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首页> 外文期刊>Journal of Systematic Palaeontology >Gastropods and tergomyans from the Upper Ordovician(Viru-Harju)of the Fagelsang area, Scania,southern Sweden
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Gastropods and tergomyans from the Upper Ordovician(Viru-Harju)of the Fagelsang area, Scania,southern Sweden

机译：瑞典南部斯堪尼亚Fagelsang地区上奥陶纪（Viru-Harju）的腹足动物和畸胎动物

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摘要

A diverse tergomyan and gastropod assemblage is described from the Global Boundary Stratotype Section and Point (GSSP) section of the Sandbian Stage, Upper Ordovician, in the Fagelsang area, Scania, southern Sweden. Deep water graptolitic mudstone and shale comprise the succession, and previously only one gastropod species was known. The new material spans the Sularp Formation through the Lindegard Mudstone (Nemagraptus gracilis-Dicellograptus complanatus biozones). Fourteen species are described: two tergomyan, five bellerophontoid gastropods, and seven anisostrophically coiled gastropods. Three species are new: Peelerophon hodites,Tetranota scanica and Lophospira sandbiana. Three taxa(Tritonophon subtrilo-batus, Tetranota scanica and Holopea mobergi) are found high in the Lindegard Mudstone(Vormsi-Pirgu stages). Cyrtodis-cus, Peelerophon and Tritonophon are recorded for the first time in Baltoscandia. Some taxa may have been transported from shallower water settings, whereas species of Peelerophon, Joleaudella, Mestoronema and Sinuites may have been part of the local benthos. Except for Bucania erratica, no species are shared with the fauna of the coeval Dalby Limestone in Sweden. Deaechospira elliptica, common in the Dalby Limestone, is not recorded at Fagelsang, although two closely related species are found (Deaechospira rotunda and Deaechospira? sp.). The Fagelsang assemblage has more in common with the older to coeval fauna of the Elnes and Arnestad formations in the Oslo Region, Norway (e.g. sharing Joleaudella, Sinuites,Mestoronema and Pararaphistoma). The Sandbian fauna of Fagelsang includes peri-Gondwanan taxa, e.g. Cyrtodiscus,Peelerophon and Deaechospira. Nevertheless, cluster analysis reveals that the faunas of Baltica and Laurentia were most similar, whereas faunas from Perunica and Baltica remained distinct and separated during the Darriwilian-Sandbian. The few similarities may result from spread of a temperate fauna supplementing rather than replacing taxa in deep water assemblages. The main Fagelsang assemblage coincides both with the Baltoscandian Middle Caradoc Faunal Turnover and the Gutenberg Carbon Isotope Excursion.
机译：瑞典南部斯堪尼亚的Fagelsang地区，上奥陶纪桑地阶的全球边界层状剖面和点（GSSP）剖面描述了一种多样的tergomyan和腹足动物的组合。深水砾岩质泥岩和页岩构成了该演替过程，以前仅已知一种腹足动物。新材料通过Lindegard泥岩（Nemagraptus gracilis-Dicellograptus complanatus生物区）跨越了Sularp组。描述了14个物种：两个tergomyan，五个bellerophontoid腹足类和七个各向异性盘旋腹足类。新增了三个物种：Peelerophon d石，Tetranota scanica和Lophospira sandbiana。在Lindegard泥岩（Vormsi-Pirgu阶段）中发现了三个分类单元（Tritonophon subtrilo-batus，Tetranota scanica和Holopea mobergi）。巴拉托斯坎迪亚（Caltodis-cus），Peelerophon和Tritonophon首次被记录下来。一些分类单元可能是从较浅的水域运输过来的，而Peelerophon，Joleaudella，Mestoronema和Sinuites的物种可能是当地底栖动物的一部分。除布卡尼亚（Bucania erratica）外，瑞典的杜比石灰石（Dalby Limestone）动物群没有其他物种。尽管在费格尔桑发现了两个密切相关的物种（圆形圆形无盖螺旋藻和圆形无盖螺旋藻），但在Fagelsang上没有记录到常见于Dalby石灰石中的椭圆形无盖螺旋藻。 Fagelsang组合与挪威奥斯陆地区的Elnes和Arnestad地层的较老的至中世纪的动物群（例如共享Joleaudella，Sinuites，Mestoronema和Pararaphistoma）具有更多共同点。 Fagelsang的Sandbian动物区系包括Gondwanan附近的分类群，例如Cyrtodiscus，Peelerophon和Deaechospira。尽管如此，聚类分析显示，波罗的海和劳伦西亚的动物区系最相似，而佩里尼察和波罗的海的动物区系在达里维安-桑德比亚时期仍然保持着独特和分离。少数相似之处可能是由于温带动物群的扩散补充而不是代替深水组合中的分类群。 Fagelsang的主要组件与巴尔的斯堪的纳中部卡拉多克的Faunal营业额和古腾堡碳同位素巡游同时发生。

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  • 来源
    《Journal of Systematic Palaeontology》 |2013年第4期|295-336|共42页
  • 作者

    Jan Ove R. Ebbestad; Anette E. S. Hoegstroem; Asa M. Frisk;

  • 作者单位

    Department of Earth Sciences, Paleobiology, Uppsala University, Villavaegen 16, SE-752 36, Uppsala, Sweden,Museum of Evolution, Norbyvaegen 16, SE-752 36 Uppsala, Sweden;

    Department of Earth Sciences, Paleobiology, Uppsala University, Villavaegen 16, SE-752 36, Uppsala, Sweden,Troms University Museum, Natural Sciences, NO-9037 Troms,Norway;

    Department of Earth Sciences, Paleobiology, Uppsala University, Villavaegen 16, SE-752 36, Uppsala,Sweden,4Palaeontologisches Institut und Museum, Universitaet Zuerich,Karl-Schmid-Strasse 4, CH-8006 Zuerich,Switzerland;

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  • 正文语种 eng
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  • 关键词

    gastropods; tergomyans; deep water; palaeobiogeography; Sandbian; Mid Caradoc Faunal Turnover;

    机译：腹足动物特戈米亚人深水;古生物地理;桑迪安中卡拉多克农牧业公司营业额;

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