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Nuclei and nucleoli in embryo-like fossils from the Ediacaran Weng’an Biota.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-0206-579
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2017 (English)In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 301, p. 145-151Article in journal (Refereed) Published
Abstract [en]

The embryo-like microfossils from the Ediacaran Weng’an Biota (ca. 609 million years old) are among the oldest plausible claims of animals in the fossil record. Fossilization frequently extends beyond the cellular, to preserve subcellular structures including contentious Large Intracellular Structures (LISs) that have been alternately interpreted as eukaryote nuclei or organelles, degraded remains, or abiological structures. Here we present new data on the structure, morphology, and development of the LISs in these embryo-like fossils, based on Synchrotron Radiation X-ray Tomographic Microscopy (SRXTM) and quantitative computed tomographic analysis. All the lines of evidence, including consistency in the number, shape, position, and relative size (LIS-to-cytoplasm ratio) of the LISs, as well as their occurrence within preserved cytoplasm, support their interpretation as cell nuclei. Our results allow us to reject the view that nuclei cannot be preserved in early eukaryote fossils, offering new potential for interpreting the fossil record of early eukaryote evolution.

Place, publisher, year, edition, pages
2017. Vol. 301, p. 145-151
Keywords [en]
Fossil embryo, Doushantuo, Animal, Evolution, Ediacaran
National Category
Geology Evolutionary Biology
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-3274DOI: 10.1016/j.precamres.2017.08.009OAI: oai:DiVA.org:nrm-3274DiVA, id: diva2:1306389
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Swedish Research Council, 2013-4290Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-04-23

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