Early embryogenesis of potential bilaterian animals with polar lobe formation from the Ediacaran Weng'an Biota, South China

	Early embryogenesis of potential bilaterian animals with polar lobe formation from the Ediacaran Weng'an Biota, South China
	Yin, ZJ; Zhu, MY; Tafforeau, P; Chen, JY; Liu, PJ; Li, G; Li G(黎刚)
刊名	PRECAMBRIAN RESEARCH
	2013
卷号	225 页码:44-57
关键词	Doushantuo Ediacaran Fossils Bilaterian Embryo Polar lobe Weng'an biota
英文摘要	Exquisite phosphatized eggs and embryos from the Ediacaran Doushantuo Formation (Weng'an biota, ca.580Ma) of Guizhou, southwestern China have greatly expanded our knowledge of the diversity and palaeobiology of early multicellular animals, and contributed to our understanding of the origins of sponge, cnidarian and other potential eumetazoans. However, the key question of whether triploblastic bilaterian animals are present in the Weng'an biota remains controversial. In the present study, scanning electronic microscopy (SEM) and propagation phase contrast synchrotron X-ray microtomography (PPC-SR-mu CT) are used to prove the presence of bilaterian embryos in the Doushantuo phosphorite. Based on the well preserved connection neck between the polar lobe (PL) and the egg or blastomere as shown by the high-resolution internal sections conducted by PPC-SR-mu CT, three types of PL-forming embryos (calabash-shaped (1-cell stage), trefoil and L-shaped (2-cell stage)) have been confirmed in the Doushantuo phosphorite. These PL-forming embryos are distinct from the PL-forming-like embryos, multicellular algal fossils, and even diagenetic artifacts in morphology and anatomy. In addition, an early developmental sequence for these PL-forming embryos can be inferred for the first time. The results not only provide more convincing evidence for animal affinities among the Doushantuo embryos, but also indicate that polar lobes, which break the symmetrical distribution of morphogenetic determinants in cytoplasm during the early developmental stages of living bilaterian embryos, are a conserved device that occurred already during animal embryogenesis even in the Precambrian. (C) 2011 Elsevier B.V. All rights reserved.
学科主题	Geology
收录类别	SCI
WOS记录号	WOS:000314861200004
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/223790]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Yin, ZJ,Zhu, MY,Tafforeau, P,et al. Early embryogenesis of potential bilaterian animals with polar lobe formation from the Ediacaran Weng'an Biota, South China[J]. PRECAMBRIAN RESEARCH,2013,225:44-57.
APA	Yin, ZJ.,Zhu, MY.,Tafforeau, P.,Chen, JY.,Liu, PJ.,...&黎刚.(2013).Early embryogenesis of potential bilaterian animals with polar lobe formation from the Ediacaran Weng'an Biota, South China.PRECAMBRIAN RESEARCH,225,44-57.
MLA	Yin, ZJ,et al."Early embryogenesis of potential bilaterian animals with polar lobe formation from the Ediacaran Weng'an Biota, South China".PRECAMBRIAN RESEARCH 225(2013):44-57.