alexa Phosphatized polar lobe-forming embryos from the Precambrian of southwest China.
General Science

General Science

Biological Systems: Open Access

Author(s): Chen JY, Bottjer DJ, Davidson EH, Dornbos SQ, Gao X, , Chen JY, Bottjer DJ, Davidson EH, Dornbos SQ, Gao X,

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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. This article was published in Science and referenced in Biological Systems: Open Access

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