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The map of European countries, covered by the key.  
The study area extends from the British Islands in the West, over northern France to Central Europe, spanning the Netherlands, Denmark, Germany, the Czech Republic and the alpine regions of Austria, Slovenia, Switzerland and northern Italy (highlighted in a brown colour). Most of the species, listed in this key, can also be found in adjacent countries, such as Poland, Slovakia, Hungary and northern Italy, labelled in a light-brown colour; more than 80 percent of the mayfly fauna of these countries are covered by the key.