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Critical appraisal of tubular putative eumetazoans from the Ediacaran Weng’an Doushantuo biota
Swedish Museum of Natural History, Department of Paleobiology.
Swedish Museum of Natural History, Department of Paleobiology.
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2015 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 282, 1-9 p., 2151169Article in journal (Refereed) Published
Abstract [en]

Molecular clock analyses estimate that crown-group animals began diversifying hundreds of millions of years before the start of the Cambrian period. However, the fossil record has not yielded unequivocal evidence for animals during this interval. Some of the most promising candidates for Precambrian animals occur in theWeng’an biota of South China, including a suite of tubular fossils assigned to Sinocyclocyclicus, Ramitubus, Crassitubus and Quadratitubus, that have been interpreted as soft-bodied eumetazoans comparable to tabulate corals. Here, we present new insights into the anatomy, original composition and phylogenetic affinities of these taxa based on data from synchrotron radiation X-ray tomographic microscopy, ptychographic nanotomography, scanning electron microscopy and electron probe microanalysis. The patterns of deformation observed suggest that the cross walls of Sinocyclocyclicus and Quadratitubus were more rigid than those of Ramitubus and Crassitubus. Ramitubus and Crassitubus specimens preserve enigmatic cellular clusters at terminal positions in the tubes. Specimens of Sinocyclocyclicus and Ramitubus have biological features that might be cellular tissue or subcellular structures filling the spaces between the crosswalls. These observations are incompatible with a cnidarian interpretation, in which the spaces between cross walls are abandoned parts of the former living positions of the polyp. The affinity of the Weng’an tubular fossils may lie within the algae.

Place, publisher, year, edition, pages
2015. Vol. 282, 1-9 p., 2151169
Keyword [en]
Doushantuo, Ediacaran, tubular fossils, exceptional fossilization
National Category
Evolutionary Biology Geology
Research subject
Ecosystems and species history
URN: urn:nbn:se:nrm:diva-1251DOI: 10.1098/rspb.2015.1169OAI: diva2:842590
Danish National Research Foundation, DNRF53Swedish Research Council, 2010-3929; 2013-4290
Available from: 2015-07-21 Created: 2015-07-21 Last updated: 2015-09-15Bibliographically approved

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Cunningham, JohnBelivanova, VenetaBengtson, Stefan
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