Mystrium

also known as Snap-Jaw Ants, as they have a unique defense mechanism in which they snap their mandibles to generate a powerful strike.

Mystrium is a rare genus of ants in the subfamily Amblyoponinae, and besides their bizarre morphology Mystrium ants have also evolved some unique biological traits. Because Mystrium are rarely encountered, information on their general biology, ecology and behavior remains sparse.

They are presumably predaceous like other species of the subfamily Amblyoponinae, although no direct evidence is available.