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首页> 外文期刊>Journal of Systematic Palaeontology >Morphometries of Leptoplastides marianus (Hoek) (Trilobita, Olenidae) from the Tremadocian of north-western Argentina: taxonomic implications
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Morphometries of Leptoplastides marianus (Hoek) (Trilobita, Olenidae) from the Tremadocian of north-western Argentina: taxonomic implications

机译：来自阿根廷西北部特里克多斯的马立克钩端螺旋体（Hoek）（Ho形目，O科）的形态特征：分类学意义

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摘要

Morphometries can be an important tool in systematic studies, providing taxonomists with strong elements of quantification and formal hypothesis testing. Here, these tools are tested for the trilobite Leptoplastides marianus (Hoek) which was originally described on the basis of three deformed specimens from west Tarija, Bolivia. Following the conclusions of Harrington & Leanza, a wide range of morphological variation is accepted for this species, and the name was applied to a large number of specimens from north-western Argentina. Based on specimens collected from the quebrada Moya (Huacalera, Jujuy), as well as on material in the Harrington & Leanza collections in the University of Buenos Aires, traditional morphometric and geometric morphometric methods were used to evaluate the variation of the cranidial shape of L. marianus sensu Harrington & Leanza. The results allow discrimination between two clearly different morphotypes. The name L. marianus should be restricted to the type specimens, given the deformation of these materials. In addition, L. argentinensis and L. granulosus are both valid names for the two morphotypes recognized in the present paper.
机译：形态计量学可能是系统研究的重要工具，它为分类学家提供了强大的量化和正式假设检验的要素。在这里，对这些工具进行了三叶草Leptoplastides marianus（Hoek）的测试，该工具最初是根据来自玻利维亚西部Tarija的三个变形标本进行描述的。根据哈灵顿和利安扎（Harrington＆Leanza）的结论，该物种广泛的形态变异被接受，并且该名称被用于阿根廷西北部的大量标本。基于从quebrada Moya（Huacalera，Jujuy）收集的标本，以及布宜诺斯艾利斯大学Harrington＆Leanza馆藏的材料，使用传统的形态学和几何形态学方法来评估L的cr形。marianus sensu Harrington＆Leanza。结果允许区分两种明显不同的形态型。考虑到这些材料的变形，应将名称L. marianus限于类型标本。此外，阿根廷乳杆菌和颗粒乳杆菌都是本文所识别的两种形态型的有效名称。

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