Crematogaster brunensis

Quick Summary

• Difficulty: Unknown, Insufficient data for assessment
• Origin & Habitat: Endemic to Borneo (Brunei), found exclusively in lowland dipterocarp forest canopy ^[2]. Collected from fogging samples in tropical rainforest environment.
• Colony Type: Colony structure unconfirmed. Based on genus patterns, likely single-queen (monogyne) colonies.
• Size & Growth:
  • Queen: Undescribed, no queen measurements available
  • Worker: Size data unavailable, partial measurements only (head width 0.43-0.47mm, mesosoma length 0.60-0.63mm) are documented in original description ^[1]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unconfirmed (No development data exists for this species.)
• Antkeeping:
  • Temperature: Keep warm at 24-28°C. These are tropical canopy ants requiring warm, stable conditions. A small heating cable on one side of the nest creates a gentle gradient.
  • Humidity: High humidity required, aim for 70-85%. These forest canopy ants need consistently moist conditions. Use a water reservoir in the nest and mist the outworld regularly.
  • Diapause: No, as a tropical species from Brunei near the equator, they do not require hibernation. Keep colony active year-round.
  • Nesting: In captivity, they do well in small Y-tong (AAC) or plaster nests with narrow chambers scaled to their tiny size. Provide a moist substrate and include small twigs or cavities to mimic their natural arboreal nesting sites. A naturalistic setup with live moss and small branches works well.
• Behavior: Crematogaster ants are known for their defensive behavior, they raise their abdomen (gaster) over their head when threatened, which is how they got the nickname 'acrobat ants'. They can bite and may release formic acid from their gaster as a defense. Workers are active foragers that search for sugar sources and small prey. They are small but can be aggressive when defending their nest. Escape prevention is critical due to their tiny size, use fine mesh barriers and ensure all connections are sealed tightly.
• Common Issues: tiny size means escapes are likely without fine mesh barriers, no captive breeding data exists, wild-caught colonies may have high mortality, high humidity requirements can lead to mold if ventilation is poor, tropical species may struggle if temperature drops below 24°C, small colony size makes them vulnerable to stress, avoid disturbing founding colonies

Nest Preferences

Crematogaster brunensis is an arboreal species that in nature likely nests in small cavities in trees, hollow twigs, or under bark in the forest canopy. In captivity, they do well in small Y-tong (AAC) or plaster nests with chambers scaled to their tiny size. The nest should have a water reservoir to maintain humidity, as these tropical ants need moist conditions. Include small twigs, pieces of bark, or artificial cavities in the outworld to mimic their natural arboreal habitat. A naturalistic setup with live moss, small branches, and epiphytes can help them feel secure. Keep the nest substrate consistently moist but not waterlogged. ^[2]

Feeding and Diet

Like other Crematogaster species, they likely feed on honeydew from aphids and scale insects, plus small insects and sugar sources. In captivity, offer a constant supply of sugar water or honey diluted with water. For protein, provide small live prey like fruit flies, pinhead crickets, or small mealworms. Since they are very small, prey items should be appropriately sized. Feed protein 2-3 times per week, removing any uneaten prey after 24 hours. Sugar sources should be available continuously. Observe your colony to determine their preferences and adjust feeding accordingly.

Temperature and Care

As a tropical species from Brunei near the equator, Crematogaster brunensis requires warm conditions year-round. Keep the nest area at 24-28°C, with a slight gradient allowing workers to regulate their temperature. A small heating cable placed on one side of the nest can help maintain warmth, but avoid direct heat that could dry out the nest. Room temperature may be sufficient if your home stays in this range. They do not require hibernation or cooling periods, keeping them active year-round is best. Monitor colony behavior, if workers cluster near heat sources, increase temperature slightly, if they avoid heated areas, reduce heat. ^[2]

Behavior and Temperament

Crematogaster ants are known for their distinctive defensive behavior, when threatened, workers raise their abdomen over their head like an acrobat, which is how they got their common name. They can bite and may release formic acid as a defensive secretion. Workers are active foragers that will search both the nest and outworld for food. They are small but can be aggressive when defending their colony. Escape prevention is critical due to their tiny size, even small gaps in equipment can allow escapes. Use fine mesh barriers, tight-fitting lids, and check all connections regularly. They do well in colonies but can be stressed by excessive disturbance, especially during the founding stage.

Colony Establishment

Since this species was only described in 2016,there is limited captive breeding data available. If you obtain a founding queen, provide her with a small test tube setup with a water reservoir and keep her in a quiet, dark location at 26-28°C. Do not disturb her during this period. Once workers arrive, you can begin offering tiny amounts of sugar water and small prey. Growth will likely be slow initially, be patient and maintain consistent conditions. Wild-caught colonies may have higher mortality as they adjust to captivity. ^[1]

Frequently Asked Questions

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References