Colobopsis vitrea

Like the rest of its genus, this Sulawesi ant fields soldiers whose heads are built like corks, and they seal the nest entrance by plugging it with their own faces, a behaviour called phragmosis that is the main reason to keep it. The colony stays small and easy to house, so you can watch that door-guarding up close without a big setup. Living in the trees of Southeast Asia, it wants steady tropical warmth and humidity year-round, and little else beyond that. For a keeper comfortable with heat and moisture, it is an approachable way into the curious group of plug-headed carpenter relatives.

A wood-dwelling omnivore that collects sugars and honeydew and brings insects back for the brood, working its arena after dark. Keep a sugar source available at all times and offer protein two or three times a week.

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

Found the colony in a test tube and move it across once the first workers floor it. This tropical wood-dweller nests in hollow branches, with soldiers blocking the entrance, so a branch-cavity nest that holds humidity well, aerated concrete or a 3D-printed wood design kept warm and moist, is the right fit, with a roomy arena. The workers climb smooth glass, so block escapes with fluon (PTFE), an oil line, or talc and water. ANTonTOP formicaria and starter kits handle this warm, humid arboreal setup as one set.

Warm and humid throughout the year. Aim for a nest at 23-27 °C and an arena at 24-28 °C, with humidity at 65-80% in the nest and 55-70% in the arena. Run a thermal gradient across the arena, warming one end, so the colony can settle where it prefers rather than sitting at one fixed temperature. It is tropical with no hibernation, so keep it warm and active right through the year.

Colobopsis build at a moderate, steady pace, with this species reaching up to 1,000 workers over time. Hold the warmth and humidity steady and it keeps progressing without rushing, so this stays a compact, easy-to-watch colony. Your colony arrives as a queen with workers and brood, ready to move into a warm, humid wood-style home.

• The soldiers are phragmotic, using plug-shaped heads to bar the nest entrance and let only nestmates through.
• Colobopsis is a wood-nesting offshoot of the carpenter ants, living inside hollow stems and dead branches rather than excavating soil.
• Several Southeast Asian relatives in this group are the exploding ants that rupture their own bodies in defence, a dramatic trait of the lineage though not present in every species.

Is Colobopsis vitrea good for beginners?

It is rated Intermediate, so it suits a keeper who can hold warmth and humidity.

Does this plug-headed ant need a winter rest?

No, it is tropical and stays active year-round.

Does Colobopsis vitrea sting or bite?

No sting, defence is a mild bite only, so it is easy to handle.

How big can the colony get?

Up to 1,000 workers from a single queen.

How big is the queen and how big are the soldiers?

The queen is 8-11 mm, workers 3-7 mm and soldiers 5-8 mm.

How fast does this Sulawesi arboreal ant grow?

At a moderate, steady Colobopsis pace.

What does it eat?

Sugar water and nectar for carbs, plus crickets and flies for protein.

Will it arrive alive?

You get queen, workers and brood with a heat or cool pack, dispatched within 24 h with tracking for safe live delivery.

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.