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Tonian (Neoproterozoic) eukaryotic and prokaryotic organic-walled microfossils from the upper Visingso Group, Sweden

Corentin Loron and Malgorzata Moczydlowska
Tonian (Neoproterozoic) eukaryotic and prokaryotic organic-walled microfossils from the upper Visingso Group, Sweden
Palynology (April 2018) 42 (2): 220-254

Abstract

The diversification of protists and multicellular microorganisms is recorded in numerous worldwide Tonian age successions, including the Visingso Group in Sweden. The Visingso Group contains a taxonomically rich assemblage of cyanobacteria, stromatolites, algal phytoplankton and vase-shaped microfossils. A new record of organic-walled microfossils from the Visingso 1 drillcore reveals the high taxonomic diversity. Several species are reported for the first time from the Visingso Group, and one new species Leiosphaeridia gorda n. sp. is described. They are in gross phycoma-like cysts of the prasinophycean algae Pterospermopsimorpha, Pterospermella, Simia, Macroptycha and Dictyotidium. Morphologically similar to zygotic cysts of chlorophycean algae are Leiosphaeridia gorda n. sp., Cerebrosphaera, Culcitulisphaera and Lanulatisphaera. Schizofusa may represent the earliest yellow-green algae of the Eustigmatiphyte among Stramenopiles. The recorded biodiversity documents the global trend in the evolution of eukaryotic protists during the Tonian Period and the increased radiation of numerous, presumably photoautotrophic biotas, representing various algal lineages.


ISSN: 0191-6122
EISSN: 1558-9188
Serial Title: Palynology
Serial Volume: 42
Serial Issue: 2
Title: Tonian (Neoproterozoic) eukaryotic and prokaryotic organic-walled microfossils from the upper Visingso Group, Sweden
Affiliation: Uppsala University, Palaeobiology Programme, Uppsala, Sweden
Pages: 220-254
Published: 201804
Text Language: English
Publisher: American Association of Stratigraphic Palynologists, Dallas, TX, United States
References: 194
Accession Number: 2018-079635
Categories: Paleobotany
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 4 plates, 1 table, geol. sketch map
N58°02'60" - N58°02'60", E14°19'60" - E14°19'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, American Association of Stratigraphic Palynologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201844
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