Tetramorium crepum

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Yunnan province, China ^[1][2]. The climate is temperate to subtropical, exact microhabitat is unknown but likely includes forest edges or disturbed areas where it can nest in soil.
• Colony Type: Likely single-queen (monogyne) based on typical Tetramorium patterns, though colony structure is unconfirmed for this species.
• Size & Growth:
  • Queen: Unknown, inferred from Tetramorium genus: likely around 5-7 mm.
  • Worker: 2.4-3.4 mm ^[1]
  • Colony: Unknown, inferred from Tetramorium genus: up to several hundred workers.
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at optimal temperature, based on Tetramorium genus patterns. Specific data unavailable. (Development depends on temperature and food supply.)
• Antkeeping:
  • Temperature: Keep at 20-24°C with a thermal gradient. This species can tolerate slightly wider ranges, but growth slows outside these values (typical for Tetramorium).
  • Humidity: Keep the nest substrate moist but not waterlogged. A drier outworld is fine. Monitor for mold.
  • Diapause: Likely yes, since it comes from a temperate region, provide a winter rest of 2-3 months at 10-15°C. Reduce feeding during this period.
  • Nesting: Standard test tube setup works for founding. Once established (20+ workers), move to a Y-tong or plaster nest with small, tight chambers. These ants prefer confined, dark spaces.
• Behavior: Calm and non-aggressive. Workers are small and active foragers, making escape prevention critical. Their subfamily (Myrmicinae, tribe Crematogastrini) uses a smearing venom defense rather than piercing stingers. They are unlikely to be aggressive toward keepers.
• Common Issues: escape risk due to small size, use fine mesh and fluon or PTFE barriers, overfeeding can cause mold in the nest, remove uneaten food after 24 hours, test tube flooding during founding, keep water reservoir properly sized and cotton plug intact, wild-caught colonies may carry mites or other parasites, quarantine new colonies, slow colony growth may test patience, focus on stable conditions rather than rushing

Housing and Nest Setup

For founding colonies, use a standard test tube: one‑third water, a cotton plug, and the queen in the dark. She will seal herself in. Once the first workers appear and the colony reaches about 15-20 workers, you can offer a formicarium. Y‑tong or plaster nests with narrow, low chambers suit their size. These ants need excellent escape prevention, they can squeeze through gaps as small as 1 mm. Use very fine mesh and barrier fluids.

Feeding and Diet

Like most Tetramorium, this species is omnivorous. Offer small insects (fruit flies, pinhead crickets, chopped mealworms) twice a week, plus a constant sugar source (honey water or sugar water). Remove leftovers after a day to avoid mold. Freshly killed prey is better accepted than live prey by these small workers.

Temperature and Seasonal Care

Maintain 20‑24°C for active growth. They can tolerate brief dips to 15°C or rises to 28°C, but development slows. Based on their temperate origin, provide a winter diapause of 2‑3 months at 10‑15°C. During this period, reduce feeding and keep the nest cooler but not cold.

Colony Development

Founding behavior is unconfirmed, but based on the genus, it is likely claustral, the queen relies on body reserves until the first workers emerge. Expected egg‑to‑worker time is around 6-8 weeks at optimal temperature (22°C). The first nanitics will be smaller than mature workers. Colony growth is moderate, reaching 50 workers may take several months, and a year or more to reach a few hundred. Steady feeding and stable temperatures are key.

Behavior and Temperament

These are calm, non‑aggressive ants. Workers (2.4-3.4 mm ^[1]) are active foragers but not prone to stinging, they belong to a subfamily that uses a smearing venom rather than a piercing sting. Their small size makes them escape artists, so use fine barriers. They are not territorial and can be kept in multi‑species setups if space permits, but escape risk is the main concern.

Frequently Asked Questions

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References