Sampling locations of Sanguina nivaloides (red circles), Sanguina aurantia (yellow circles) and regions where both species were sampled (red-yellow circles) in continental Europe (right), on the archipelago of Svalbard (left), in North and South America (middle) and in Antarctica (middle). Numbering corresponds to the sample origin from the following countries: Austria (1–10; 1-Haferkarlespitze, 2-High Tauern, 3–5 Kühtai, 6–10 Ötztal Alps), Italy (11–14; 11–13 Dolomites, 14-Sarntal Alps), Norway (15–19), Slovakia (20-High Tatra Mountains), Slovenia (21-Julien Alps), Switzerland (22-Urner Alps), Svalbard (Norway) (23–36; 23-Amsterdamøya, 24-Ny Ålesund, 25–29 Longyearbyen, 30-Raggfjellet, 31-Midterhuken, 32-Doktorbreen, 33–35 Hornsund, 36-Chomjakovbreen), Colorado (USA) (37–39 Rocky Mountains), Argentina (40-Patagonia), Antarctica (41–42 Antarctic Peninsula). Habitat description of sampling localities including geographical data are shown in Supplementary Table 1.