A new macroalgal assemblage from the Xiaoshiba Biota (Cambrian Series 2, Stage 3) of southern China

A new macroalgal assemblage from the Xiaoshiba Biota (Cambrian Series 2, Stage 3) of southern China
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中国南方小石坝生物群(寒武纪系列2,第3阶段)的一个新的大型藻类组合

DOI:
10.1016/j.palaeo.2018.02.029
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发表时间:
2018-06
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Jin-bo Hou
Jin-bo Hou
中科院分区:
其他
文献类型:
--
作者:
Tian Lan;Jie Yang;Xi-guang Zhang;Jin-bo Hou

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中国南方寒武纪(系列 2)红井烧组小石坝 Lagerstätte 中保存完好的伯吉斯页岩型化石为早期后生动物提供了非凡的视角,但从未有关于植物的报道。在这里,我们首先从这个生物群中识别出高度矿化的大型藻类的新组合。根据形态差异,鉴定出3个新属和4个新种:Doulia raragen。等十一月,Eolaminaria simigladiolasp。十一月,Singulariphyca ramosagen。等十一月和Rugophyca longagen。等十一月相对于其他三个物种,S. ramosais广泛分布在床层中,这可能表明该群落中的优势物种。这一新发现填补了澄江生物群和凯里生物群大型藻类详细记录的部分空白,代表了寒武纪第三期末期大型藻类的局部繁盛。该组合表现出与前寒武纪发现的一些大型藻类相似且原始于寒武纪第五期的大型藻类的形态特征,为揭示早期大型藻类的进化生物学和了解前寒武纪-寒武纪奠定了基础。过渡问题。对这个含化石床的埋藏学研究表明,一些保存完好的大型藻类保留在其原始栖息地内。通过对已知寒武纪大型藻类沉积环境的分析,我们认为大型藻类往往保存在相对较深、干扰较少的海洋环境中。
Exquisitely preserved Burgess Shale-type fossils from the Xiaoshiba Lagerstätte in the Cambrian (Series 2) Hongjingshao Formation of southern China provide remarkable perspective on early metazoans but have never been reported with plants. Here we first recognize a new assemblage of highly mineralized macroalgae from this biota. Based on morphological differences, there are three new genera and four new species identified:Doulia raragen. et sp. nov.,Eolaminaria simigladiolasp. nov.,Singulariphyca ramosagen. et sp. nov. andRugophyca longagen. et sp. nov. Relative to the other three species,S. ramosais widely distributed among the beds, which may indicate a dominat species in this community. This new discovery fills part of the long gap in the detailed record of macroalgae between the Chengjiang Biota and the Kaili Biota, representing a localized macroalgal flourish at the end of Cambrian Stage 3. The assemblage that shows morphological characters similar to some macroalgae found in the Precambrian and primitive to those of the Cambrian Stage 5 lays the basis for revealing the evolutionary biology of early macroalgae and understanding the Precambrian-Cambrian transition questions. Taphonomic study of this fossiliferous bed indicates that some well-preserved macroalgae are preserved within their original habitats. Through analyzing the depositional environments of the known Cambrian macroalgae, we suggest that macroalgae tend to be preserved in relatively deep marine environments with less disturbance.
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