A Caltech Library Service

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

Chen, Jun-Yuan and Bottjer, David J. and Davidson, Eric H. and Dornbos, Stephen Q. and Gao, Xiang and Yang, Yong-Hua and Li, Chia-Wei and Li, Gang and Wang, Xiu-Qiang and Xian, Ding-Chang and Wu, Hung-Jen and Hwu, Yeu-Kuang and Tafforeau, Paul (2006) Phosphatized Polar Lobe-Forming Embryos from the Precambrian of Southwest China. Science, 312 (5780). pp. 1644-1646. ISSN 0036-8075.

PDF - Supplemental Material
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Li, Gang0000-0001-9313-251X
Additional Information:© 2006 American Association for the Advancement of Science. 8 February 2006; Accepted 27 April 2006. Supported by Chinese Academy of Science grant KZCX3-SW-141; National Science Foundation of China grants 42432006, 40302004, 10490190, 60172042, and 10490194; 111 Project and 985-2 Project of Nanjing University, LPS of Nanjing Institute of Geology & Paleontology, NASA/Ames grant NAG2-1541, and an NSC grant. We thank the European Synchrotron Radiation Facility, Taiwan NSRRC, and Beijing Synchrotron Radiation Facility and Photon Factory for provision of synchrotron radiation facilities.
Funding AgencyGrant Number
Chinese Academy of Sciences KZCX3-SW-141
National Science Foundation of China42432006
National Science Foundation of China40302004
National Science Foundation of China10490190
National Science Foundation of China60172042
National Science Foundation of China10490194
Nanjing University985-2
Nanjing Institute of Geology & PaleontologyUNSPECIFIED
National Science Council (Taipei)UNSPECIFIED
Issue or Number:5780
Record Number:CaltechAUTHORS:20141121-115203718
Persistent URL:
Official Citation:Chen, J.-Y., Bottjer, D. J., Davidson, E. H., Dornbos, S. Q., Gao, X., Yang, Y.-H., . . . Tafforeau, P. (2006). Phosphatized Polar Lobe-Forming Embryos from the Precambrian of Southwest China. Science, 312(5780), 1644-1646. doi: 10.1126/science.1125964
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52046
Deposited By: Joanne McCole
Deposited On:21 Nov 2014 21:04
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page