Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence
Abstract: The Mesoproterozoic Lakhanda Group (~1030 Ma) preserves one of the most diverse communities of pre-Ediacaran eukaryotes. More precisely, the Lakhanda Biota includes more than twenty taxa that have been assigned to eukaryotes with different degrees of confidence. Eight of these taxa meet cu...
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2021
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Online Access: | http://hdl.handle.net/1959.3/464173 https://doi.org/10.1134/S0012496621050100 |
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ftswinburne:tle:8aa45282-41dc-49fe-a361-45f3e74f7604:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-05-15T15:07:55+02:00 Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence Shuvalova, J. V. Nagovitsin, K. E. Duda, J. P. Parkhaev, P. Yu. Swinburne University of Technology 2021 http://hdl.handle.net/1959.3/464173 https://doi.org/10.1134/S0012496621050100 unknown Pleiades Publishing Ltd http://hdl.handle.net/1959.3/464173 https://doi.org/10.1134/S0012496621050100 Copyright © 2021 Doklady Biological Sciences, Vol. 500, no. 1 (Sep 2021), pp. 127-132 Journal article 2021 ftswinburne https://doi.org/10.1134/S0012496621050100 2021-11-22T23:28:02Z Abstract: The Mesoproterozoic Lakhanda Group (~1030 Ma) preserves one of the most diverse communities of pre-Ediacaran eukaryotes. More precisely, the Lakhanda Biota includes more than twenty taxa that have been assigned to eukaryotes with different degrees of confidence. Eight of these taxa meet current criteria for the identification of eukaryotic fossils in ancient records. These include previously described fossils such as ornamented acritarchs (Valeria lophostriata, Trachyhystrichosphaera aimika), filamentous coenocytic organisms (Aimonema ramosa, Palaeovaucheria clavata), as well as fossils with smooth-walled envelopes and single outgrowth structures (Caudosphaera expansa, Germinosphaera bispinosa, and Jacutianema solubila). In addition to these, we found as yet undescribed fossils which share remarkable similarities with Ourasphaira giraldae, a possible higher fungi species known from the (?) Meso- to Neoproterozoic of Arctic Canada. Regardless of the exact systematic affinity, these fossils can confidently be assigned to eukaryotes because of the size and high morphological complexity. Intriguingly, the organic record of the Lakhanda Formation lacks biomarkers indicative of eukaryotes (that is, regular steranes). This finding would be in line with the idea that eukaryotes were present but not significant in Mesoproterozoic marine ecosystems. However, preliminary data from an ongoing study indicate an advanced thermal maturity of the organic matter, emphasizing that this conclusion might not be drawn with absolute confidence. Article in Journal/Newspaper Arctic Siberia Swinburne University of Technology: Swinburne Research Bank Arctic Canada Doklady Biological Sciences 500 1 127 132 |
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Swinburne University of Technology: Swinburne Research Bank |
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ftswinburne |
language |
unknown |
description |
Abstract: The Mesoproterozoic Lakhanda Group (~1030 Ma) preserves one of the most diverse communities of pre-Ediacaran eukaryotes. More precisely, the Lakhanda Biota includes more than twenty taxa that have been assigned to eukaryotes with different degrees of confidence. Eight of these taxa meet current criteria for the identification of eukaryotic fossils in ancient records. These include previously described fossils such as ornamented acritarchs (Valeria lophostriata, Trachyhystrichosphaera aimika), filamentous coenocytic organisms (Aimonema ramosa, Palaeovaucheria clavata), as well as fossils with smooth-walled envelopes and single outgrowth structures (Caudosphaera expansa, Germinosphaera bispinosa, and Jacutianema solubila). In addition to these, we found as yet undescribed fossils which share remarkable similarities with Ourasphaira giraldae, a possible higher fungi species known from the (?) Meso- to Neoproterozoic of Arctic Canada. Regardless of the exact systematic affinity, these fossils can confidently be assigned to eukaryotes because of the size and high morphological complexity. Intriguingly, the organic record of the Lakhanda Formation lacks biomarkers indicative of eukaryotes (that is, regular steranes). This finding would be in line with the idea that eukaryotes were present but not significant in Mesoproterozoic marine ecosystems. However, preliminary data from an ongoing study indicate an advanced thermal maturity of the organic matter, emphasizing that this conclusion might not be drawn with absolute confidence. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Shuvalova, J. V. Nagovitsin, K. E. Duda, J. P. Parkhaev, P. Yu. |
spellingShingle |
Shuvalova, J. V. Nagovitsin, K. E. Duda, J. P. Parkhaev, P. Yu. Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence |
author_facet |
Shuvalova, J. V. Nagovitsin, K. E. Duda, J. P. Parkhaev, P. Yu. |
author_sort |
Shuvalova, J. V. |
title |
Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence |
title_short |
Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence |
title_full |
Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence |
title_fullStr |
Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence |
title_full_unstemmed |
Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence |
title_sort |
early eukaryotes in the lakhanda biota (mesoproterozoic, southeastern siberia)—morphological and geochemical evidence |
publisher |
Pleiades Publishing Ltd |
publishDate |
2021 |
url |
http://hdl.handle.net/1959.3/464173 https://doi.org/10.1134/S0012496621050100 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Siberia |
genre_facet |
Arctic Siberia |
op_source |
Doklady Biological Sciences, Vol. 500, no. 1 (Sep 2021), pp. 127-132 |
op_relation |
http://hdl.handle.net/1959.3/464173 https://doi.org/10.1134/S0012496621050100 |
op_rights |
Copyright © 2021 |
op_doi |
https://doi.org/10.1134/S0012496621050100 |
container_title |
Doklady Biological Sciences |
container_volume |
500 |
container_issue |
1 |
container_start_page |
127 |
op_container_end_page |
132 |
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1766339342869987328 |