Indomyrma bellae

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Cat Tien National Park, Southern Vietnam (200m elevation) in old dipterocarp forest with ferralitic soil. Nests in rotting wood ^[1].
• Colony Type: Likely single queen based on the single queen specimen found in a tree butt. Colony size is unknown.
• Size & Growth:
  • Queen: 3.34mm ^[1]
  • Worker: 2.67-2.87mm ^[1]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown (No development data available for this species.)
• Antkeeping:
  • Temperature: Tropical species, keep warm around 24-28°C. Use a heating cable on one side of the nest to create a gentle gradient.
  • Humidity: High humidity required, they come from tropical forest leaf litter. Keep nest substrate consistently moist but not waterlogged. Provide a water tube for drinking water.
  • Diapause: No, being a tropical species, they do not require hibernation. Maintain warm temperatures year-round.
  • Nesting: Natural nesting is in rotting wood. In captivity, a small Y-tong (AAC) nest or plaster nest with tight chambers scaled to their tiny size works well. Avoid large open spaces, they prefer tight, humid chambers.
• Behavior: Very small and cryptic. Workers are slow-moving and forage in leaf litter. They are documented to feed on sugar sources (fallen fruit), which is unusual for Myrmicinae. Their reduced eyes (only 2-3 ommatidia) suggest they rely more on chemical trails than visual navigation. Escape prevention is critical due to their tiny size, they can squeeze through extremely small gaps. They have a stinger but it's too small to affect humans ^[1].
• Common Issues: tiny size means escapes are likely without fine mesh barriers., no captive breeding data exists, wild colonies may have high mortality., humidity control is critical, they dry out quickly., no established feeding protocols, experimental diet required., tropical temperature requirements must be maintained year-round.

Housing and Nest Setup

Indomyrma bellae is an extremely small ant that requires careful housing. In the wild, they nest in rotting wood within old dipterocarp forests, so a naturalistic setup with small pieces of rotting wood or a Y-tong (AAC) nest with very tight chambers works best. The chambers should be scaled to their tiny worker size, avoid tall, open spaces that would make them feel exposed. Plaster nests also work well as they hold humidity. Use fine mesh on any ventilation holes because these tiny ants can escape through gaps you wouldn't believe possible. A test tube setup can work for founding colonies, but be prepared to move them to a proper nest once the colony grows. The key is maintaining high humidity while allowing some ventilation to prevent mold. ^[1]

Feeding and Diet

This species has a unique dietary characteristic among Myrmicinae, they readily accept sugar sources. In the wild, workers were collected using carbohydrate baits from fallen fruits, indicating they forage on sweet substances ^[1]. For captive care, offer sugar water or honey regularly alongside protein sources. For protein, start with small prey items like fruit flies, pinhead crickets, or tiny mealworms. Given their minute size, standard cricket pieces may be too large, chop prey into smaller pieces or culture your own small feeder insects. Observe feeding behavior carefully since there's no established protocol for this species. Always provide a fresh water source, a small water tube with cotton works well.

Temperature and Humidity

Being a tropical species from southern Vietnam, Indomyrma bellae requires warm, humid conditions. Maintain temperatures around 24-28°C year-round, use a heating cable on one side of the nest to create a gentle thermal gradient if your room temperature is below this range. Place the heating on top of the nest, not underneath, to avoid drying out the substrate. Humidity is critical, these ants come from tropical forest leaf litter and will dry out quickly in dry conditions. Keep the nest substrate consistently moist but not waterlogged. A water tube attached to the nest helps maintain humidity and provides drinking water. Monitor for condensation on the nest walls, some condensation is good but excessive moisture leads to mold. ^[1]

Behavior and Colony Care

Indomyrma bellae is a cryptic, slow-moving leaf litter ant. Workers have strongly reduced eyes (only 2-3 ommatidia), suggesting they rely more on chemical pheromone trails than visual cues for navigation ^[1]. Colonies are likely small based on similar leaf litter species. The queen has much better-developed eyes than workers, which is unusual and may relate to her nuptial flight and colony founding behavior. They are not aggressive and likely won't sting humans due to their minute size. The most critical aspect of care is escape prevention, these tiny ants can squeeze through gaps that larger species couldn't fit through. Use fine mesh on all openings.

Frequently Asked Questions

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References