Meiofauna diversity – investigations on Halammohydra (Cnidaria, Hydrozoa)

海洋小型底栖生物中许多生物的物种组成和分布模式在很大程度上仍然未知。以分布于北海的少种的Halammohydra属为例，考察描述的种是否有效，是否存在形态可塑性，以及种的分布情况。调查将在四个欧洲海洋站（黑尔戈兰、卑尔根、克里斯汀贝格、罗斯科夫）进行。取样标本进行形态学记录，其中大部分是遗传特征（CO1，ITS2，18S）。一小部分标本进行形态学研究更详细（cnidome，超微结构，神经系统的免疫组织化学）。我们希望能够清楚地了解这一星际系统中魅力十足的成员的物种组成和分布能力。

Species composition and distribution patterns of many organisms of the marine meiofauna are still largely unknown. Taking the comparably species-poor genus Halammohydra, which is distributed within the North Sea with several species, as example, it shall be investigated whether the described species are valid, whether there is morphological plasticity and how species are distributed. Investigations will be performed at four European marine stations (Helgoland, Bergen, Kristineberg, Roscoff). The sampled specimens are documented morphologically and the majority of them are characterised genetically (CO1, ITS2, 18S) . A smaller proportion of the specimens is investigated morphologically in more detail (cnidome, ultrastructure, immunohistochemistry of the nervous system). We expect to receive a clear picture of the species composition and distribution capacity of this charismatic member of the intersitital system.