[2] It is widespread throughout the temperate regions of the Holarctic and high mountains in Southeast Asia.

[2][3] The genus consists of around 200 known species and additional subspecies,[2] although this figure is likely to rise as soon as the Chinese and Nearctic fauna lists are revised.

Subsequently, they use hormones to manipulate the host colony in such a way that eggs of the host queen develop into workers, and parasite brood into sexuals.

[6][7] Similarly, larvae of the butterfly genus Maculinea (a junior synonym of Phengaris, family Lycaenidae) and of the southern armyworm, live inside Myrmica nests where they are either directly fed by ants or prey upon ant brood.

This parasitism is employed primarily by specific species such as Phengaris arion forming predatory relationships.