Temnothorax annexus

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Morelos, Mexico, dry forest and scrubland habitats ^[1]
• Colony Type: Likely monogyne (single queen) based on typical Temnothorax patterns, though not specifically documented for this species.
• Size & Growth:
  • Queen: ~4-5 mm, inferred from Temnothorax genus patterns.
  • Worker: ~2-4 mm, inferred from Temnothorax genus patterns.
  • Colony: Up to 200 workers, typical for small Temnothorax species.
  • Growth: Moderate
  • Development: 6-10 weeks at 20-24°C, based on related species. (Timing not confirmed for T. annexus, temperature strongly influences speed.)
• Antkeeping:
  • Temperature: 20-24°C, typical for warm-climate Temnothorax. Keep stable within this range.
  • Humidity: Moderate (nest substrate slightly moist but not wet). Reflects natural dry forest conditions.
  • Diapause: Likely yes, requires 2-3 months at 10-15°C in winter, inferred from genus patterns.
  • Nesting: Small cavities: under rocks, in rotting wood, or hollow twigs. In captivity use a test tube, Y-tong (AAC) nest with narrow chambers, or a small plaster nest. Keep nesting area dry to moderately moist.
• Behavior: Calm and non‑aggressive. Workers are active foragers for small insects and honeydew. Their primary defense is fleeing, they possess a modified stinger for venom smearing but rarely use it on humans. Extreme caution needed to prevent escapes due to tiny size.
• Common Issues: tiny size makes escapes easy, use fine mesh and tight seals., colonies grow slowly over months or years, patience required., winter dormancy likely needed, but timing varies with origin., wild‑caught colonies may carry parasites., overfeeding causes mold in small setups, remove leftovers promptly.

Housing and Nest Setup

Temnothorax annexus suits small setups well. Start in a test tube, the queen likely raises the first workers in the water‑reservoir section. After the colony reaches 10-20 workers, move them to a small Y‑tong or plaster nest with narrow chambers. These mimic the natural cavities they use. Keep the nest on the drier side, with a connected outworld for feeding. Use fine mesh on all openings to prevent escapes.

Feeding and Diet

Offer a varied diet: small live prey (fruit flies, springtails), pieces of insects, and a constant sugar source (honey water or sugar water). Feed protein 2-3 times per week in amounts the workers can remove in a day. Remove leftover food promptly to avoid mold. Prey items should be no larger than the ants themselves.

Temperature and Seasonal Care

Maintain a stable 20-24°C for active brood rearing. They can tolerate slightly cooler or warmer conditions, but growth slows outside this range. Based on their Mexican origin and typical Temnothorax biology, they likely benefit from a winter rest period: 2-3 months at 10-15°C. If your room temperature stays in the low 20s year‑round, you may not need artificial cooling, but a seasonal cooldown is recommended for long‑term colony health.

Behavior and Colony Dynamics

Temnothorax annexus is peaceful and non‑aggressive. Workers are methodical foragers, not frenetic. They have a modified stinger for smearing venom but rarely use it on humans, they prefer to flee. The biggest challenge is their tiny size: they can squeeze through very small gaps, so secure all connections with fine mesh. Colonies grow gradually, so patience is key. Queens are relatively small and can live for several years.

Frequently Asked Questions

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References