope observations have documented 26 species, including several that are reported for the first time, and some that were previously known only from younger, Neoproterozoic strata. Diversity was high in the upper Baicaoping Formation, declined in the middle and reached its peak in the upper Beidajian Formation. Novel morphologies among the unicellular Ruyang biota included a variety of processes, from tube-like extensions to hirsute spines, vesicles with velutinous outer membranes, as well as numerous specimens with internal bodies of varying sizes. We have also recorded the globally distributed Mesoproterozoic taxa Dictyosphaera and Tappania, and several morphotypes of Shuiyousphaeridium. Key characters displayed by the Ruyang biota are consistent with reproductive structures (especially cysts) like those among modern protists. These microfossils provided an additional evidence for the ongoing first radiation of Eukarya by at least 1400 Ma. (C) 2017 Elsevier B.V. All rights reserved.
关键词	Mesoproterozoic Ruyang Group Organic-walled microfossils Eukaryotic evolution North China Palaeobiodiversity
DOI	10.1016/j.precamres.2017.04.042
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000404697200006
出版者	ELSEVIER SCIENCE BV
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/13451
专题	中国科学院南京地质古生物研究所
通讯作者	Agic, Heda
推荐引用方式 GB/T 7714	Agic, Heda,Moczydlowska, M ,Yin, LM . Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - A window into the early eukaryote evolution[J]. Precambrian Research,2017,297:101-130.
APA	Agic, Heda,Moczydlowska, M ,&Yin, LM .(2017).Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - A window into the early eukaryote evolution.Precambrian Research,297,101-130.
MLA	Agic, Heda,et al."Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - A window into the early eukaryote evolution".Precambrian Research 297(2017):101-130.