First Early Cambrian Radiolaria
First Early Cambrian Radiolaria
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DOI：
10.1144/sp286.10
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发表时间：
2007-01-01
期刊：
影响因子：
--
通讯作者：
Maas, A.
中科院分区：
文献类型：
--
作者：
Braun, A.;Chen, J.;Maas, A.
放射虫骨骼是从中国扬子地台的黑色页岩序列和黑色硅质岩中采集的石灰石结核中发现的。这两个事件都是最早的寒武纪时代。本文报道的这些发现代表了已知最古老的放射虫化石。它们的球形骨架显示出奥陶纪和更年轻的动物群中球形放射虫的典型形态。这种放射状对称的放射虫的出现，以及最有可能的是，一种南极生活方式，现在可以追溯到最早的寒武纪。因此，放射虫是早期海洋浮游生物的一部分，可能与硅质海绵沿着在海洋的硅循环中发挥了重要作用。
Radiolarian skeletons are known from a limestone concretion collected from a black shale succession and from black cherts of the Yangtze Platform, China. Both occurrences are of earliest Cambrian age. The findings, reported in this paper, represent the oldest known fossil Radiolaria. Their spherical skeletons display a morphology typical of spherical radiolarians from Ordovician and younger faunas. This occurrence of radiolarians with radial symmetry and, most probably, a planktonic lifestyle can now be traced back into the earliest Cambrian. Thus, radiolarians have been part of the early oceanic plankton and likely played a significant role in the silica cycle of the oceans along with siliceous sponges.