The origin of animals: Can molecular clocks and the fossil record be reconciled?

Cunningham, John A. and Liu, Alexander G. and Bengtson, Stefan and Donoghue, Philip C. J. (2016) The origin of animals: Can molecular clocks and the fossil record be reconciled? BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology, 39 (1). e201600120. ISSN 1521-1878 DOI 10.1002/bies.201600120

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Official URL: http://doi.org/10.1002/bies.201600120

Abstract

The evolutionary emergence of animals is one of the most significant episodes in the history of life, but its timing remains poorly constrained. Molecular clocks estimate that animals originated and began diversifying over 100 million years before the first definitive metazoan fossil evidence in the Cambrian. However, closer inspection reveals that clock estimates and the fossil record are less divergent than is often claimed. Modern clock analyses do not predict the presence of the crown-representatives of most animal phyla in the Neoproterozoic. Furthermore, despite challenges provided by incomplete preservation, a paucity of phylogenetically informative characters, and uncertain expectations of the anatomy of early animals, a number of Neoproterozoic fossils can reasonably be interpreted as metazoans. A considerable discrepancy remains, but much of this can be explained by the limited preservation potential of early metazoans and the difficulties associated with their identification in the fossil record. Critical assessment of both records may permit better resolution of the tempo and mode of early animal evolution.

Item Type: Article
Uncontrolled Keywords: 2016AREP; IA72;
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
07 - Gold Open Access
Journal or Publication Title: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
Volume: 39
Page Range: e201600120
Identification Number: 10.1002/bies.201600120
Depositing User: Sarah Humbert
Date Deposited: 03 Apr 2017 11:03
Last Modified: 28 Apr 2017 16:39
URI: http://eprints.esc.cam.ac.uk/id/eprint/3861

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