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

Loron, Corentin; Halverson, Galen; Rainbird, Robert; Skulski, Tom; Turner, Elizabeth; Javaux, Emmanuelle

doi:10.1017/jpa.2021.45

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

Loron, Corentin; Halverson, Galen; Rainbird, Robert et al.

2021 • In Journal of Paleontology

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https://hdl.handle.net/2268/263678

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10.1017/jpa.2021.45

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Abstract :

[en] 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.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Loron, Corentin ; Université de Liège - ULiège > Département de géologie > Early Life Traces & Evolution-Astrobiology

Halverson, Galen

Rainbird, Robert

Skulski, Tom

Turner, Elizabeth

Javaux, Emmanuelle ; Université de Liège - ULiège > Département de géologie > Early Life Traces & Evolution-Astrobiology

Language :

English

Title :

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

Publication date :

2021

Journal title :

Journal of Paleontology

ISSN :

0022-3360

Publisher :

Cambridge University Press, United Kingdom

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 22 September 2021

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