Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence

J. V. Shuvalova; K. E. Nagovitsin; J. P. Duda; P. Yu Parkhaev

doi:10.1134/S0012496621050100

Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence

Переведенное название: Древнейшие эукариоты лахандинской биоты (мезопротерозой, Юго-Восточная Сибирь) – морфологические и биогеохимические данные

J. V. Shuvalova, K. E. Nagovitsin, J. P. Duda, P. Yu Parkhaev

Кафедра исторической геологии и палеонтологии ГГФ

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

Аннотация

Мезопротерозойская лахандинская серия (~1030 млн лет) содержит богатейшую доэдиакарскую биоту, из которой описаны более 20 видов эукариот, но степень достоверности их принадлежности к ядерным организмам различна. Семь из этих таксонов можно уверенно отнести к эукариотам, используя современные критерии определения эукариотических организмов в ископаемой летописи. К ним относятся ранее описанные Valeria lophostriata, Trachyhystrichosphaera aimika, Aimonema ramosa, Palaeovaucheria clavata, Caudosphaera expansa, Germinosphaera bispinosa и Jacutianema solubila. Выявлена новая спорангиеподобная ископаемая форма, близкая к возможным высшим грибам рода Ourasphaira, известного из (?) мезо- и неопротерозойских отложений Арктической Канады. Эукариотическая природа восьми вышеперечисленных ископаемых не вызывает сомнений в связи со сложностью их морфологии и крупными размерами. В то же время проведенный анализ органического вещества пород лахандинской серии показывает полное отсутствие в них стеранов – диагностических биомаркеров эукариот. Полученные результаты подтверждают гипотезу о подчиненной роли эукариот в функционировании морских экосистем мезопротерозоя. Исследование акцентирует внимание на ограничениях в использовании биомаркеров для интерпретации систематического положения ископаемых остатков из отложений, подвергшихся термическому воздействию.

Переведенное название	Древнейшие эукариоты лахандинской биоты (мезопротерозой, Юго-Восточная Сибирь) – морфологические и биогеохимические данные
Язык оригинала	английский
Номер статьи	3
Страницы (с-по)	127-132
Число страниц	6
Журнал	Doklady Biological Sciences
Том	500
Номер выпуска	1
DOI	https://doi.org/10.1134/S0012496621050100
Состояние	Опубликовано - сент. 2021

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title = "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 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.",

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author = "Shuvalova, {J. V.} and Nagovitsin, {K. E.} and Duda, {J. P.} and Parkhaev, {P. Yu}",

note = "Funding Information: The research was supported by the Russian Foundation for Basic Research (project no. 17-54-12077), the German Research Foundation (DFG) (project nos. DU 1450/4-1 and DU 1450/5-1). Publisher Copyright: {\textcopyright} 2021, Pleiades Publishing, Ltd.",

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doi = "10.1134/S0012496621050100",

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Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence. / Shuvalova, J. V.; Nagovitsin, K. E.; Duda, J. P. и др.

В: Doklady Biological Sciences, Том 500, № 1, 3, 09.2021, стр. 127-132.

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

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T1 - Early Eukaryotes in the Lakhanda Biota (Mesoproterozoic, Southeastern Siberia)—Morphological and Geochemical Evidence

AU - Shuvalova, J. V.

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AU - Duda, J. P.

AU - Parkhaev, P. Yu

N1 - Funding Information: The research was supported by the Russian Foundation for Basic Research (project no. 17-54-12077), the German Research Foundation (DFG) (project nos. DU 1450/4-1 and DU 1450/5-1). Publisher Copyright: © 2021, Pleiades Publishing, Ltd.

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N2 - 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.

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