Anergates atratulus

**Anergates atratulus** is a highly specialized parasitic ant species notable for its unique reproductive strategy and extreme rarity. These small, dark-colored ants are obligate social parasites that cannot survive independently. Worker ants are entirely absent from their colonies; instead, the species relies exclusively on enslaved workers from host *Tetramorium* ant species to maintain their nests and care for their brood. The species exhibits remarkable behavioral adaptations, with queens infiltrating host colonies and eliminating the resident queen to establish dominance. The parasitic colony then depends entirely on the existing host workers, who unknowingly raise *A. atratulus* offspring while their own lineage gradually disappears. *Anergates atratulus* has an extremely limited European distribution, historically recorded in scattered locations across central and northern Europe, including parts of Germany, Scandinavia, and the British Isles. The species inhabits temperate grasslands, forest edges, and areas with suitable host ant populations. The species faces severe threats from habitat fragmentation and loss of suitable grassland ecosystems. Agricultural intensification and urbanization have eliminated many potential nesting sites and disrupted the delicate ecological relationships with host species. Climate change may further restrict the narrow environmental conditions required for successful parasitism. Currently, no specific conservation programs target this species, though some populations may benefit indirectly from general habitat protection measures in nature reserves. The species' cryptic lifestyle and extreme rarity make population monitoring extremely challenging. The outlook for *A. atratulus* remains precarious, with its Critically Endangered status reflecting genuine extinction risk across its historical range.