Fluteau

There are very few localities only in Scandinavia: two to three localities for Norway (one of which is a cluster of four lakes), three small localities in Sweden (20 km² occupied area) and three localities in Denmark.
In Ireland it is known from two localities that are 500 m apart. It can be found at higher altitude (450 m) in the western UK (Wales) (Preston et al. 2002).
In Czech Republic, it is found in two pools of less than 1 km² (Natura 2000). In Poland, the species occurred in more than 100 localities in the past, now it inhabits no more than several tens of lakes in the Pomeranian Lake District. Two isolated localities were recorded in 2004 on Lower Silesia, in Żwirownia w Starej Olesznej (a gravel pit in Stara Oleszna) and in Starorzecze Potok in Nysa Łużycka River Valley, and in Zgorzelec-Osiecznica Forest. In Germany, there are around 115 localities and the species is common in the northwest.
In France, it occurs everywhere except for the Mediterranean or the Alps, there are 416 localities in total. In the Netherlands, it is known from more than 100 sites. In the Iberian Peninsula, its population is confined to five areas that are very spread apart summing up to 13 known populations that are often fluctuating. In Galicia, where this species was considered extinct, recent localities have been found in A Terra Cha (Lugo) (Bañares et al. 2004).

The populations are decreasing in Belgium, Germany, France, Netherlands, and Poland and stable in Sweden, Czech Republic and Spain (Commission of the European Communities 2009).