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首页> 外文期刊>The Open Paleontology Journal >Phylogenetic and Biogeographic Analysis of Ordovician Homalonotid Trilobites
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Phylogenetic and Biogeographic Analysis of Ordovician Homalonotid Trilobites

机译：奥陶纪Homolonotid三叶虫的系统发生学和生物地理学分析

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摘要

Cladistic parsimony analysis of the trilobite family Homalonotidae Chapman 1980 produced a hypothesis of relatedness for the group. The family consists of three monophyletic subfamilies, one containing Trimerus Green 1832, Platycoryphe Foerste 1919, and Brongniartella Reed 1918; one containing Plaesiacomia Hawle and Corda 1847 and Colpocoryphe Novák in Perer 1918; and one containing Eohomalonotus Reed 1918 and Calymenella Bergeron 1890. All genera are monophyletic, except Brongniartella, which is paraphyletic; as it was originally defined it “gives rise” to Trimerus and Platycoryphe.A modified Brooks Parsimony Analysis using the phylogentic hypothesis illuminates patterns of biogeography, in particular, vicariance and geodispersal of homalonotids, during the late Ordovician. The analysis yields three major conclusions about homalonotid biogeography: homalonotids originated in Gondwana; Avalonia and Laurentia were close enough during the late Ordovician to exchange taxa, especially when sea level rose sufficiently; and long distance dispersal events occurred between Armorica and Florida, and also between Arabia and a joined Laurentia-Avalonia.
机译：对三叶虫科Homalonotidae Chapman 1980的克拉德简约主义分析得出了该群体相关性的假设。该家族由三个单系亚科组成，一个亚科包括Trimerus Green 1832，Platycoryphe Foerste 1919和Brongniartella Reed 1918;另一个是亚科。其中一个载有Plaesiacomia Hawle和Corda，1847年和ColpocorypheNovák，位于Perer，1918年;另一类是单系的，除了Brongniartella是共生的。根据系统发育假说，改良的布鲁克斯简约分析法阐明了生物地理学的模式，尤其是奥陶纪晚期的人为脊突的变异和地理分布。该分析得出有关类人猿生物地理学的三个主要结论：人类猿人起源于冈瓦纳;奥陶纪晚期，Avalonia和Laurentia足够近，可以交换分类单元，特别是在海平面上升足够的时候;阿尔莫里卡和佛罗里达之间以及阿拉伯与加入的劳伦西亚·阿瓦隆尼亚之间也发生了远距离传播事件。

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