Pharaoh Ant

The Pharaoh ant, Monomorium pharaonis, is a holometabolous insect belonging to the family Formicidae, subfamily Myrmicinae. Workers are monomorphic, measuring 1.5–2.0 mm, and workers range from yellow to light brown with a darker abdomen. Queens are larger, 3.5–5.0 mm, typically reddish-brown. The lifecycle from egg to adult worker averages 38–45 days at 27–32°C and 80% RH. Queens can lay 10–12 eggs per day for up to 4–12 months, producing 3500+ eggs in their lifetime. Development ceases below 18°C, and they thrive year-round in structures maintained at 27–30°C and 80%+ relative humidity.

Pharaoh ants are polygyne and polydomous, meaning colonies have multiple queens and establish numerous interconnected satellite nests. This social structure allows for rapid colony expansion and resilience, as colonies readily bud when disturbed or chemically stressed, fragmenting into new viable units. Communication primarily occurs through trail pheromones, which are species-specific enabling coordinated foraging and relocation efforts. They exhibit opportunistic omnivory, preferring high-carbohydrate and high-protein foods, and are known to scavenge on carrion, surgical wounds, and medical waste, contributing to the mechanical transmission of various pathogens like Salmonella spp., Staphylococcus spp., and Pseudomonas aeruginosa, posing significant public health risks in sensitive environments.