Cyphomyrmex minutus
Temperature
24–28 °C
Humidity
75–90%
Colony size
100–500
Queen size
3–4 mm
Worker size
2–3 mm
Diet
Care Guide
Cyphomyrmex minutus is a diminutive yet fascinating fungus-farming ant species that offers a truly unique keeping experience for the advanced hobbyist. Despite their tiny size — the queen measures only 3 to 4 mm and workers a mere 2 to 3 mm — these ants maintain a complex symbiotic relationship with a specific fungus they cultivate inside the nest. The colony remains modest, typically reaching 100 to 500 workers, but this small scale is offset by the intricate care required for the fungus garden. Founding is claustral, meaning the queen seals herself into a chamber after mating and raises her first brood without foraging, relying on her own body reserves. During this initial phase, she also begins the fungus culture using stored substrate.
The most remarkable aspect of keeping Cyphomyrmex minutus is their diet and feeding behaviour. Unlike typical seed‑eaters or insectivores, these ants rely on their fungus as the primary food source for the colony. The workers constantly tend the garden, removing waste and adding fresh organic material — such as fruit pieces, crushed insects, or even commercial ant jelly — which the fungus breaks down into digestible nutrients. A steady supply of protein (e.g., small insects or boiled egg) and sugary fruits (like apple or banana) is essential to keep the fungus healthy. The ants themselves also consume some of the fruit and prey directly, but the garden remains central to colony survival.
Care difficulty
Keeping Cyphomyrmex minutus is classified as advanced, and for good reason. The most challenging aspect is maintaining the exceptionally high humidity levels of 75 to 90 percent, as both the ants and their fungus require a consistently moist environment. Drastic drops in humidity can quickly kill the fungal garden and doom the colony. Temperature must be kept stable between 24 and 28 °C, with no hibernation needed. Additionally, these ants are sensitive to sudden changes in conditions and disturbance, so a steady, controlled setup is essential.
Housing
A small, well‑ventilated formicarium with a dedicated nest chamber that can be precisely humidified is ideal. The nest should have a substrate or medium (such as a soft plaster or clay) that retains moisture without becoming waterlogged. A heating cable or mat can help maintain the temperature range, but ensure it does not dry out the nest. A connection to a foraging arena is necessary for feeding and waste removal — but be aware that the foraging area should also be kept fairly humid to avoid stressing the colony. Because the fungus is sensitive to mold and bacterial overgrowth, rigorous cleanliness is required; remove uneaten food regularly.
First days after purchase
When your Cyphomyrmex minutus colony arrives, place the formicarium in a quiet, dark spot and allow the ants to acclimatise for at least 48 hours without disturbance. Check that the nest humidity is already high — if the substrate feels dry, mist it lightly with distilled water. Offer a tiny piece of fruit and one or two small protein sources (like a crushed fruit fly) in the foraging area, but avoid overfeeding. Observe the workers’ behaviour: they should begin tending the fungus and exploring the arena. Resist the urge to open the nest frequently; patience is key. Over the first week, gradually adjust conditions to meet the required 24–28 °C and 75–90% humidity, monitoring the fungus for any signs of drying or contamination. With careful attention, these tiny farmers will reward you with a mesmerising glimpse into one of nature’s most ancient agricultural partnerships.