Polyrhachis thrinax

Thrinax is a straightforward species for anyone starting with tropical ants, a deliberate Indonesian forager carrying the spines the genus is prized for. It is safe to keep close, with no sting and a bite that barely registers, which makes the founding stage easy and enjoyable to follow. Built around a single queen, the colony has one clear core and grows on a steady track rather than rushing, so there is always measured progress to see. A calm, good-looking first colony.

Thrinax feeds as an arboreal omnivore, with workers drinking sweet liquids for energy and carrying insect prey back to feed the queen and brood. Keep a sugar source available at all times and offer protein two or three times a week.

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

Start a young colony in a test tube or small humid nest, keeping a single chamber damp while the queen raises her first brood. Upgrade once the nest fills and brood is steady. A moisture-retaining nest in aerated ytong or acrylic suits these arboreal climbers better than a dry block. Apply a fluon (PTFE) barrier to the arena rim, or use oil or talc and water, since the workers slip out over smooth walls without one. ANTonTOP formicaria and starter kits cover founding through to a mature colony, supplying a matched humid nest, arena and barrier.

Heat one end only so the ants can choose along a warm-to-cool gradient. Keep the nest at 20-26 °C and the arena at 22-32 °C, with nest humidity at 55-70% and arena humidity at 40-60%. It is tropical with no hibernation, so keep it active and fed throughout the year.

Colonies build at a steady, unhurried pace toward a mature size of roughly 500-5000 workers. You receive the queen with workers and brood, ready to move straight into a humid nest and foraging arena.

• Polyrhachis larvae produce silk, and many species in the genus use it to weave nests among leaves rather than excavating soil.
• The spines that arm the body and petiole make workers difficult for predators to grasp, the trait behind the common name ‘spiny ant’.
• As a member of the Formicinae it is stingless, relying on formic acid and biting mandibles for defence.

Is Polyrhachis thrinax suitable for beginners?

Yes, it is rated Beginner and needs no cool-down period.

Does it need hibernation?

No, it is tropical and active year-round; keep feeding without lowering temperatures.

Does it sting?

No, no sting, only a mild bite.

How big does the colony get?

A mature colony reaches roughly 500-5000 workers.

How large is the queen?

The queen is about 11 mm, with workers at 6-9 mm.

How fast does it grow?

Growth is steady and measured, typical of the genus.

What does it eat?

Sugar water or nectar plus insects such as crickets and flies.

How is it shipped?

Queen, workers and brood with a heat or cool pack, sent within 24 hours with tracking.

Will it arrive alive?

Yes, colonies are packed with a season-matched heat or cool pack and dispatched with tracking to keep them safe in transit.

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.