Siliceous spicules in a vauxiid sponge (Demospongia) from the Kaili Biota(Cambrian Stage 5), Guizhou, South China.
Siliceous spicules in a vauxiid sponge (Demospongia) from the Kaili Biota(Cambrian Stage 5), Guizhou, South China.
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贵州省凯里生物群（寒武纪第五期）的软海绵（Demospongia）中的硅质针状体
DOI：
10.1038/srep42945
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发表时间：
2017-02-21
影响因子：
4.6
通讯作者：
Peng J
中科院分区：
文献类型：
--
作者：
Yang XL;Zhao YL;Babcock LE;Peng J
在贵州剑河地区寒武系第五期凯里组中上段钙质泥岩中发现的海绵angulosusongia sinensis化石，具有明显的网状花纹，具有蛭科特征。能量色散x射线光谱（EDS）和拉曼光谱分析表明，这些化石的骨骼元素中存在二氧化硅，表明该分类群具有由针状体组成的骨骼。这是第一次在水蛭科化石中证实硅质骨骼元素，并支持了一些早期脱海绵动物具有生物矿化硅质骨骼的假设，这些骨骼随后在该谱系的进化史中丢失并被海绵所取代。这些新材料为Demosopongiae生物矿化的系统发育和进化提供了重要的见解。
Fossils of the sponge Angulosuspongia sinensis from calcareous mudstones of the middle and upper part of the Kaili Formation (Cambrian Stage 5) in the Jianhe area of Guizhou province, South China, exhibit an apparently reticulate pattern, characteristic of the Vauxiidae. Energy Dispersive X-Ray Spectrometry (EDS) and Raman spectroscopy analysis indicate the presence of silica in the skeletal elements of these fossils, suggesting that this taxon possessed a skeleton comprised of spicules. This is the first confirmation of siliceous skeletal elements in fossils of the family Vauxiidae, and it lends support to the hypothesis that some early demosponges possessed biomineralized siliceous skeletons, which were subsequently lost and replaced by spongin later in the evolutionary history of this lineage. The new materials provide critical insight into the phylogeny and evolution of biomineralization in the Demosopongiae.