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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 the spiders, which include a considerable number of hygrophilous species, and by 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. For the first time the present taxonomic knowledge about these different groups of invertebrates is brought together in an overview for the Central-European fauna. This volume includes taxonomic keys and ecological information concerning hygrophilous and aquatic spiders, a general introduction to mites, and the treatment of three mite groups generally known from terrestrial habitats. Also, the freshwater-dwelling representatives of the originally marine Halacaridae are treated, and the species-rich true freshwater mites (Hydrachnidia) are represented in a general overview.

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Order Araneae Family Argyronetidae THORELL, 1870 Order Acari I - General Introduction - Limnic Acaridida (Astigmata) Family Acaridae Family Histiostomatidae (formerly: Anoetidae) - Limnic Oribatida Family Mucronothridae Family Trhypochthoniellidae Family Malaconothridae Family Hydrozetidae Family Limnozetidae Family Mycobatidae Family Zetomimidae - Halacaridae Subfamily Copidognathinae Subfamily Halacarinae Subfamily Limnohalacarinae Subfamily Lohmannellinae Subfamily Porolohmannellinae Subfamily Rhombognathinae Subfamily Ropohalacarinae - Terrestrial Parasitengona inhabiting transient biotopes Superfamily Calyptostomatoidea Superfamily Erythraeoidea Superfamily Trombidioidea Family Johnstonianida Family Microtrombidiidae Family Tanaupodidae Family Trombidiidae - Hydrachnidia I Superfamily Stygothrombioidea Family Stygothrombiidae Superfamily Hydrovolzioidea Family Hydrovolziidae Superfamily Eylaoidea Family Limnocharidae Family Piersigiidae Family Eylaidae Superfamily Hydrachnoidea Family Hydrachnidae

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