Odontomachus hastatus

Size is what sets this trap-jaw apart from the rest of the genus on this list: it is a notably big, leggy ant, which makes the snap-shut mandibles all the more dramatic to watch. Those mandibles latch open under tension and fire closed on contact, either to seize prey or to fling the ant backwards out of trouble. It is a nocturnal hunter from the South American forest, so the colony does its work under low light and rewards evening observation. The high humidity and live-feeding demands make it a Pro pick, best for keepers who already run tropical colonies with confidence.

A visual predator that locks onto live prey and triggers its spring-loaded jaws the instant a target brushes its sensory hairs. Insect prey drives brood growth, with sugary liquids keeping the adult workers fuelled.

★★★ readily · ★★ moderately · ★ occasionally · ✗ not eaten

Begin in a test tube and upgrade when founding workers cover the floor and brood builds. This is one of the larger, long-legged trap-jaws from humid forest, so it wants a moisture-retaining nest in Ytong, gypsum or a hydratable hybrid kept damp, with chamber height for a bigger ant. Give it a generous arena for stalking prey in the open. It climbs well, so run a fluon (PTFE) rim, or oil where PTFE will not hold. ANTonTOP formicaria and starter kits supply a damp nest and arena scaled for a larger tropical species.

Treat this one as a fully tropical species. Keep the nest at 24-27 °C and the arena slightly warmer at 24-28 °C, with nest humidity 75-90% and arena humidity 65-80%. Warm a single side of the setup so the ants can pick their own position along the temperature gradient. No cooling period is needed; warmth and food stay constant all year.

Once the queen settles into laying, numbers climb at a steady tropical rate toward around 500 workers, with these long-legged foragers always worth a watch. Upgrade the arena as activity grows. You receive a queen together with workers and brood, set up to move straight into a warm, humid home.

• This is one of the larger trap-jaw species kept in the hobby, with a queen reaching 15-18 mm and noticeably long legs.
• The genus owns one of the fastest predatory strikes ever recorded, with the jaws accelerating at tens of thousands of times the force of gravity.
• Touched trigger hairs inside the gaping mandibles fire a reflex among the quickest known for any animal.
• Workers can slam their jaws against a surface to launch themselves backwards, turning a feeding tool into an escape mechanism.

Is this big trap-jaw ant good for beginners?

No, it is Pro-rated, best for keepers with tropical experience.

Does Odontomachus hastatus need a winter rest?

No, it is tropical and active year-round; keep it warm and fed.

Does this trap-jaw ant sting or bite?

Yes, the sting is painful, so handle with care.

How big does the colony get?

Up to 500 workers under one queen.

How large is the queen?

Large for the genus at 15-18 mm, with workers at 12-14 mm.

How fast does it grow?

A steady tropical pace once the queen settles.

What does it eat?

Live insects as the main protein plus sugar water, nectar, or jelly; it hunts at night.

Will it arrive alive?

You receive a queen, workers, and brood with a heat or cool pack, shipped in 24 hours with tracking for safe live arrival.

Escape prevention. Coat the inner rim of every open arena with fluon (PTFE), or use talc-and-water or an oil barrier as a backup, and keep a tight, fine-mesh lid on top. Check the barrier regularly, since dust, condensation and feeding debris break a fluon line over time. Keep tubing connectors tight and seal any gaps in the nest.

Keeping reminders. Always offer fresh water and never let the nest dry out completely. Give carbohydrates continuously and protein a few times a week, and remove uneaten insect prey within 24 hours before it moulds. Keep the formicarium out of direct sunlight and away from constant vibration, which stresses a young colony. A water-filled test tube plugged with cotton makes an ideal spare incubator whenever you need one.

Before you buy – do not rehouse too early. Have a test-tube setup or a small formicarium with an outworld and a working barrier ready before your colony arrives. A founding colony grows slowly at first, which is normal. Moving a small colony into a large nest too soon invites mould, mites and stress, and the workers die off one by one. Keep the colony in its open test tube on the arena, plug the nest entrance with cotton, and open up the next chambers only once the colony fills roughly 10-15% of the space.

What we ship. Every colony ships with a live-arrival guarantee, backed by our 24h unboxing-video guarantee: if the queen does not arrive alive, we reship free. Parcels travel with DHL, InPost (PL) or EMS, with a heat or cold pack to suit the season, packed discreetly and securely. We ship across the EU and worldwide, with free shipping over the Europe threshold.