| A Fresh Look at Dickinsonia： Removing It from Vendobionta |
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| 作者姓名： | ZHANG Xingliang Joachim REITNER |
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| 作者单位： | [1]Early Life Institute and Department of Geology, State Key Laboratory for Continental Dynamics, Northwest University, Xi＇an, Shaanxi 710069, China [2]Geowissenschafiliches Zentrum, Abteilung Geobiologie, Universitat Gottingen, 37077 Gottingen, Germany |
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| 基金项目： | 国家自然科学基金;国家自然科学基金 |
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| 摘 要： | The Ediacaran Dickinsonia is well-known for being the only fossil to be assigned to many phyla, ranging from lichens, Cnidaria, Piatyheiminthes, Annelida, and a phylum of its own to a nonmetazoan kingdom. A new specimen from the Ediacaran fine-grained sandstone on the Winter Coast of the White Sea in northern Russia, which has an age of -555 million years ago, preserved convincing internal anatomies of definite animals, comparable with meridionai canals of extant ctenophores （comb jellies）. Additionally, we reconsidered Dickinsonia as a biradiaily symmetrical animal rather than a bilateral one as previously thought. The animal nature of Dickinsonia is, thus, well established and its affinities are most probably allied to ctenophores. This research is not only removing Dickinsonia from Vendobionta, but also bringing the fossil record of ctenophores forward to 20 million years before the Cambrian ＂explosion＂.
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| 关 键 词： | 栉水母类 后生动物 生物群 化石 |
| 收稿时间： | 2005-10-18 |
| 修稿时间： | 2006-03-13 |
A Fresh Look at Dickinsonia:Removing It from Vendobionta |
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| Authors: | ZHANG Xingliang Joachim REITNER |
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| Abstract: | Abstract: The Ediacaran Dickinsonia is well‐known for being the only fossil to be assigned to many phyla, ranging from lichens, Cnidaria, Platyhelminthes, Annelida, and a phylum of its own to a nonmetazoan kingdom. A new specimen from the Ediacaran fine‐grained sandstone on the Winter Coast of the White Sea in northern Russia, which has an age of ?555 million years ago, preserved convincing internal anatomies of definite animals, comparable with meridional canals of extant ctenophores (comb jellies). Additionally, we reconsidered Dickinsonia as a biradially symmetrical animal rather than a bilateral one as previously thought. The animal nature of Dickinsonia is, thus, well established and its affinities are most probably allied to ctenophores. This research is not only removing Dickinsonia from Vendobionta, but also bringing the fossil record of ctenophores forward to 20 million years before the Cambrian “explosion”. |
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| Keywords: | Dickinsonia Ctenophora Vendobionta metazoan Ediacara biota Ediacaran |
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