Bombus (Alpigenobombus) mastrucatus Gerstäcker, 1869

(Fig. 4)

The taxon mastrucatus was elevated to species level by Williams et al. (2023) based on both morphological and genetic analyses. It was previously considered as infraspecific to B. wurflenii Radoszkowski, 1860 (Rasmont et al. 2021), which is now considered as a species distributed in Turkey, Georgia, Armenia, Azerbaijan, Iran, Russia (North Caucasus, Urals). Both species therefore occur in Europe sensu IUCN, with B. wurflenii being solely distributed in the Urals, and B. mastrucatus more widely distributed (Rasmont et al. 2021; Williams et al. 2023).