Phase contrast synchrotron X-ray microtomography of Ediacaran (Doushantuo) metazoan microfossils: Phylogenetic diversity and evolutionary implications

	Phase contrast synchrotron X-ray microtomography of Ediacaran (Doushantuo) metazoan microfossils: Phylogenetic diversity and evolutionary implications
	Chen, JY; Bottjer, DJ; Davidson, EH; Li, G; Gao, F; Cameron, RA; Hadfield, MG; Xian, DC; Tafforeau, P; Jia, QJ
刊名	PRECAMBRIAN RESEARCH
	2009
卷号	173 期号:1-4 页码:#REF!
关键词	Precambrian embryos Doushantuo Animal evolution Weng'an biota Early animal diversification
通讯作者	Chen, JY (reprint author), Nanjing Univ, LPS, Nanjing Inst Geol & Paleontol, Inst Evo Dev Biol, Eastern Beijing Rd, Nanjing 210093, Peoples R China.
英文摘要	Microfossils from the Ediacaran Weng'an Phosphate Member of the Doushantuo Formation (Guizhou Province, southern China) have received widespread attention. The Doushantuo, which overlies the glacial deposits of the Nantuo Formation, was deposited following the Marinoan glaciation, the last extensive glaciation of Snowball Earth. Radiometric age dating indicates that the Doushantuo is older than 580 my, and hence that these microfossils are older than the Ediacara Biota. However, the diversity represented by these fossils has yet to be fully documented. A recent technological approach that has increasingly been used to image fossils, propagation phase contrast synchrotron X-ray microtomography, has allowed non-destructive study of both exterior and interior features of a variety of Doushantuo microfossils from the gray facies of the Weng'an Phosphate Member, cropping out along the axis of the Mt. Beidou anticline. Studies of Doushantuo embryos demonstrate the existence of a large suite of modern embryonic features, including macromeres and micromeres, cell lineage, polar lobes, compacted epithelia, equal and unequal cleavage, blastulation and gastrulation, and chorionic protection. Because embryos such as those here studied provide only a limited amount of phylogenetic information, and because adult metazoans of the types that produced these embryos have yet to be discovered in Doushantuo-age rocks, these fossilized embryonic forms can at present be assigned only to the various superclades represented amongst living Metazoa. The diversity of the embryos here studied suggests that the metazoan fauna of the Doushantuo may well have included animals of poriferan, cnidarian, and both protostomial (representatives possibly of basal protostome lineages) and deuterostomial affinity. If this interpretation is correct, it would then follow that the last common ancestor of the bilaterian metazoan lineage, as well as the last common ancestor of sponges, cnidarians and bilaterians. pre-dated deposition of the Doushantuo strata. (C) 2009 Elsevier B.V. All rights reserved.
学科主题	Geology
类目[WOS]	Geosciences, Multidisciplinary
收录类别	SCI
WOS记录号	WOS:000269297400019
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/226826]
专题	高能物理研究所_院士
推荐引用方式 GB/T 7714	Chen, JY,Bottjer, DJ,Davidson, EH,et al. Phase contrast synchrotron X-ray microtomography of Ediacaran (Doushantuo) metazoan microfossils: Phylogenetic diversity and evolutionary implications[J]. PRECAMBRIAN RESEARCH,2009,173(1-4):#REF!.
APA	Chen, JY.,Bottjer, DJ.,Davidson, EH.,Li, G.,Gao, F.,...&贾全杰.(2009).Phase contrast synchrotron X-ray microtomography of Ediacaran (Doushantuo) metazoan microfossils: Phylogenetic diversity and evolutionary implications.PRECAMBRIAN RESEARCH,173(1-4),#REF!.
MLA	Chen, JY,et al."Phase contrast synchrotron X-ray microtomography of Ediacaran (Doushantuo) metazoan microfossils: Phylogenetic diversity and evolutionary implications".PRECAMBRIAN RESEARCH 173.1-4(2009):#REF!.