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首页> 外文期刊>Journal of Systematic Palaeontology >Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China
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Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China

机译：Helcionelloid Mollusc Anabarella澳大利亚的壳体显微组织从下寒武纪（第2系列）北方新吉形成

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摘要

Although various types of shell microstructures are documented from Cambrian molluscs, the precise organization and mineralogical composition of Terreneuvian molluscs are relatively unknown. Anabarella was one of the first helcionellid molluscs to appear in the Terreneuvian, with the genus surviving until the third epoch of the Cambrian. Here, shell microstructures of Anabarella australis have been studied based on new collections from the lower Cambrian (Series 2) Xinji Formation of the North China Block. Results show that A. australis has a laminar inner shell layer that consists of crossed foliated lamellar microstructure (CFL). Nacreous, crossed-lamellar and foliated aragonite microstructures previously documented in the older (Terreneuvian) species A. plana are here revised as preservational artefacts of the CFL layers. This complex skeletal organization of Anabarella suggests that mechanisms of molluscan biomineralization evolved very rapidly. Morphologically, specimens from the Chaijiawa section show a pattern of distinct 'pseudo-dimorphism' as external coatings are identical to Anabarella, while associated internal moulds are similar to the helcionelloid genus Planutenia. In contrast, internal moulds from the Shangzhangwan section show considerable morphological variation owing to preservational bias and show greater similarities to specimens from South Australia, Northeast Greenland and Germany. These observations demonstrate that the extensive morphological variation seen in the internal moulds of the cosmopolitan genus Anabarella are primarily preservational artefacts and are unlikely to represent the real intra- and interspecific variability of the animal. In these cases, Planutenia is here confirmed to be a subjective synonym of Anabarella.
机译：虽然各种类型的壳体微观结构由寒武纪软骨菌证明，但Terreneuvian Molluscs的精确组织和矿物学组成相对未知。 Anabarella是第一个在Terreneuvian中出现的Helcionellid Molluscs之一，在寒武纪的第三个时期幸存下来。在这里，已经基于来自下寒武纪（第2系列）的新山地街区新吉集体的新系列研究了Anabarella澳大利亚的壳体微观结构。结果表明，A. Australis具有层内壳层，由交叉的叶片层状微观结构（CFL）组成。先前在较旧的（Terreneuvian）物种A中的珠菌式，交叉的层状和叶状物微结构A. Plana在此修改为CFL层的保存人工制品。这种复杂的骨骼组织Anabarella表明软体动物生物矿化的机制非常迅速地发展。形态学上，来自柴家国部分的标本显示出不同的“伪二体”模式，作为外部涂层与Anabarella相同，而相关的内模类似于Helco1植物属Plantenia。相比之下，上张湾段的内模表现出相当大的形态变化，由于保存偏差，与南澳大利亚，东北格陵兰和德国的标本更加相似。这些观察结果表明，在Anabarella的内模的内模粒中看到的广泛形态学变异主要是保存的伪影，并且不太可能代表动物的实际内特异性。在这些情况下，Planutenia在此确认是Anabarella的主观同义词。

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  • 来源
    《Journal of Systematic Palaeontology》 |2019年第24期|1699-1709|共11页
  • 作者

    Li Luoyang; Zhang Xingliang; Skovsted Christian B.; Yun Hao; Li Guoxiang; Pan Bing;

  • 作者单位

    Northwest Univ Dept Geol Shaanxi Key Lab Early Life & Environm State Key Lab Continental Dynam Xian 710069 Shaanxi Peoples R China|Swedish Museum Nat Hist Dept Palaeobiol Box 50007 SE-10405 Stockholm Sweden;

    Northwest Univ Dept Geol Shaanxi Key Lab Early Life & Environm State Key Lab Continental Dynam Xian 710069 Shaanxi Peoples R China;

    Northwest Univ Dept Geol Shaanxi Key Lab Early Life & Environm State Key Lab Continental Dynam Xian 710069 Shaanxi Peoples R China|Swedish Museum Nat Hist Dept Palaeobiol Box 50007 SE-10405 Stockholm Sweden;

    Northwest Univ Dept Geol Shaanxi Key Lab Early Life & Environm State Key Lab Continental Dynam Xian 710069 Shaanxi Peoples R China;

    Chinese Acad Sci Nanjing Inst Geol & Palaeontol State Key Lab Palaeobiol & Stratig Nanjing 210008 Jiangsu Peoples R China;

    Swedish Museum Nat Hist Dept Palaeobiol Box 50007 SE-10405 Stockholm Sweden|Chinese Acad Sci Nanjing Inst Geol & Palaeontol State Key Lab Palaeobiol & Stratig Nanjing 210008 Jiangsu Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Cambrian; Helcionelloida; shell microstructure; taxonomy;

    机译：Cambrian;Helccaloida;壳体微观结构;分类;

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