Chelicerata are a basically terrestrial group of invertebrates, including many clades whose representatives have never found an evolutionary way to aquatic live. An exception is made by some spiders and the highly diverse aquatic mites which in inland water habitats are represented by members of numerous different clades having evolved an aquatic or amphibious lifestyle along various evolutionary pathways. For the first time in limnofaunistic bibliography, the present taxonomic knowledge about these different groups of invertebrates is brought together in an overview for the Central-European fauna.

This second volume includes taxonomic keys and ecological information for the two species-rich superfamilies Hydryphantoidea and Lebertioidea of the freshwater mites (Hydrachnidia). A further volume in preparation will include the remaining two superfamilies, Hygrobatoidea and Arrenuroidea.

The chelicerata volumes of this series are a basic tool for all limnologists interested in diversity and ecology - in particular for biologists investigating the ecotones between ground- and surface water, between benthos and plankton, and between water and land.