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Life in changing fluids: A critical appraisal of swimming animals before the Cambrian

Gold, David (2018) Life in changing fluids: A critical appraisal of swimming animals before the Cambrian. Integrative and Comparative Biology, 58 (4). pp. 677-687. ISSN 1540-7063.

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Molecular and fossil data place the initial diversification of animals in the Neoproterozoic, though there remains too much enough uncertainty to produce an exact chronology. This is unfortunate, as the Neoproterozoic represents a period of intense climate change, including multiple global glaciation events as well changes to ocean chemistry and oxygen content. Several authors have suggested that the coevolution of animals and their environment was tightly coupled, but such hypotheses rest on the presence of swimming (pelagic) species. In this paper, I review the evidence for pelagic animals during the Neoproterozoic. I conclude that there are very few groups of planktotrophic swimming animals that were likely to have existed at this time, with the possible exception of medusozoan cnidarians (jellyfish). Ultimately, hypotheses connecting Earth and animal evolution in the Neoproterozoic need to be tested with more geochemical work, fossil discoveries, and refinement of molecular clocks targeted on the relevant groups.

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Additional Information:© The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. Published: 03 May 2018.
Record Number:CaltechAUTHORS:20180507-074325154
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Official Citation:David A Gold; Life in Changing Fluids: A Critical Appraisal of Swimming Animals Before the Cambrian, Integrative and Comparative Biology, Volume 58, Issue 4, 1 October 2018, Pages 677–687,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86230
Deposited By: Tony Diaz
Deposited On:07 May 2018 15:04
Last Modified:10 Oct 2018 17:53

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