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Fossilized nuclei and germination structures identify Ediacaran ‘animal embryos’ as encysting protists.
ETH Zürich. (Swiss Light Source)
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2011 (English)In: Science, ISSN 0036-8075, Vol. 334, no 6063, 1696-1699 p.Article in journal (Refereed) Published
Abstract [en]

Globular fossils showing palintomic cell cleavage in the Ediacaran Doushantuo Formation, China, are widely regarded as embryos of early metazoans, although metazoan synapomorphies, tissue differentiation, and associated juveniles or adults are lacking. We demonstrate using synchrotron-based x-ray tomographic microscopy that the fossils have features incompatible with multicellular metazoan embryos. The developmental pattern is comparable with nonmetazoan holozoans, including germination stages that preclude postcleavage embryology characteristic of metazoans. We conclude that these fossils are neither animals nor embryos. They belong outside crown-group Metazoa, within total-group Holozoa (the sister clade to Fungi that includes Metazoa, Choanoflagellata, and Mesomycetozoea) or perhaps on even more distant branches in the eukaryote tree. They represent an evolutionary grade in which palintomic cleavage served the function of producing propagules for dispersion.

Place, publisher, year, edition, pages
2011. Vol. 334, no 6063, 1696-1699 p.
Keyword [en]
Ediacaran, Development, Protist, Metazoa
National Category
Developmental Biology Geology
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-609DOI: 10.1126/science.1209537OAI: oai:DiVA.org:nrm-609DiVA: diva2:742065
Funder
Swedish Research Council, 2005-4437, 2007-4484
Available from: 2014-08-29 Created: 2014-08-29 Last updated: 2014-09-01Bibliographically approved

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