The data come from the freshwater invertebrate component of the Environment Agency's national ecology database (BIOSYS) and relate to the aquatic stages of the invertebrates. Most data have been collected from main rivers as part of an extensive routine monitoring network. The data are restricted to a selection of families which contain one species only. More information on this dataset can be found in the Freshwater Metadatabase - BF_GBIF_11 (http://www.freshwatermetadata.eu/metadb/bf_mdb_view.php?entryID=BF_GBIF_11).