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Nature 445, 155-156 (11 January 2007) | doi:10.1038/nature05520; Published online 10 January 2007
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Palaeontology: Embryonic identity crisis
Philip C. J. Donoghue1
Abstract
The oldest known animal fossils, identified as eggs and embryos, had been expected to reveal secrets from a period of great evolutionary change. Will the latest theory about the fossils' origins confound these hopes?
The origin of animals is almost as much a mystery as the origin of life itself. An abundant fossil record extends back 542 million years to the beginning of the Cambrian period, testifying to the establishment of all of today's main groups of animals by this time.
- Philip C. J. Donoghue is in the Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK.
Email: phil.donoghue@bristol.ac.uk
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