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Tonian (Neoproterozoic) eukaryotic and prokaryotic organic-walled microfossils from the upper Visingsö Group, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology. Univ Liege, Dept Geol, B-4000 Liege, Belgium..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2018 (English)In: Palynology, ISSN 0191-6122, E-ISSN 1558-9188, Vol. 42, no 2, p. 220-254Article, review/survey (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS INC , 2018. Vol. 42, no 2, p. 220-254
Keywords [en]
Organic-walled microfossils, cysts, microalgae, chlorophytes, prasinophytes, Baltica
National Category
Biological Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-357067DOI: 10.1080/01916122.2017.1335656ISI: 000429604300007OAI: oai:DiVA.org:uu-357067DiVA, id: diva2:1238255
Funder
Swedish Research Council, 621-2012-1669Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-08-13Bibliographically approved

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