Polyrhachis vermiculosa

Spiny ants are some of the most decorative ants you can keep, and this Indonesian species carries the look well, with sculpted, spine-backed workers that catch the light. The appeal is the arboreal lifestyle: in the wild Polyrhachis forage up stems and foliage, so a planted outworld lets them climb and behave naturally. It is forgiving for a first proper species, with no sting and only a mild bite, and the semi-claustral founding means you stay involved early, feeding the queen rather than leaving her sealed away. A good pick if you want personality without a difficult care routine.

Like other Polyrhachis, these foragers run on carbohydrates and tend sugary liquids, while the brood is built on insect protein. Offer a standing sugar source and add insects a few times a week, with small prey for the semi-claustral founding queen.

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

Found the queen in a test tube and feed small prey early, since she starts semi-claustrally. Move her on once the first nanitics cover the floor. As a tropical climber this species wants a moisture-holding nest such as Ytong, aerated concrete or a 3D-printed hybrid that stays damp without flooding, paired with a humid arena. Line the arena rim well with fluon (PTFE) or talc and water, because these are agile, persistent climbers. ANTonTOP formicaria and starter kits bring the right damp nest, arena and barrier together as one set.

Lead with a warm gradient for this tropical climber: keep the nest between 20 and 26 C and let the arena sit a little warmer at 22 to 32 C. Nest air wants 55 to 70% humidity, the arena drier at 40 to 60%. Warm only one end so the colony can shuffle brood toward the spot it likes. Being tropical there is no winter rest, so keep the warmth and the food coming through every month of the year.

Expect a steady, unhurried build rather than a population spike. The first workers take time to appear, the pace lifts once a small workforce is foraging, and a mature colony climbs over the years toward 500 to 5000 workers. Your colony ships as the queen with her workers and first brood, ready to move straight into a founding setup with room to grow.

• Polyrhachis is one of the largest of all ant genera, with hundreds of named species across the Old World tropics.
• Many Polyrhachis build nests bound together with larval silk, the workers using their own grubs as living glue guns.
• The genus is overwhelmingly arboreal and slow-moving, relying on spines and tough armour rather than speed to deter predators.
• The ‘vermiculosa’ name points to the worm-like wrinkled sculpturing on the body surface.

Is Polyrhachis vermiculosa good for beginners?

Yes, it is rated Beginner; just remember the queen founds semi-claustrally and needs food early.

Does it hibernate?

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

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 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 of the genus.

What does it eat?

Sugar water or nectar plus insects such as crickets and flies; offer small food to the founding queen too.

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 are packed with the right 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.