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Shale-hosted biota from the Dismal Lakes Group in Arctic Canada supports an early Mesoproterozoic diversification of eukaryotes

Published online by Cambridge University Press:  07 July 2021

Corentin C. Loron Open the ORCID record for Corentin C. Loron [Opens in a new window] ,
Galen P. Halverson ,
Robert H. Rainbird ,
Tom Skulski ,
Elizabeth C. Turner  and
Emmanuelle J. Javaux
Corentin C. Loron
Affiliation:
Early Life Traces and Evolution–Astrobiology Laboratory, UR Astrobiology, University of Liège, Liège, Belgium ,
Galen P. Halverson
Affiliation:
Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada
Robert H. Rainbird
Affiliation:
Geological Survey of Canada, Ottawa, Ontario, Canada ,
Tom Skulski
Affiliation:
Geological Survey of Canada, Ottawa, Ontario, Canada ,
Elizabeth C. Turner
Affiliation:
Harquail School of Earth Sciences, Laurentian University, Sudbury, Ontario, Canada
Emmanuelle J. Javaux
Affiliation:
Early Life Traces and Evolution–Astrobiology Laboratory, UR Astrobiology, University of Liège, Liège, Belgium ,
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Abstract

The Mesoproterozoic is an important era for the development of eukaryotic organisms in oceans. The earliest unambiguous eukaryotic microfossils are reported in late Paleoproterozoic shales from China and Australia. During the Mesoproterozoic, eukaryotes diversified in taxonomy, metabolism, and ecology, with the advent of eukaryotic photosynthesis, osmotrophy, multicellularity, and predation. Despite these biological innovations, their fossil record is scarce before the late Mesoproterozoic. Here, we document an assemblage of organic-walled microfossils from the 1590–1270 Ma Dismal Lakes Group in Canada. The assemblage comprises 25 taxa, including 11 morphospecies identified as eukaryotes, a relatively high diversity for this period. We also report one new species, Dictyosphaera smaugi new species, and one unnamed taxon. The diversity of eukaryotic forms in this succession is comparable to slightly older assemblages from China and is higher than worldwide contemporaneous assemblages and supports the hypothesis of an earlier diversification of eukaryotes in the Mesoproterozoic.

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Journal of Paleontology , Volume 95 , Issue 6 , November 2021 , pp. 1113 - 1137
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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