Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil)
Acritarchs, a polyphyletic group of acid-resistant organic-walled microfossils, dominate the eukaryotic microfossil record in the Proterozoic (2500–541 Ma) yet exhibit significant reduction in diversity and size at the transition to the Phanerozoic (541–520 Ma). Despite the difficulty of tracing phy...
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ftdoajarticles:oai:doaj.org/article:c2c7111cae9d46cfbab1ffa461f8a283 2023-05-15T15:13:46+02:00 Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) L. Morais T. R. Fairchild B. T. Freitas I. D. Rudnitzki E. P. Silva D. Lahr A. C. Moreira E. A. Abrahão Filho J. M. Leme R. I. F. Trindade 2021-12-01T00:00:00Z https://doi.org/10.3389/feart.2021.787011 https://doaj.org/article/c2c7111cae9d46cfbab1ffa461f8a283 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2021.787011/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2021.787011 https://doaj.org/article/c2c7111cae9d46cfbab1ffa461f8a283 Frontiers in Earth Science, Vol 9 (2021) acanthomorph acritarchs phosphatized microfossils Neoproterozoic Paraguay belt Ediacaran Science Q article 2021 ftdoajarticles https://doi.org/10.3389/feart.2021.787011 2022-12-31T15:40:13Z Acritarchs, a polyphyletic group of acid-resistant organic-walled microfossils, dominate the eukaryotic microfossil record in the Proterozoic (2500–541 Ma) yet exhibit significant reduction in diversity and size at the transition to the Phanerozoic (541–520 Ma). Despite the difficulty of tracing phylogenetic relationships among acritarchs, changes in their complexity and diversity through time have allowed their use in paleoecological and biostratigraphic schemes. The Doushantuo-Pertatataka Ediacaran acritarch assemblage, for example, is usually considered as restricted to the early Ediacaran between 635 and 580 Ma. But similar, diverse acritarchs have been recovered from younger rocks in Mongolia and Arctic Siberia and are now reported here from phosphatized horizons of the upper Bocaina Formation (ca. 555 Ma), Corumbá Group, SW Brazil. In the overlying black limestones and shales of the latest Ediacaran Tamengo Formation (542 Ma) acritarch diversity is low, but the skeletal metazoans Cloudina and Corumbella are abundant. The Bocaina acritarch assemblage shares forms referable to the genera Leiosphaeridia, Tanarium, Asseserium and Megasphaera with the Doushantuo-Pertatataka assemblage, but also includes specimens similar to the Phanerozoic genus Archaeodiscina in addition to two new complex acritarchs. The first is covered by rounded low conical bumps, similar to Eotylotopalla but differs in having a distinct opening suggestive of greater (multicellular?) complexity. The second, identified here as Morphotype 1, is a double-walled acanthomorph acritarch with scattered cylindrical processes between the walls. The contrast in acritarch diversity and abundance between the Bocaina and Tamengo formations is likely due in part to paleoenvironmental and taphonomic differences (absence of the phosphatization window in the latter), as well as to the appearance of both suspension-feeding skeletal metazoans (Cloudina and Corumbella). The occurrence of Doushantuo-Pertatataka acritarchs in SW Brazil, northern Mongolia, and ... Article in Journal/Newspaper Arctic Siberia Directory of Open Access Journals: DOAJ Articles Arctic Frontiers in Earth Science 9 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
acanthomorph acritarchs phosphatized microfossils Neoproterozoic Paraguay belt Ediacaran Science Q |
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acanthomorph acritarchs phosphatized microfossils Neoproterozoic Paraguay belt Ediacaran Science Q L. Morais T. R. Fairchild B. T. Freitas I. D. Rudnitzki E. P. Silva D. Lahr A. C. Moreira E. A. Abrahão Filho J. M. Leme R. I. F. Trindade Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) |
topic_facet |
acanthomorph acritarchs phosphatized microfossils Neoproterozoic Paraguay belt Ediacaran Science Q |
description |
Acritarchs, a polyphyletic group of acid-resistant organic-walled microfossils, dominate the eukaryotic microfossil record in the Proterozoic (2500–541 Ma) yet exhibit significant reduction in diversity and size at the transition to the Phanerozoic (541–520 Ma). Despite the difficulty of tracing phylogenetic relationships among acritarchs, changes in their complexity and diversity through time have allowed their use in paleoecological and biostratigraphic schemes. The Doushantuo-Pertatataka Ediacaran acritarch assemblage, for example, is usually considered as restricted to the early Ediacaran between 635 and 580 Ma. But similar, diverse acritarchs have been recovered from younger rocks in Mongolia and Arctic Siberia and are now reported here from phosphatized horizons of the upper Bocaina Formation (ca. 555 Ma), Corumbá Group, SW Brazil. In the overlying black limestones and shales of the latest Ediacaran Tamengo Formation (542 Ma) acritarch diversity is low, but the skeletal metazoans Cloudina and Corumbella are abundant. The Bocaina acritarch assemblage shares forms referable to the genera Leiosphaeridia, Tanarium, Asseserium and Megasphaera with the Doushantuo-Pertatataka assemblage, but also includes specimens similar to the Phanerozoic genus Archaeodiscina in addition to two new complex acritarchs. The first is covered by rounded low conical bumps, similar to Eotylotopalla but differs in having a distinct opening suggestive of greater (multicellular?) complexity. The second, identified here as Morphotype 1, is a double-walled acanthomorph acritarch with scattered cylindrical processes between the walls. The contrast in acritarch diversity and abundance between the Bocaina and Tamengo formations is likely due in part to paleoenvironmental and taphonomic differences (absence of the phosphatization window in the latter), as well as to the appearance of both suspension-feeding skeletal metazoans (Cloudina and Corumbella). The occurrence of Doushantuo-Pertatataka acritarchs in SW Brazil, northern Mongolia, and ... |
format |
Article in Journal/Newspaper |
author |
L. Morais T. R. Fairchild B. T. Freitas I. D. Rudnitzki E. P. Silva D. Lahr A. C. Moreira E. A. Abrahão Filho J. M. Leme R. I. F. Trindade |
author_facet |
L. Morais T. R. Fairchild B. T. Freitas I. D. Rudnitzki E. P. Silva D. Lahr A. C. Moreira E. A. Abrahão Filho J. M. Leme R. I. F. Trindade |
author_sort |
L. Morais |
title |
Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) |
title_short |
Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) |
title_full |
Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) |
title_fullStr |
Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) |
title_full_unstemmed |
Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil) |
title_sort |
doushantuo-pertatataka—like acritarchs from the late ediacaran bocaina formation (corumbá group, brazil) |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.787011 https://doaj.org/article/c2c7111cae9d46cfbab1ffa461f8a283 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Siberia |
genre_facet |
Arctic Siberia |
op_source |
Frontiers in Earth Science, Vol 9 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2021.787011/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2021.787011 https://doaj.org/article/c2c7111cae9d46cfbab1ffa461f8a283 |
op_doi |
https://doi.org/10.3389/feart.2021.787011 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1766344294521634816 |