Danielopol Dan L, Gross Martin, Harzhauser Mathias, Minati Klaus, Piller Werner E
Commission for the Stratigraphical and Palaeontological Research of Austria, Austrian Academy of Sciences, c/o Institute of Earth Sciences (Department of Geology & Palaeontology), Karl-Franzens University of Graz, Heinrichstrasse 26, A-8010 Graz, Austria.
Universalmuseum Joanneum, Department for Geology & Palaeontology, Weinzöttlstrasse 16, A-8045 Graz, Austria.
Joannea Geol Palaontol. 2011;11:273-326.
A project on fossil ostracods from Hennersdorf (Vienna Basin, Middle Pannonian "E" stage) documents the non-marine ostracod (Reuss 1850) as a polymorphic taxon. The high morphological variability of the valves belonging to this species and its geographic distribution in the Lake Pannon point to a widely spread fossil taxon. This traditional view emerges from the fact that A. abscissa displays few homologous "landmarks" (morphological reference points) which makes it difficult to compare morphotypes within and among populations. The present contribution offers arguments for the need of objective criteria when describing ostracods with few visible morphological traits. It is demonstrated that using a composite algorithmic approach which combines information implemented in the computer programme MORPHOMATICA for different variables, measured on interval and ratio scales, is able to define morphological traits objectively. The data analysed with multivariate statistics are further used for diagnostic profiles of clearly delineated morphotypes. The potential taxonomic value of three morphotypes here identified for is discussed. It is argued that this taxon represents a phylogenetic lineage within which a cluster of species with discrete morphological traits exists. Finally, it is proposed to apply similar algorithms for the necessary revision of the whole group of species from Lake Pannon.
一项关于来自亨纳斯多夫（维也纳盆地，潘诺尼亚中期“E”阶段）的化石介形虫的项目证明，非海洋介形虫（罗伊斯，1850年）是一个多态分类单元。属于该物种的瓣膜具有很高的形态变异性，以及其在潘诺尼亚湖中的地理分布，表明这是一个广泛分布的化石分类单元。这种传统观点源于这样一个事实，即横坐标介形虫显示出很少的同源“地标”（形态参考点），这使得难以比较种群内部和种群之间的形态类型。本论文为在描述具有很少可见形态特征的介形虫时需要客观标准提供了论据。结果表明，使用一种复合算法方法，该方法结合了计算机程序MORPHOMATICA中针对不同变量实现的信息，这些变量在区间和比率尺度上进行测量，能够客观地定义形态特征。用多元统计分析的数据进一步用于清晰界定的形态类型的诊断概况。本文讨论了这里确定的三种形态类型的潜在分类学价值。有人认为，这个分类单元代表了一个系统发育谱系，其中存在一群具有离散形态特征的物种。最后，建议应用类似的算法对潘诺尼亚湖的整个横坐标介形虫物种组进行必要的修订。
