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首页> 外文期刊>Journal of Systematic Palaeontology >Bivalves from the Olenekian (Early Triassic) of south-western Utah: systematics and evolutionary significance
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Bivalves from the Olenekian (Early Triassic) of south-western Utah: systematics and evolutionary significance

机译：来自犹他州西南部的Olenekian（三叠纪早期）的双壳类：系统学和进化意义

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摘要

The recovery from the end-Permian mass extinction event was a key interval in the history of life, but few modern studies provide systematic data on benthic marine faunas from the epoch immediately following the crisis. Here, the bivalve fauna from the early Spathian (Olenekian, late Early Triassic) Virgin Limestone Member of the Moenkopi Formation is comprehensively documented for the first time. The new genus Sementiconcha (Myophoricardiidae), type species Sementiconcha recuperator sp.nov., and the new species Leptochondria nuetzeli, Eumorphotis ericius, E. virginensis and Pleuromya prima, are described. Leptochondriidae is placed in synonymy with Asoellidae, which is revised. With 27 species belonging to 18 genera, the Virgin Limestone Member records the highest bivalve diversity reported so far from this time interval, questioning previous claims that the recovery from the end-Permian mass extinction was delayed until the Middle Triassic. The two bivalve subclasses (Pteriomorphia and Heteroconchia) that are present in the Virgin Limestone Member clearly differ in their evolutionary contexts. Pteriomorphs of the Virgin Limestone are nearly exclusively composed of genera that survived the end-Permian mass extinction event, whereas heteroconchs are highly dominated by genera that evolved in the Early Triassic. This contrasting evolutionary background probably reflects differential effects of the end-Permian mass extinction event and subsequent crises on these two subclasses, possibly related to differences in filter feeding efficiency and shell mineralogy. The high proportion of infaunal heteroconchs, including deep-infaunal Pholodomyoida, is an additional indicator of a relatively advanced recovery stage, further corroborating that recovery of benthic organisms was well underway during the late Early Triassic.
机译：从二叠纪末期大灭绝事件中恢复是生活史上的一个关键时期，但是很少有现代研究提供有关危机后立即从时代开始的底栖海洋动物的系统数据。在这里，首次全面记录了来自Spathian早期（Olenekian，三叠纪晚期）处女石灰岩成员Moenkopi组的双壳类动物区系。描述了新的Sementiconcha（Myophoricardiidae）属，Sementiconcha恢复器sp.nov。类型和新的Leptochondria nuetzeli，Eumorphotis ericius，E。virginensis和Pleuromya prima。线粒体科已被修订为Asoellidae。维珍石灰岩成员有27个属18属的物种，是该时期迄今为止双壳类生物多样性最高的物种，质疑先前的说法，即从二叠纪末期生物大灭绝的恢复被推迟到中三叠纪。处女石灰石成员中存在的两个双壳类亚类（蕨类和异形壳类）在进化背景上明显不同。维尔京石灰岩的蕨类植物几乎完全由在二叠纪末期生物灭绝事件中幸存下来的属组成，而异质海螺则主要由早于三叠纪的属组成。这种截然不同的进化背景可能反映了二叠纪末期生物灭绝事件和随后危机对这两个亚类的不同影响，这可能与过滤器进料效率和壳矿物学的差异有关。包括深部的臭虫科在内的大量不常见的海螺，是恢复阶段相对较晚的另一个指标，进一步证实了三叠纪晚期晚期底栖生物的恢复进展顺利。

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  • 来源
    《Journal of Systematic Palaeontology》 |2013年第4期|263-293|共31页
  • 作者

    Michael Hautmann; Andrew B. Smith; Alistair J. McGowan; Hugo Bucher;

  • 作者单位

    Palaeontologisches Institut und Museum, Universitaet Zuerich, Karl Schmid-Strasse 4, 8006 Zuerich, Switzerland;

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

    School of Geographical and Earth Sciences,University of Glasgow, Gregory Building, Lilybank Gardens, Glasgow, G12 8QQ, UK;

    Palaeontologisches Institut und Museum, Universitaet Zuerich, Karl Schmid-Strasse 4, 8006 Zuerich, Switzerland;

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  • 关键词

    bivalves; Early Triassic; taxonomy; mass extinction; recovery;

    机译：双壳类三叠纪早期;分类;大规模灭绝;复苏;

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