Phosphatized Polar Lobe-Forming Embryos from the Precambrian of Southwest China-Reference-Cited by-同舟云学术

Phosphatized Polar Lobe-Forming Embryos from the Precambrian of Southwest China

Published:2006-06-16 Issue:5780 Volume:312 Page:1644-1646
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Chen Jun-Yuan¹²³⁴⁵,Bottjer David J.¹²³⁴⁵,Davidson Eric H.¹²³⁴⁵,Dornbos Stephen Q.¹²³⁴⁵,Gao Xiang¹²³⁴⁵,Yang Yong-Hua¹²³⁴⁵,Li Chia-Wei¹²³⁴⁵,Li Gang¹²³⁴⁵,Wang Xiu-Qiang¹²³⁴⁵,Xian Ding-Chang¹²³⁴⁵,Wu Hung-Jen¹²³⁴⁵,Hwu Yeu-Kuang¹²³⁴⁵,Tafforeau Paul¹²³⁴⁵

Affiliation:

1. Nanjing Institute of Geology and Paleontology, Institute of Evo/Developmental Biology, and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China.

2. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA.

3. Division of Biology, 156-29, California Institute of Technology, Pasadena, CA 91125, USA.

4. Department of Geosciences, University of Wisconsin, Milwaukee, WI 53201, USA.

5. Department of Life Science, National Tsing Hua University, Hsinchu 300, Taiwan, China.

Abstract

In developing embryos of some extant spiralian animals, polar lobe formation is one of the symmetry-breaking mechanisms for segregation of maternal cytoplasmic substances to certain blastomeres and not others. Polar lobe formation leads to unique early cleavage morphologies that include trilobed, J-shaped, and five-lobed structures. Fossil embryos similar to modern lobeforming embryos are recognized from the Precambrian Doushantuo Formation phosphates, Weng'an, Guizhou Province, China. These embryos are abundant and form a developmental sequence comparable to different developing stages observed in lobe-forming embryos of extant spiralians. These data imply that lobe formation is an evolutionarily ancient process of embryonic specification.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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