Meiofauna diversity – investigations on Halammohydra (Cnidaria, Hydrozoa)

许多海洋小型动物的物种组成和分布模式在很大程度上仍然是未知的。以分布在北海的种类比较少的Halammohydra属为例，考察所描述的种类是否有效，是否存在形态可塑性，种类分布如何。将在四个欧洲海洋站（黑尔戈兰、卑尔根、克里斯汀伯格、罗斯科夫）进行调查。样本标本在形态学上被记录下来，其中大多数具有遗传特征（CO1, ITS2, 18S）。较小比例的标本在形态学上进行了更详细的研究（针孔、超微结构、神经系统的免疫组织化学）。我们期望对这一具有超凡魅力的间质系统成员的物种组成和分布能力有一个清晰的了解。

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.