Although not true army ants, Onychomyrmex species display an army-ant life style, including group predation and nomadism.

The genus is known from Queensland, Australia, where it is found living mainly in rotten logs in the rainforests along the eastern coast.

That is, Onychomyrmex queens are dichthadiiform, having a broadened head, very small eyes, worker-like alitrunk without wings or sclerites, and an elongated bulky gaster.

However, belonging to the tribe Amblyoponini, they are evidently amblyoponines and the army-ant like characters are deemed to have evolved through convergent evolution.

[3] Workers of O. hedleyi and O. doddi have been reported to forage in small groups en masse, like the true army ants.