Plectroctena mandibularis, called the ringbum ant or millipede munching ant[1][2][3], is a large species of ant that ranges from the Eastern Cape, South Africa, through East Africa to Ethiopia.

Their workers forage singly[4] in open terrain, and their colony size seldom exceeds fifty individuals.

[4][5] It is one of the large Plectroctena species, including P. conjugata and P. minor, that specialize on adult millipedes as prey.

[5] The nest is composed of chambers that are typically located two feet or more below the surface, and the nest entrances are usually marked by large piles of earth.

[4][5] They get their colloquial, common name from their tendency to prey on millipedes.