Molecular phylogeny and systematics in lobose testate amoebae (Arcellinida)

有壳叶状变形虫（Arcellinidae）是有壳变形虫中最大的类群。它们存在于世界各地几乎所有的水生和陆生栖息地。由于他们的测试，这些变形虫非常好地使他们成为古生物学和古生态学重建环境变化的宝贵工具。由于实际原因，分类主要是基于测试特征，但这些特征受外部因素的影响，因此形态种的变异性和可塑性很大。其结果是不确定如何界定甚至常见和丰富的物种。在这个项目中，我们希望重建Arcellidae的分子系统发育，并重新评估它们在Arcellinida中的位置。我们计划开发一个框架，结合分子（SSU-，LSU rDNA和ITS）和形态特征的Arcella种的分类。我们的目的是澄清广泛分布的，但可能是集体形态种的种边界。一个核心方面是这些物种的当地种群是否由许多不同的菌株或神秘物种组成，以及这些物种在德国和匈牙利的地理分布情况。

Testate lobose amoebae (Arcellinidae) are the largest group of testate amoebae. They are present worldwide in almost all aquatic and terrestrial habitats. Due to their test these amoebae fossilize very well making them a valuable tool in paleobiology and paleoecology to reconstruct environmental change. For practical reasons classification is largely based on test characters but these characters are influenced by external factors and therefore the variability and plasticity of morphospecies is large. The result is an uncertainty how to delimit even common and abundant species. In this project we want to reconstruct the molecular phylogeny of the Arcellidae and reevaluate their position in the order Arcellinida. We plan to develop a framework for the classification of Arcella-species that combines molecular (SSU-, LSU rDNA and ITS) and morphological characters. Our aim is it to clarify the species boundaries of widely distributed but probably collective morphospecies. A central aspect is the question whether local populations of these species are composed of many different strains or cryptic species and how these are distributed geographically in Germany and Hungary.