Crazy Ant

The crazy ant, Paratrechina longicornis (Family: Formicidae, Subfamily: Formicinae), exhibits polymorphic worker castes, though variation is subtle. Workers typically measure 2.2-3.0 mm in length, possessing unusually long legs and antennae (12-segmented without a club). Their coloration is uniformly dark brown to black. Reproductive alates are present, with queens being slightly larger than workers and males exhibiting distinct genitalic structures. A complete metamorphosis occurs with egg, larval, pupal, and adult stages. Colonies are often multi-queened (polygynous) and reproduce primarily by budding, allowing for rapid colony growth and establishment of new nests without nuptial flights. Developmental time from egg to adult worker is approximately 50-70 days at optimal temperatures of 25-300C and relative humidity of 70-80%.

Paratrechina longicornis is characterized by its erratic, non-linear foraging movements, which gives rise to its common name. Unlike many ant species, they do not follow well-defined trails but instead appear to wander aimlessly across surfaces. This seemingly chaotic behavior allows them to rapidly exploit new food sources. They are highly opportunistic feeders, consuming a wide variety of foods including honeydew (from aphids and other hemipterans), insects (both live and dead), seeds, and various household food items. Foraging activity is often continuous throughout the day and night, with increased activity observed during warmer temperatures and higher humidity levels. Their foraging behavior can lead them into diverse environments, including sensitive indoor areas.