For the first time in limnofaunistic bibliography the present taxonomic knowledge about the
different clades of chelicerata having adapted to an aquatic or amphibious lifestyle along
various evolutionary pathways is brought together in an overview for the Central-European
fauna. A total number of 746 taxa is covered over 99 % of these at species level. In Volume 7
2-1 altogether 211 species are treated - 70 species of spiders 7 species of Astigmata (3 of
which to be identified only at family genus resp. species group level) 17 species of
Oribatida 27 species and one subspecies of Halacaridae 45 species of terrestrial
Parasitengona (4 of which to be identified only at genus level) and 45 species of Hydrachnidia
(4 Stygothrombioidea 3 Hydrovolzioidea 16 Hydrachnoidea and 22 Eylaoidea). Volume 7 2-2 deals
with 179 species of Hydrachnidia (58 Hydryphantoidea and 121 Lebertioidea). This third volume
(Volume 7 2-3) includes taxonomic keys and ecological information for 355 species of the two
highly diverse Hydrachnidia superfamilies Hygrobatoidea (241 species and one subspecies) and
Arrenuroidea (113 species). 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 bottom substrata and open water and
between water and land.
