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首页> 外文期刊>Journal of Paleontology >PHYLOGENETIC ANALYSIS OF SOME BASAL EARLY CAMBRIAN TRILOBITES, THE BIOGEOGRAPHIC ORIGINS OF THE EUTRILOBITA, AND THE TIMING OF THE CAMBRIAN RADIATION
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PHYLOGENETIC ANALYSIS OF SOME BASAL EARLY CAMBRIAN TRILOBITES, THE BIOGEOGRAPHIC ORIGINS OF THE EUTRILOBITA, AND THE TIMING OF THE CAMBRIAN RADIATION

机译：某些基底早寒武纪三叠纪，奥特卫层的生物地理起源和寒武纪辐射的时机的系统发育分析

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摘要

This paper presents a phylogenetic analysis of the "Fallotaspidoidea," a determination of the biogeographic origins of the eutrilobites, and an evaluation of the timing of the Cambrian radiation based on biogeographic evidence. Phylogenetic analysis incorporated 29 exoskeletal characters and 16 ingroup taxa. In the single most parsimonious tree the genus Fallotaspidella Repina, 1961, is the sister taxon of the sutured members of the Redlichiina Richter, 1932. Phylogenetic analysis is also used to determine the evolutionary relationships of two new species of "fallotaspidoids" distributed in the White-Inyo Range of California that have been previously illustrated but not described. These species had been referred to Fallotaspis Hupé, 1953, and used to define the occurrence of the eponymous Fallotaspis Zone in southwestern Laurentia. However, these two new species need to be reassigned to Archaeaspis Repina in Khomentovskii and Repina, 1965. They are described as Archaeaspis nelsoni and A. macropleuron. Their phylogenetic status suggests that the Fallotaspis Zone in southwestern Laurentia is not exactly analogous to the Fallotaspis Zone in Morocco, where that division was originally defined. Thus, changes to the biostratigraphy of the Early Cambrian of southwestern Laurentia may be in order. Furthermore, specimens of a new species referable to Nevadia Walcott, 1910, are recognized in strata traditionally treated as within the Fallotaspis Zone, which is held to underlie the Nevadella Zone, suggesting further biostratigraphic complexity within the basal Lower Cambrian of southwestern Laurentia.
机译：本文介绍了“ Fallotaspidoidea”的系统发育分析， 确定真绿生物的生物地理起源， 并基于对寒武纪辐射的时间进行了评估。 关于生物地理证据。系统发育分析并入了 29个外骨骼特征和16个组内分类单元。在最简约的一棵 树中，落马属Repina，1961年， 是Redlichiina Richter（1932年）缝合成员的姊妹分类群。分析还用于确定 分布在加利福尼亚怀特-因尤地区的两个新的“ fallotaspidoids” 的进化关系先前已说明但未描述。这些物种 在1953年被称为FallotaspisHupé，并使用 定义了西南Laurentia中同名的Fallotaspis带的发生。但是，这两个新物种需要 重新分配给Khomentovskii和Repina，1965年的Archaeaspis Repina。 它们被描述为Archaeaspis nelsoni和 A。大ple它们的系统发育状况表明，西南Laurentia的 Fallotaspis区与摩洛哥的Fallotaspis区并不完全相似，而摩洛哥的Fallotaspis区最初是由 定义的。因此，西南洛伦西亚早期寒武纪的 的生物地层变化可能是有序的。 此外，一个新物种的标本可参考Nevadia Walcott于1910年被确认为法洛派蒂斯地区（Fallotaspis Zone）内的传统地层 ，该地层被认为是 Nevadella区的基础，表明其内部生物地层复杂性进一步Laurentia西南部的基底下寒武统。

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    《Journal of Paleontology》 |2002年第4期|692-708|共17页
  • 作者

    BRUCE S. LIEBERMAN;

  • 作者单位

    Departments of Geology and Ecology and Evolutionary Biology, University of Kansas, 120 Lindley Hall, Lawrence, 66045-7613, blieber@ku.edu;

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