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Provides an identification key to 279 species of Chironomidae in their final larval stage and 203 higher taxa of the lowlands of North-West Europe. Each taxon has a short description. To distinguish a taxon from a related one differential characteristics are given. For a number of species and higher taxa the biotopes are illustrated by photographs. A key and descriptions are illustrated by more than 850 drawings and the text is hyperlinked to a glossary of scientific terms.