Nylanderia flavipes Species Introduction
Claustral, and no food is needed until the first workers are running. Queen number is genuinely unsettled here. The published life-history data records this species as monogynous, while multi-queen colonies are sold as a matter of course. Found her singly and treat any extra queens as an experiment rather than a plan.
Native to Japan, Korea and China, and introduced to the northeastern United States, where it is one of the few exotic ants that pushes into intact forest rather than staying on disturbed ground. Nests go in leaf litter, rotting wood and soil, in grassland as readily as woodland. A single nest holds under 500 workers, but colonies are polydomous: buds go independent over the summer and most merge back in autumn. Workers run 2 to 2.1mm, yellowish with a darker gaster and no major caste, and queens 4 to 5.5mm. The remarkable part is the cold: in Japan they forage whenever the ground surface climbs past about 43°F.
A fast, busy, forgiving ant for someone who wants a colony that does something in its first season. Growth is quick, a hundred workers within a few months is normal, and they feed at temperatures where the rest of the collection has gone quiet. Two things end colonies. Skipping the winter is the first, since this is a temperate Asian species that needs three to four months of it. The second is not a colony problem at all: these are 2mm exotics under permit, and an escape is a release.
Formicarium
Leaf litter, rotting wood and soil are all wild nest sites, so a Substratum Sand Ant Nest or any substrate nest that holds moisture reads right, though they settle into acrylic or hydrostone just as readily. Give more than one nest module if you can, as a polydomous colony will use them. Containment is the part to take seriously: seal every fitting, mesh the vents, keep a fluon barrier current.
Water & Humidity
Moderately humid. The wild nest sits in leaf litter, rotting wood or soil, all of which hold damp under a surface that dries between rains, so keep most of the nest damp and leave a drier corner. They forgive a humidity slip far better than their waterlogged southeastern relatives do. A nest that runs dry end to end is still the thing to avoid.
Recommended to use TrapJaw Labs PVA sponges during founding for improved success rates and more nanitics. Keep it charged through diapause too, as the colony still needs water while cold.
Keep a liquid feeder with water (distilled, purified, or spring) in the foraging area at all times. It is recommended to use the TJL Liquid Feeder for these tiny ants as the mesh prevents accidental drowning. Check it every few weeks through diapause as well.
Carbohydrates
Carbohydrates lead, as they do across the genus, and this one wants them constantly. Plant nectar is the wild source. What sets it apart from its relatives is how evenly it splits its attention: at baits in Japan it responded to tuna and honey about equally, which is not how a sugar-obsessed formicine behaves. We recommend providing sugar-water (we use our Ant Nectar Mix) and fresh-water liquid feeders in the outworld at all times.
Occasional small honey drop in the outworld is fine, and it will go fast. Offer it on something you can lift out, because a colony this hungry leaves a sticky mess behind.
Check the feeder every few days. This species eats far more often than its size suggests, and a feeder left dry shows up in the growth rate long before it shows up in the outworld.
Protein
Protein comes second, but not by much, and the cadence is what matters. Offer it two to three times a week and be ready to go more often, since keepers consistently find this species wants feeding every few days rather than weekly. Scale to the brood pile. Growth is quick enough that a schedule set in month one will be wrong by month three.
TrapJaw Labs feeds our N. flavipes colonies with pre-killed D. melanogaster and D. hydei fruit flies and pre-cut mealworms. Cut items small. Whole feeder insects mostly go to waste at this worker size, while cut pieces disappear within hours.
Two to three times per week. Increase amounts to scale with brood development.
Maintenance
Week 1: Seal her in a test tube with a PVA sponge, keep it dark, and leave her alone. No food is needed. If you have more than one queen, found them in separate tubes and decide about combining later, once you know each of them has workers of her own.
Weeks 4–6: First workers ('nanitics') appear, and egg to worker runs about four to six weeks from there. Put out a stocked sugar feeder straight away and start protein two to three times a week. Growth is fast by hobby standards. A hundred workers inside a few months is a normal first season here, not an exceptional one.
Months 2+: Quick, steady growth toward a few thousand workers spread across however many nests you give them. Move them up at about 75% of the nest space in use, and consider adding a second nest rather than a larger one, since this is a species that naturally works several at once. Re-apply the fluon barrier on a schedule.
Diapause is required for this species. Nylanderia flavipes is a temperate Asian ant that stays active through the winter in its native range, and colonies pushed straight through a warm one stall. We recommend 12–16 weeks starting in late October at 40–50°F, using a wine cooler, a mini fridge, or an unheated garage that will not drop below freezing. Remove supplemental heat but keep liquid food and water sources fully-stocked, and check the water every few weeks.
Care Summary
- Diapause is REQUIRED, 12–16 weeks from late October at 40–50°F
- Feed often, this one eats every few days rather than weekly
- Protein 2–3×/week, cut small
- Carbohydrates available 24/7
- Moderately humid nest with a drier corner