Rover Ant

The rover ant, Brachymyrmex patagonicus (Family: Formicidae, Subfamily: Formicinae), is a diminutive species, with workers typically measuring only 1.5-2.0 mm in length. They are characterized by a relatively stocky body, with a dark brown to black coloration, often shiny, and are sometimes referred to as 'dark rover ants'. The antennae are 9-segmented without a club. Queens are slightly larger than workers (2.5-3.0 mm) and alate during nuptial flights, as are males. This species undergoes complete metamorphosis (egg, larva, pupa, adult). Colonies are typically polygynous and polydomous, allowing for rapid population increases and spread. Reproduction occurs primarily through budding, where queens and workers simply move to establish new nests. Developmental time from egg to adult is relatively short, approximately 20-30 days under optimal warm and humid conditions (28-320C, >80% RH), facilitating quick establishment of new infestations.

Brachymyrmex patagonicus is an omnivorous and highly opportunistic forager, consuming a wide variety of food sources including honeydew from sap-feeding insects, small dead insects, and various household food items, particularly sweets. They forage both day and night, though activity may be reduced during the hottest parts of the day. Foraging trails are often faint and irregular, making them difficult to track. They are known for their rapid, erratic movements when disturbed. While they do not sting, they can become a significant nuisance due to their extremely small size, allowing them to penetrate nearly any crack or crevice, and their tendency to establish multiple nests both indoors and outdoors. They are attracted to moisture and will often forage for water.