Polyrhachis risoxa

Risoxa is an easy species to read and manage, a slow-moving arboreal Indonesian forager with the characteristic spines that make Polyrhachis such a draw. It is safe and forgiving to observe, with no sting and only a mild bite, so you can watch it work without worry while you learn the tropical routine. The colony centres on one queen and develops steadily, no winter break to plan for, which keeps activity going across the year. A clean, low-fuss first tropical colony.

Risoxa feeds like a typical arboreal Polyrhachis, taking sweet liquids to fuel the workers and insect protein to drive brood growth. Keep a sugar source available at all times and offer protein two to three times a week.

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

Keep a founding colony in a test tube or compact humid nest, with one chamber the workers can keep damp for early brood. Upgrade as the colony fills the space and brood becomes constant. Choose a moisture-holding nest in aerated ytong or acrylic to match its humid, arboreal habits over a dry block. Ring the arena rim with a fluon (PTFE) barrier, or oil or talc and water, as these capable climbers need a reliable edge. ANTonTOP formicaria and starter kits are built for that progression, with a matched humid nest, arena and barrier.

Warm only one end so the ants can self-select along a gradient. Hold 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 year-round.

Growth is steady and measured rather than rapid, building toward a mature size of roughly 500-5000 workers. You receive the queen with workers and brood, ready to continue in a humid nest paired with a roomy arena.

• Polyrhachis is an Old World genus of mostly arboreal ants, with its centre of diversity in the tropics of Asia and Australasia.
• The cuticular spines on the body and waist are protective armour, a defining feature of the ‘spiny ant’ group.
• Being a formicine, it has no sting and defends the nest with formic acid and a firm bite instead.

Is Polyrhachis risoxa good for beginners?

Yes, it is rated Beginner and needs no hibernation, so care stays simple.

Does it hibernate?

No, it is tropical and active all year; keep feeding without lowering the temperature.

Does it sting?

No, no sting, only a mild bite.

How big does the colony grow?

A mature colony reaches roughly 500-5000 workers.

How big is the queen?

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

How fast does it grow?

It grows at a steady, measured pace, typical for Polyrhachis.

What does it eat?

Sugar water or nectar plus insects like crickets and flies.

How is it shipped?

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

Will it arrive alive?

Yes, colonies ship with the right heat or cool pack and tracking to protect them 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.