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The internal anatomy and the cell movement of Lower Cambrian gastrula
YAO Xiaoyong 1 *,ZHENG Yajuan 1,GUO Junfeng 1,HAN Jian 2
1.School of Earth Science and Resources, Chang'an University, Xi'an 710054
2.Department of Geology, Northwest Universit, Xi'an, 710069
*Correspondence author
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Funding: 教育部博士点基金(No.No.20120205120008), 中央高校基本科研业务费资助项目(No.No.310827171013), 科技部青年973(No.No.2013CB837100)
Opened online: 5 April 2017
Accepted by: none
Citation: YAO Xiaoyong,ZHENG Yajuan,GUO Junfeng.The internal anatomy and the cell movement of Lower Cambrian gastrula[OL]. [ 5 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4723528
 
 
The extraordinarily well-preserved fossil embryos recovered from the Lower Cambrian are known from both cleavage and gastrula stages and, consequently, it has the potential to yield vital insights into developmental evolution at that time. However, they are not generally accepted as gastrula fossils because of the gastrulation processes and internal structures in these embryos are poorly characterized. Here we show rare gastrula specimens in which internal anatomical features preserved. The yolk consumed in the endoderm formation and the pharynx was appeared after the archenteron formed indicates our embryo fossils are most probably 'direct-developing' animals; although the epibolic gastrulation and radial symmetry suggest a cnidaria Sea anemone affinity, the precise phylogenic position of them is still uncertain because of lacking reliable later stages in development; we also present the cell movement of epibolic gastrulas, the embryonic mechanisms have been compared with modern pattern: enveloping layer extension were observed in our fossils; and similar with purse-string-like contraction of marginal cells, the zigzag margin contraction of the epibolic frontier to reduce their perimeter that push the margin forward, all of which hint that the embryonic mechanisms of the modern embryos had evolved in Lower Cambrian.
Keywords:Paleontology and Stratigraphy; the early Cambrain; Kuanchuanpu biota; embryo fossils; internal anatomy
 
 
 

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