Phosphatized Polar Lobe-Forming Embryos from the Precambrian of Southwest China
- 16 June 2006
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 312 (5780) , 1644-1646
- https://doi.org/10.1126/science.1125964
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.Keywords
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