Anochetus risii

Small Trap-Jaw Ant

🐜 At a glance

Origin: 🌏 Southeast Asia and southern China — including Hong Kong, Taiwan, Vietnam and Indonesia
Keeping level: Advanced — tiny hunters that need small live prey and good escape prevention
Queen: A little larger than the workers
Workers: Small, around 5mm, rusty yellow with pale yellow legs and trap jaws
Colony form: Usually a single queen
Founding: Semi-claustral — the queen hunts for her first brood
Mature colony: Small — usually under a few hundred workers
Nest temperature: 24–28°C
Nest humidity: 60–75%
Workers before moving into a nest: 10+
Winter: No hibernation — keep warm all year

📖 About this species

Anochetus are the miniature cousins of Odontomachus: the same lightning-fast trap jaws in a much smaller, golden ant. They are calm, secretive hunters that live in small colonies, so they suit a small nest where you can actually watch them. Prey must be tiny — think fruit flies and springtails rather than crickets.

⚠️ Sting: workers can sting, though their small size makes it mild. Adults only — never handle the ants.

📦 When your ants arrive

⚠️ MOST IMPORTANT: leave the parcel completely unopened, exactly as it arrived, at room temperature for 5 hours. The ants must adjust to your home’s temperature gradually — abrupt temperature changes make ants seriously unwell.
After the 5 hours, check the queen is safe and sound, then leave the colony in its original packaging (test tube still in its tin foil and wrapping) in a quiet spot — in daylight, never direct sunlight — away from vibration and daily household activity.
😴 Give the colony 4 to 5 days of complete rest. The ants were fed before dispatch and need nothing from you during this time. Assemble and water the nest while you wait.
Still workers or a motionless queen after delivery are almost always delivery stress. Check the antennae: moving antennae means she is fine. Almost all recover within 4 to 5 days (a little longer for bigger queens).
Do not remove the black divider inside the test tube (between the two cotton stoppers) — it keeps the ants safe in transit. It has a hole, and the queen and all workers pass through it without any issue.
👑 Start with a colony, never a lone queen or a single worker: choose at least 10 workers with eggs, larvae or pupae laid inside that colony (not added from elsewhere) — that is your proof of a fertile egg-layer. The egg-layer often looks almost identical to the workers, so the brood is the only reliable sign for most keepers. The more workers, the better your chance of success.

🏠 Moving into the ant farm

Keep the colony in its test tube until it has at least 10 workers. Moved earlier, the workers often abandon the queen in the larger space, which can lead to colony failure.
Connect the test tube to the nest with the delivery tin foil still on and leave it for 14 days. Then slide the foil back about 1mm every day until the tube is fully exposed to daylight.
If the ants have not moved in 2 days after the tube is fully exposed, wrap the foil back on, wait another fortnight and repeat the whole process — patience is the key. Moving in happens on the ants’ own time: anywhere from a couple of days to 6 months.
The red filter and black cover stay on the nest at all times — it is pitch dark inside. The black cover can come off once a day for 2 to 3 minutes (ideally at night); the red filter once a week for 2 to 3 minutes.
☀️ Place the ant farm in normal daylight, never direct sunlight (the sun can overheat a nest within minutes). Avoid windows, radiators and heaters, vibrating surfaces, speakers and TVs, strong smells such as the kitchen, and busy walkways. Keep a steady room temperature.

🍯 Feeding

🦗 Live prey is the heart of this species’ diet — it is a true hunter and will not thrive on jelly alone. Offer tiny live prey — flightless fruit flies, springtails, or the smallest cockroach nymphs — 2 to 3 times a week, in the outworld only, sized so a single worker can overpower it.
🔍 Buy live food only from a clean, trusted breeder and check it for mites before it goes in — mites can destroy a colony, starting with the queen. Larger prey the ants accept pre-killed (mealworms, crickets, locusts) should be scalded first: hold it with tweezers in just-boiled water (no longer bubbling) for 10 to 15 seconds, chop it in half and serve on a small tin foil tray.
🥩 NextSwarm Cricket Mash is a useful protein top-up between hunts. A tiny drop of organic honey or Ant Nectar once a week is enough.
🧹 Remove leftovers and uneaten prey after 2 days to prevent mould. A springtail clean-up crew in the outworld helps keep things tidy.

💧 Watering the nest

💧 Use distilled or purified water only — never tap, rainwater or bottled mineral water, even boiled. They carry minerals and microbes that turn a nest green with mould. A litre of distilled water costs a few pounds and lasts over a year.
Water the nest with the pipette provided: pour slowly, a few drops at a time, through the watering hole, and stop as soon as 1 or 2 drops appear inside the nest — that is how you know it is done correctly. More than that is too much.
Once a week is usually right — slightly more in summer, less in winter. Never water the outworld.

🌡️ Temperature and winter

🌴 No hibernation. Anochetus risii comes from a warm climate and must stay at 24–28°C all year round — in a UK home this means gentle heating in the cooler months.
Use the Advanced Heating System Small 4W warming no more than a quarter of the nest, on the side opposite the water inlet, so the ants can choose their temperature. For a colony still in its test tube, use the Heating Mat with Thermostat Small 4W and heat only about 25mm of the tube, at the end opposite the water — never lay the whole tube on the mat.
Never let the colony get cold, and never expose it to abrupt temperature changes.

⭐ Golden rules | Never break these

🚫 Never put ants in a fridge, and never expose them to abrupt temperature changes. Cold does not kill a colony instantly — the ants get sick and die over the following days — and prolonged cold near freezing damages the sperm a queen stores from her nuptial flight, so she may never lay fertile eggs again.
🚫 Never use gel ant farms, Ytong or concrete nests, or DIY nests.
🚫 Never use tap, rain or mineral water, even boiled.
🚫 Never move a colony into a nest too early, and never tip or shake ants out of their tube.
🚫 Never disturb the colony with tapping or handling — vibration stresses the queen and she can stop laying or eat her eggs.
☀️ Never keep the farm in the dark: ants need daylight for their circadian rhythm. Daylight yes — direct sunlight never.
📟 Choose a nest with a pre-installed humidity and temperature meter (our A5 M PLA or A4-2 Smart Meter) — humidity is impossible to check any other way, and it matters most for these species.
🧤 Never handle these ants or let children handle the setup — always use long tweezers and keep the lid closed and the PTFE band fresh.

🛒 Recommended for this species

📚 These care notes cover the essentials only. Please read the full ant farm setup guide and how trap-jaw ants evolved from A to Z. Questions? Message us through our contact form and we will be happy to help. 💚

Written and reviewed by the Best Ants UK team, keeping ants since 1997.