Cleavage patterns in Neoproterozoic and Cambrian fossil embryos
2007 (English)In: 51st Annual Meeting of the Palaeontological Association, 2007Conference paper (Other (popular science, discussion, etc.))
The Neoproterozoic-Cambrian phosphoritic layers in southern China hold exceptionally preserved embryos of early animals. The specimens, preserved as diagenetically phosphatized replacements and encrustations, represent different developmental stages from early cleavage through hatching. Recent studies, where fossil embryos were analysed with synchrotron-based X-ray tomographic microscopy (srXTM), have yielded details of cellular and sub-cellular information of the internal embryonic structures. In this study, fossil embryos from both the Early Cambrian Kuanchuanpu Member of the Dengying Formation and the Neoproterozoic Doushantuo Formation have been identified for analysis of their complete three-dimensional morphology. The aim of this study is to depict the different cleavage patterns and the cell geometry of the fossil embryos from the two localities. Thus far, the apparent difference, when comparing the fossil embryos found in the early Cambrian with the Neoproterozoic ones, is that the Cambrian embryos have preserved the developmental stages from blastula to hatching, whereas the Neoproterozoic ones generally seem to be restricted to early cleavage embryos that show only pre-blastula features.
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IdentifiersURN: urn:nbn:se:su:diva-21651OAI: oai:DiVA.org:su-21651DiVA: diva2:188178