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The geographical range size (number of 611 000 km2 grids) of parasitized (a) bumblebee species and (b) Myrmica ant species plotted against the GRS of their most closely related unparasitized species. The continuous line indicates an equal GRS in host and non-host species. Below the line are species pairs in which the GRS of the parasitized species is larger than that of its closest unparasitized relative.
