Doushantuo Embryos Preserved Inside Diapause Egg Cysts
Access StatusFull text of the requested work is not available in DASH at this time ("dark deposit"). For more information on dark deposits, see our FAQ.
MetadataShow full item record
CitationYin, Leiming M., Maoyan Y. Zhu, Andrew H. Knoll, Xunlai L. Yuan, Junming M. Zhang, and Jie Hu. 2007. Doushantuo embryos preserved inside diapause egg cysts. Nature 446 : 661-663.
AbstractPhosphatized microfossils in the Ediacaran (635 - 542 Myr ago) Doushantuo Formation, south China, have been interpreted as the embryos of early animals. Despite experimental demonstration that embryos can be preserved, microstructural evidence that the Doushantuo remains are embryonic and an unambiguous record of fossil embryos in Lower Cambrian rocks, questions about the phylogenetic relationships of these fossils remain. Most recently, some researchers have proposed that Doushantuo microfossils may be giant sulphur-oxidizing bacteria comparable to extant Thiomargarita sp. Here we report new observations that provide a test of the bacterial hypothesis. The discovery of embryo-like Doushantuo fossils inside large, highly ornamented organic vesicles (acritarchs) indicates that these organisms were eukaryotic, and most probably early cleavage stage embryos preserved within diapause egg cysts. Large acanthomorphic microfossils of the type observed to contain fossil embryos first appear in rocks just above a 632.5 +/- 0.5-Myr-old ash bed, suggesting that at least stem-group animals inhabited shallow seas in the immediate aftermath of global Neoproterozoic glaciation.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3007654
- FAS Scholarly Articles