DistributionRead full entry
Range DescriptionB. magnus seems the most abundant in the Atlantic region. The species could be common in the maritime moors, from central Portugal (Serra de Estrela) to Narvik, in Norway. Unlike B. cryptarum, it is present in the Pyrenees, and in the Iberian Peninsula (Rasmont 1984). It is less common eastwards, away from the Atlantic, though it has been found in a few places in southern Finland (Pamilo et al. 1987) and in Poland (Banaszak and Rasmont 1994). Scattered specimens are found even further east, near St Petersburg and Moscow. Reports from further east could refer to other species. B. magnus has not been found in the Balkans, nor in Asia Minor. Its global range has been mapped (Williams et al. 2012). The extent of occurrence (EOO) is 5,389,279 km² and the area of occupancy (AOO) is 6,008 km².