Iberoformica subrufa

Native to Spain on the Iberian Peninsula, this field ant is built for a Mediterranean climate with a real cool season. The clear contrast between the larger queen and her much smaller workers makes the colony easy to read as it grows, and accepting more than one queen can help it build a strong population over time. Founding is fully claustral, so the queen seals herself in and raises the first brood without foraging. It earns its Intermediate rating mainly from the mandatory four-month winter rest you must schedule, and it suits a keeper happy to plan around that cycle.

An omnivore that hunts insects to raise its larvae while the workers gather honeydew from sap-feeding bugs for energy. Keep a sugar source out at all times and feed protein two to three times a week.

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

Begin this Iberian ant in a small claustral setup or test tube, then move it to an aerated concrete or acrylic nest as the colony expands. It favours a dry-leaning nest in keeping with its Mediterranean home, so keep the walls dry with one damp corner for brood. Worker numbers can reach several thousand, so plan an open foraging arena and fit an escape barrier of fluon (PTFE), oil, or talc and water. ANTonTOP formicaria and starter kits suit this genus, giving a dry nest, wide arena and barrier as one set.

Give it Mediterranean warmth: nest at 22-26 °C, arena at 24-29 °C, with humidity at 50-65% in the nest and 35-55% in the arena. Heat one side so the colony can settle along its own gradient. Wintering is mandatory, a cool rest at 5-10 °C for 4 months that this species needs to cycle properly before the next season.

A moderate grower that can reach a large colony of up to 5,000 workers over time, especially with several queens sharing the egg load. The wide size gap between the big queen and her small workers stays striking as numbers rise. You receive a queen with workers and brood, ready to expand in a dry-leaning nest.

• Iberoformica is a small genus split off from Formica, and for a long time subrufa was simply treated as a Formica species before its own genus was recognised.
• It is essentially an Iberian endemic, adapted to the hot, dry summers of Spain and Portugal where it nests in sun-exposed ground.
• Like its Formica cousins it has no sting and defends itself with formic acid.
• Workers tend honeydew-producing bugs, a sugar partnership shared across this branch of the family.

Is Iberoformica subrufa good for beginners?

It is Intermediate, suited to keepers ready to manage a mandatory four-month winter rest.

Does it need hibernation?

Yes, a winter rest at 5-10 °C for 4 months is mandatory for this species.

Can it sting?

No. It defends with a mild bite and has no sting.

How big does the colony get?

Up to 5,000 workers.

How large is the queen?

10-12 mm, while workers are 4-8 mm.

How fast does it grow?

At a moderate pace, building to a large colony given time and a proper cool season.

What does it eat?

Sugar water, nectar or jelly, and insects such as crickets and flies for protein.

Will it arrive alive?

You receive a queen with workers and brood plus a heat or cool pack, shipped within 24 h with tracking.

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.