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Raman spectra of a Lower Cambrian ctenophore embryo from southwestern Shaanxi China

机译:陕西西南部下寒武统c虫胚胎的拉曼光谱

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摘要

The Early Cambrian (≈540 million years old) Meishucun fossil assemblage of Ningqiang County (Shaanxi Province), China, contains the oldest complex skeletonized organisms known in the geological record. We here report the finding in this assemblage of an exquisitely preserved late-stage embryo of a ctenophore (“comb jelly”), its fine structure documented by confocal laser scanning microscopy and shown by Raman spectroscopy to be composed of carbonaceous kerogen permineralized in apatite. In its spheroidal morphology, the presence of eight comb rows and the absence of tentacles, this embryo resembles an adult ctenophore (Maotianoascus octonarius) known from the immediately younger Chengjiang fauna of Yunnan, China. The oldest ctenophore and the only embryonic comb jelly known from the fossil record, this exceptionally well preserved specimen provides important clues about the early evolution of the phylum Ctenophora and of metazoans in general.
机译:中国宁强县(陕西省)的寒武纪早期(约5.4亿年历史)的梅树村化石组合包含了地质记录中已知的最古老的复杂骨架生物。我们在这里报告了一个发现的保存完好的c鱼后期胚胎(“果冻”)的发现,其共聚焦激光扫描显微镜记录的精细结构由拉曼光谱法证明是由磷灰石矿化的碳质干酪根组成。在其球状形态上,存在八排梳子而没有触手,这种胚胎类似于成年的ten虫(Maotianoascus octonarius),从中国云南澄江地区较年轻的动物中就知道了。从化石记录中得知,最古老的c虫和唯一的胚梳果冻,保存得非常好的标本提供了有关Ctenophora门和后生动物早期进化的重要线索。

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