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Fig. 1: Percentage per country of the total number of species covered by the key.  
The area covered by the key extends from the British Islands in the West to Central Europe, spanning the Netherlands, Denmark, Germany, the Czech Republic, Slovakia, Austria, Switzerland, Slovenia, Croatia, Hungary and Poland (highlighted in a yellow or reddish colour). It can be assumed that a high number of the species included may also overlap with the Trichoptera fauna of adjacent areas in Northern France and Northern Italy.

The key enables the identification of 96–100 % of all Trichoptera species known from the British Isles and the Netherlands, 91–95 % of the species known from the Czech Republic and Denmark, 86–90 % of those species known from Germany, Austria, Slovakia, Slovenia and Hungary, 81–85 % of the species known from Croatia and Poland and finally 76–80 % of the species known from Switzerland (shown in figure 1). Species of the genera Hydroptila and Oxyethira (Hydroptilidae) are not included in this calculation.

 
Fig. 2: Percentage per country of the total number of species included in the key.
    Most of the 280 species included in this key are common in Austria, the Czech Republic, Germany and Poland (between 80 and 100 percent). Between 60 and 79 percent can be found in Great Britain, Belgium, Luxembourg, Slovenia, Slovakia and Hungary, 40–59 percent in Ireland, Denmark, the Netherlands, Switzerland and Croatia, and 27 percent in Northern Ireland (shown in figure 2). Species of the genera Hydroptila and Oxyethira (Hydroptilidae) are not included in this calculation.