| 埃迪卡拉纪陡山沱期瓮安生物群中磷酸盐化
球状化石新材料及其问题讨论 |
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| 引用本文：刘鹏举,尹崇玉,陈寿铭,唐烽,高林志.2009.埃迪卡拉纪陡山沱期瓮安生物群中磷酸盐化
球状化石新材料及其问题讨论[J].地球学报,30(4):457-464. |
| DOI：10.3975/cagsb.2009.04.06 |
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| 基金项目:国家自然科学基金(项目号: 40772013)、中国地质科学院地质研究所中央级公益性基本业务费专项基金(项目号: J0716)和中国地质调查局(项目号: 1212010611801-3) |
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| 中文摘要:磷酸盐化球状化石是埃迪卡拉纪瓮安生物群中的主要化石类型。研究初期其生物属性被归于绿藻; 随后, 由于发现一些球状化石标本保存有类似后生动物卵裂的二分、四分、八分、十六分、三十二分等细胞分裂特征及分裂球规则有序的排列方式, 并且不同分裂阶段的球体大小基本保持一致等特征, 一些学者将其解释为动物的胚胎化石, 并由此引起了国内外众多学者的关注和热烈的讨论。近年来, 又有学者将其解释为巨大的氧化硫细菌。本文在系统介绍这些磷酸盐化球状化石研究现状的基础上, 报道了一些新的球状化 石材料, 包括一些具有出芽现象的球状化石以及Parapandorina和Megaclonophycus之间的过渡分子。新材料的发现显示, 尽管休眠卵和胚胎假说是迄今为止对瓮安生物群中磷酸盐化球状化石的最佳解释, 但仍 有无法解释的一些问题, 这些球状化石确切亲缘关系的确定还有待于新材料的不断发现和研究程度的不断深入。 |
| 中文关键词:埃迪卡拉纪 陡山沱组 瓮安生物群 球状化石 休眠卵 胚胎 |
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| New data of phosphatized globular fossils from Weng’an biota in the Ediacaran Doushantuo Formation and the problem concerning their affinity |
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| Abstract:The affinity of phosphatized globular fossils, one of the important types in the Ediacaran Weng’an biota, was first interpreted as that of green algae. Later, some researchers interpreted these fossils as animal resting eggs and embryos based on the fact that these globular fossils show similar features to early cleavage stages of metazoan embryos from 2-cells to 32-cells and regular arrangement of the cleaving cells, and that they have relatively fixed sizes at various early cleavage stages. The interpretation of metazoan embryos has aroused much interest among palaeontologists, who have paid great attention to Weng’an biota. Recently, some researchers interpreted these globular fossils as giant sulphur bacteria. Some new data of phosphatized globular fossils from Weng’an biota are reported in this paper, including globular fossils with budding structure and transitional forms between Parapandorina and Megaclonophycus. These new data suggest that some characteristics of globular fossils cannot be interpreted by metazoan resting eggs and embryos, though the interpretation of globular fossils from Ediacaran Weng’an biota as embryos is the best hypothesis at present. |
| keywords:Ediacaran Doushantuo Formation Weng’an biota globular fossils resting eggs embryos |
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