Anergates

The single species of this genus, Anergates atratulus, is a social parasite of Tetramorium caespitum. These ants are rarely encountered.

Identification
From Fisher and Cover (2007): The males are found only in nests of the host and are pupoidal - cream to yellow in color, wingless, and barely able to walk. The queens are tiny and physogastric when found in the host nest. When found outside the nest they are dispersing and may be recognized by the unique, prominent median longitudinal depression on the dorsal surface of the gaster.

Castes
A workerless parasite.