The Freshwater Animal Diversity Assessment (FADA) database contains authoritative species lists for several taxonomic groups and distribution data at the level of faunistic regions. The groups currently published (18-06-2010) include Halacaridae, Cnidaria-Hydroida, Cladocera, Copepoda, Mysidaceae, Ephemeroptera, Plecoptera, Bivalvia, Rotifera and Fish
More information on this dataset can be found in the Freshwater Metadatabase - BF3 (http://www.freshwatermetadata.eu/metadb/bf_mdb_view.php?entryID=BF3).