Exceptionally preserved jellyfishes from the Middle Cambrian.

Exceptionally preserved jellyfishes from the Middle Cambrian.
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DOI:
10.1371/journal.pone.0001121
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发表时间:
2007-10-31
期刊:
影响因子:
3.7
通讯作者:
Lieberman BS
Lieberman BS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cartwright P;Halgedahl SL;Hendricks JR;Jarrard RD;Marques AC;Collins AG;Lieberman BS

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刺胞动物代表了一个早期分化的动物群体,因此深入了解它们的起源和多样化是理解后生动物进化的关键。此外,刺胞水母是现代海洋浮游生态系统的重要组成部分。在这里,我们报告异常保存的刺胞水母化石中寒武世(5.05亿年前)Marjum组的犹他州。这是首次描述的寒武纪水母化石,展示了柔软部分解剖学的精美保存,包括被解释为拖曳触手和伞下和伞外表面的结构的详细特征。如果对这些保存下来的特征的解释是正确的,那么它们的存在就是现代水母分类群的特征。这些新发现可能会提供深入了解刺胞动物多样性的范围后不久,寒武纪辐射,并会加强现代的重要分类组成部分的寒武纪时期的地方。
Cnidarians represent an early diverging animal group and thus insight into their origin and diversification is key to understanding metazoan evolution. Further, cnidarian jellyfish comprise an important component of modern marine planktonic ecosystems. Here we report on exceptionally preserved cnidarian jellyfish fossils from the Middle Cambrian (∼505 million years old) Marjum Formation of Utah. These are the first described Cambrian jellyfish fossils to display exquisite preservation of soft part anatomy including detailed features of structures interpreted as trailing tentacles and subumbrellar and exumbrellar surfaces. If the interpretation of these preserved characters is correct, their presence is diagnostic of modern jellyfish taxa. These new discoveries may provide insight into the scope of cnidarian diversity shortly after the Cambrian radiation, and would reinforce the notion that important taxonomic components of the modern planktonic realm were in place by the Cambrian period.
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