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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; Sugiyama, H; Tang, R; Li G(黎刚); Xian DC(冼鼎昌); Jia QJ(贾全杰)
2009
发表期刊PRECAMBRIAN RESEARCH
卷号173期号:1-4页码:#REF!
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.
文章类型Article
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.
关键词Precambrian embryos Doushantuo Animal evolution Weng'an biota Early animal diversification
学科领域Geology
DOI10.1016/j.precamres.2009.04.004
收录类别SCI
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000269297400019
引用统计
被引频次:28[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226826
专题院士
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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!.
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