Crematogaster kojimai

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Cameron Highlands, Peninsular Malaysia, tropical highland region. Nests found in Dischidia astephana plants ^[1][3].
• Colony Type: Colony structure is unconfirmed. Based on genus patterns, likely single-queen colonies, but this has not been documented.
• Size & Growth:
  • Queen: Size data unavailable, no queen measurements have been described for this species
  • Worker: ~2-2.5mm total length, inferred from Crematogaster genus patterns (original description notes head width 0.6-0.71mm) ^[1]
  • Colony: Unknown, likely small colonies based on arboreal nesting habits
  • Growth: Unknown
  • Development: Unknown, estimate 6-8 weeks based on typical Crematogaster development at tropical temperatures (No direct data exists. Related Crematogaster species in tropical Asia typically develop in 6-8 weeks at 25-28°C.)
• Antkeeping:
  • Temperature: Keep warm at 24-28°C, this matches their tropical Malaysian origin. A gentle heat gradient allows them to regulate temperature.
  • Humidity: High humidity preferred (70-85%). Their arboreal nesting in plants indicates they need consistently moist conditions.
  • Diapause: No, being from tropical Malaysia, they do not require a diapause period. Maintain year-round warm conditions.
  • Nesting: Arboreal specialists, they naturally nest in plants. In captivity, a small Y-tong (AAC) or plaster nest with tight chambers works well. Provide climbing structures and ensure humidity is maintained without flooding the nest.
• Behavior: Temperament is typical of Crematogaster, defensive when threatened, capable of raising their gaster and releasing alarm pheromones. They are small but active foragers. Escape prevention is critical due to their tiny size, they can squeeze through standard test tube barriers. Use fine mesh and tight-fitting lids.
• Common Issues: tiny size means escapes are likely without fine mesh barriers, no biological data exists, keepers must experiment with care conditions, arboreal nature may require different setup than ground-nesting ants, high humidity needs can lead to mold if ventilation is poor

Nest Preferences and Housing

Crematogaster kojimai is an arboreal species naturally found nesting in plants (Dischidia astephana) in the Cameron Highlands of Malaysia ^[1]. This means they prefer nests that allow for climbing and elevated positions rather than ground-level setups. In captivity, a small Y-tong or plaster nest with appropriately scaled chambers works well, the chambers should be tight and small since these ants are tiny. Avoid large, open spaces that would make them feel exposed. Because they come from a humid tropical environment, the nest substrate should retain moisture well without becoming waterlogged. Some keepers successfully keep small Crematogaster in test tube setups with cotton-plugged water reservoirs, but monitor for flooding. Provide some climbing structures or branches within the outworld to satisfy their natural arboreal instincts.

Feeding and Diet

Like other Crematogaster species, they are likely omnivorous with a preference for protein sources. In the wild, they probably forage for small insects, honeydew from aphids, and nectar. In captivity, offer a varied diet: small live prey like fruit flies, pinhead crickets, or mealworms (cut to appropriate size), sugar water or honey as an energy source, and occasional protein-rich foods. Feed small amounts every 2-3 days and remove uneaten food to prevent mold. Since nothing is specifically documented about this species' diet, observe what your colony accepts and prefers. Remove any uneaten prey within 24 hours to maintain cleanliness.

Temperature and Humidity

Being from tropical Malaysia, these ants need warm and humid conditions. Maintain temperatures between 24-28°C (75-82°F), this matches their natural highland tropical environment. A slight temperature gradient allows the colony to regulate their own conditions. For humidity, aim for 70-85% relative humidity within the nest. Their arboreal nesting in plants indicates they are adapted to consistently moist conditions. Use a water reservoir in the nest setup and mist occasionally, but ensure adequate ventilation to prevent mold growth. Do not let the nest dry out completely. Since they likely do not require diapause, maintain these conditions year-round.

Behavior and Temperament

Crematogaster kojimai displays typical Crematogaster defensive behaviors. When threatened, they can raise their distinctive heart-shaped gaster over their head in a scorpion-like posture and release alarm pheromones to alert nestmates. They are not particularly aggressive but will defend their nest vigorously if provoked. Workers are small but active and will forage throughout their territory. Escape prevention is critical, at this tiny worker size, they can easily slip through standard barriers. Use fine mesh (at least 0.5mm) on all openings and ensure all connections are sealed. Despite their small size, they are relatively bold foragers and will explore their outworld actively. ^[1]

Colony Establishment

Since this species was only described in 2012 and nothing is known about their biology, establishing a colony requires careful observation and some experimentation ^[2]. If you obtain a founding queen, provide her with a small, humid test tube setup and keep her warm (around 26°C). Based on typical Crematogaster patterns, founding may be claustral (able to survive on stored fat reserves while raising her first brood), but this is not confirmed for this species. The first workers (nanitics) will be very small. Once the colony grows to 10-20 workers, you can transition them to a more permanent nest setup. Be patient, with limited species-specific data, success depends on careful observation of your colony's behavior and adjusting conditions accordingly.

Frequently Asked Questions

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References