Dorymyrmex insanus
Temperature
24–30 °C
Humidity
40–60%
Colony size
1,000–5,000
Queen size
4–5 mm
Worker size
2.5–3.5 mm
Diet
Care Guide
Dorymyrmex insanus, often called the pyramid ant for the distinctive cone-shaped mounds they build, is a species that brings the energy of the desert into a formicarium. These ants are monomorphic, with both the queen and workers falling within a narrow size range. The queen measures 4–5 mm, while workers are slightly smaller at 2.5–3.5 mm. Despite their modest dimensions, they are remarkably fast and active, making them a joy to observe as they dart across terrain in search of food. A mature colony can reach between 1,000 and 5,000 workers — a manageable size that offers plenty of action without overwhelming the keeper.
One of the most fascinating traits of Dorymyrmex insanus is their foraging strategy. These ants are highly efficient scavengers and predators, with a particular fondness for honeydew produced by aphids and scale insects. In the wild, they will tend these insects with great care, and in captivity they readily accept sugar water as a substitute. Their diet also includes standard insect protein — small crickets, flies, or roach pieces — which they tear apart with surprising speed. They do not require hibernation, making them ideal for keepers who want year-round activity without the hassle of a cooling period.
Care difficulty
Keeping Dorymyrmex insanus is rated as intermediate, primarily because of their sensitivity to humidity and their need for consistent warmth. They thrive in temperatures between 24 and 30°C and prefer a relatively dry environment with humidity around 40–60%. Overly moist conditions can be detrimental, so it is important to provide a well-ventilated nest with a dedicated hydration area rather than soaking the entire setup. Their claustral founding makes starting a colony straightforward — the queen does not need feeding until the first workers arrive — but maintaining the right balance of heat and dryness requires some attention.
Housing
A formicarium with a dry nest section and a hydrated outworld works best for this species. They are excellent diggers and appreciate a substrate such as sand or a sand-clay mix that allows them to excavate tunnels and chambers. Ensure the outworld has a heat source to keep temperatures in the desired range, and provide a shallow water source (e.g., a test tube with a cotton plug) that offers hydration without raising humidity too high. The nest should be placed in a calm, vibration-free spot.
First days after purchase
Upon receiving your Dorymyrmex insanus colony, give them time to settle in a quiet, warm location. Minimize light exposure and avoid disturbing the nest for at least a few days. Check that the outworld has a steady supply of sugar water and small protein items. The first days are critical — let the ants acclimate before rearranging their setup. Once they begin foraging actively, you can gradually increase interaction. With patience, this lively species will reward you with a bustling, ever-moving colony that brings a piece of the arid landscape into your home.