Lower Cambrian vendobionts from China and early diploblast evolution
Lower Cambrian vendobionts from China and early diploblast evolution
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DOI：
10.1126/science.1124565
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发表时间：
2006-05-05
期刊：
影响因子：
56.9
通讯作者：
Yasui, K
中科院分区：
文献类型：
--
作者：
Shu, DG;Morris, SC;Yasui, K
埃迪卡拉组合早于寒武纪后生动物大爆发，应该在这次辐射中发挥了至关重要的作用。然而，它们更广泛的关系仍然难以控制，并且难以与早期后生动物系统发育相结合。在这里，我们描述了来自下寒武统澄江拉格施塔特（中国云南）的一种叶状化石，Stromatoveris (S. psygmoglena sp. nov.)，它与埃迪卡拉动物生物惊人地相似。精美的保存揭示了间隔紧密的分支，可能有纤毛，这似乎代表了栉水母的诊断梳排的前体。因此，这一发现对于该门和相关双倍体细胞的早期进化具有重要意义，其中一些双倍体细胞独立进化出叶状习性。
Ediacaran assemblages immediately predate the Cambrian explosion of metazoans and should have played a crucial role in this radiation. Their wider relationships, however, have remained refractory and difficult to integrate with early metazoan phylogeny. Here, we describe a frondlike fossil, Stromatoveris ( S. psygmoglena sp. nov.), from the Lower Cambrian Chengjiang Lagerstatte ( Yunnan, China) that is strikingly similar to Ediacaran vendobionts. The exquisite preservation reveals closely spaced branches, probably ciliated, that appear to represent precursors of the diagnostic comb rows of ctenophores. Therefore, this finding has important implications for the early evolution of this phylum and related diploblasts, some of which independently evolved a frondose habit.