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The fossil record of early eukaryotic diversification

Published online by Cambridge University Press:  21 July 2017

Susannah M. Porter
Susannah M. Porter*
Affiliation:
Department of Geological Sciences, University of California, Santa Barbara, CA 93106
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Abstract

The Cambrian explosion can be thought of as the culmination of a diversification of eukaryotes that had begun several hundred million years before. Eukaryotes - one of the three domains of life — originated by late Archean time, and probably underwent a long period of stem group evolution during the Paleoproterozoic Era. A suite of taxonomically resolved body fossils and biomarkers, together with estimates of acritarch and compression fossil diversity, suggest that while divergences among major eukaryotic clades or 'super-groups' may have occurred as early as latest Paleoproterozoic through Mesoproterozoic time, the main phase of eukaryotic diversification took place several hundred million years later, during the middle Neoproterozoic Era. Hypotheses for Neoproterozoic diversification must therefore explain why eukaryotic diversification is delayed several hundred million years after the origin of the eukaryotic crown group, and why diversification appears to have occurred independently within several eukaryotic super-groups at the same time. Evolutionary explanations for eukaryotic diversification (the evolution of sex; the acquisition of plastids) fail to account for these patterns, but ecological explanations (the advent of microbial predators) and environmental explanations (changes in ocean chemistry) are both consistent with them. Both ecology and environment may have played a role in triggering or at least fueling Neoproterozoic eukaryotic diversification.

Type
Research Article
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The Paleontological Society Papers , Volume 10: Neoproterozoic-Cambrian Biological Revolutions , November 2004 , pp. 35 - 50
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Copyright © 2004 by The Paleontological Society 

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