[9] B. patagonicus is considered a nuisance pest due to their tendency to infest man-made structures but have received a lack of attention because they do not bite, sting, or carry disease.

[13][12] B. patagonicus have long hairs along the mesosoma and relatively large eyes compared to the other species in the Brachymyrmex genus.

[9] In Laboratory settings, an artificial diet containing 30% honey solution, liquid tuna mixture, and caterpillar pieces was observed to support B.

[15] Most invasive ant species display polygyne tendencies, dispersal by budding, and development of supercolonies that contain hundreds of reproductive queens each.

[10] The colony structure of Brachymyrmex patagonicus differs from most invasive ant species in that they are multicolonial and monodomous.

[9] It is hypothesized that B. patagonicus may play an important role in the regulation of the populations of the invasive cactus moth (Cactoblastic cactorum).