uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Fossilized nuclei and germination structures identify Ediacaran "animal embryos" as encysting protists
Stockholms universitet, Institutionen för geologiska vetenskaper.
Show others and affiliations
2011 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, 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
Washington, DC: AAAS , 2011. Vol. 334, no 6063, 1696-1699 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-267804DOI: 10.1126/science.1209537ISI: 000298344000065OAI: oai:DiVA.org:uu-267804DiVA: diva2:875098
Available from: 2011-12-27 Created: 2015-11-26 Last updated: 2015-11-30

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Huldtgren, Therese
In the same journal
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 61 hits
ReferencesLink to record
Permanent link

Direct link