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首页> 外文期刊>Journal of Systematic Palaeontology >First bryozoan fauna from the Eocene-Oligocene transition in Tanzania
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First bryozoan fauna from the Eocene-Oligocene transition in Tanzania

机译：坦桑尼亚始新世-渐新世过渡带的第一个苔藓动物区系

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摘要

Records of Cenozoic tropical bryozoan faunas are sparse, particularly from Africa. Here we describe a previously unknown bryozoan 'sand fauna' from a drill core across the Eocene-Oligocene boundary from a hemipelagic clay succession in Tanzania. Although low in diversity, this well-preserved fauna includes four cheilostome species, all new to science: Heteractis tanzaniensis sp. nov., Bragella pseudofedora gen. et sp. nov., Lacrimula kilwaensis sp. nov. and L. crassa sp. nov. The four species vary in mineralogy, with H. tanzaniensis having an entirely aragonitic skeleton, B. pseudofedora being bimineralic and the two species of Lacrimula calcific. These species have either free-living 'lunulitiform' (H tanzaniensis) or rooted 'conescharelliniform' (B. pseudofedora, L. kilwaensis and L. crassa) colonies adapted to life on a soft, unstable seafloor. The peak occurrence of bryozoans in the core coincides with the Eocene-Oligocene Glacial Maximum (EOGM), characterized by global environmental change from a greenhouse to an icehouse world, sea-level fall, cooling of the oceans and changes in water circulation that may have led to enhanced nutrient levels favourable to bryozoans both in Tanzania and elsewhere.
机译：新生代热带苔藓动物区系的记录稀少，尤其是非洲。在这里，我们描述了一个未知的苔藓虫“砂动物区系”，它来自坦桑尼亚中半透明粘土演替过程中始新世-渐新世边界的钻芯。尽管物种多样性低，但这种保存完好的动物群包括四种化学成鞘动物物种，这对科学都是全新的：Heteractis tanzaniensis sp。十一月，Bragella pseudofedora gen。等。十一月，Lacrimula kilwaensis sp。十一月和L. crassa sp。十一月这四种物种的矿物学各不相同，其中坦桑尼希菌具有完全的文石骨架，假双歧双歧杆菌是双矿物的，钙烤乳头菌的两个物种。这些物种具有自由生存的“月季状”（H. tanzaniensis）或生根的“ conescharelliniform”（假双歧杆菌，L。kilwaensis和L. crassa）菌落，适于在柔软，不稳定的海底上生活。核心区的苔藓虫高峰出现与始新世-渐新世冰期最大值（EOGM）相吻合，其特征是全球环境从温室向冰屋世界变化，海平面下降，海洋冷却以及水循环变化可能导致坦桑尼亚和其他地方的营养水平增加，有利于苔藓动物。

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  • 来源
    《Journal of Systematic Palaeontology》 |2018年第5期|225-243|共19页
  • 作者

    Emanuela Di Martino; Paul D. Taylor; Laura J. Cotton; Paul N. Pearson;

  • 作者单位

    Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;

    Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;

    Naturalis Biodiversity Centre, Darwinweg 2, PO Box 9517, 2300 RA Leiden, The Netherlands,School of Biological Sciences, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong SAR, China;

    School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff CF 10 3AT, UK;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    taxonomy; Cheilostomata; sand fauna; Priabonian; Rupelian; mineralogy;

    机译：分类;Cheilostomata;沙类动物;ria骨鲁贝利安语矿物学;

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