Adetomyrma goblin

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Madagascar (Fianarantsoa region), specifically in rainforest transitioning to montane forest at 600m elevation, nesting in rotten logs and soil ^[1].
• Colony Type: Unknown, likely single-queen colonies given the presence of alate queens, but colony structure is unconfirmed.
• Size & Growth:
  • Queen: Approximately 2-2.5mm total length, inferred from mesosoma measurements (WL 0.9-0.99mm) ^[1].
  • Worker: Approximately 1-2mm total length, inferred from mesosoma measurements (WL 0.39-0.83mm) ^[1].
  • Colony: Unknown, likely small based on genus patterns.
  • Growth: Unknown, likely slow to moderate.
  • Development: Unknown, temperature-dependent development expected for tropical species. (Development timeline is unconfirmed for this species.)
• Antkeeping:
  • Temperature: 22-26°C stable, tropical rainforest conditions. Avoid fluctuations.
  • Humidity: High humidity required, nest substrate should be consistently moist but not waterlogged, mimicking damp rainforest soil and rotting wood ^[1].
  • Diapause: No, this is a tropical species from Madagascar that does not experience winter.
  • Nesting: Naturalistic setup with soil, rotting wood, and leaf litter. Tight-fitting chambers preferred. Avoid open spaces ^[1].
• Behavior: Blind workers rely entirely on touch and chemical cues. They are cooperative hunters that work together to subdue linear prey like centipedes and millipedes ^[2]. Extremely small size means escape prevention must be exceptional, they can fit through the tiniest gaps. Generally slow-moving and cryptic, spending much time hidden in soil or wood.
• Common Issues: escape prevention is critical, workers are minute and can squeeze through gaps invisible to the naked eye., sourcing appropriate prey is difficult, they require linear arthropods like small centipedes or elongated insect larvae, not standard ant food., blind workers are sensitive to environmental changes and may struggle to find food if the setup is too large or complex., founding behavior is unconfirmed, queens may fail without specific conditions we do not yet understand., colonies likely remain small and grow slowly, requiring patience and careful feeding to avoid overfeeding or underfeeding.

Hunting Behavior and Feeding

Adetomyrma goblin are specialized cooperative hunters. Workers are completely blind and hunt in groups to capture linear arthropods, elongated prey like centipedes, millipedes, and insect larvae ^[2]. In captivity, this presents a significant challenge. You cannot feed them standard ant foods like honey water alone or dead insects.

Instead, you must provide small, soft-bodied linear prey. Suitable options include tiny centipedes, small moth larvae, or pieces of larger prey cut into strips. The key is that the prey must be elongated and manageable for ants under 2mm. Because they hunt cooperatively, always ensure multiple workers are present to feed effectively, a lone worker may struggle with prey items.

Offer food 2-3 times per week, removing uneaten items before they mold. Since they are blind, place food directly in their foraging area or near nest entrances. They locate prey through tactile and chemical cues, so disturbance of the substrate helps them detect prey movement.

Nest Setup and Substrate

In nature, Adetomyrma goblin nests in rotten logs and soil in rainforest habitats ^[1]. Replicate this with a naturalistic setup rather than a standard formicarium. Use a container with a soil and leaf litter substrate, pieces of soft rotting wood, and bark.

The nest area should have tight spaces, small tunnels in soil or under bark pieces. Avoid tall, open chambers where these tiny ants cannot climb effectively. The substrate must stay consistently moist but not waterlogged. Think damp forest floor, not swamp.

Because they are blind and cryptic, provide plenty of hiding spots. They will spend most of their time hidden in soil or under wood, emerging to hunt when prey is detected. A clear viewing area is less important than appropriate microhabitat for this species.

Temperature and Humidity Control

As a tropical Madagascar species, Adetomyrma goblin requires stable warm temperatures between 22-26°C. Avoid temperature drops below 20°C. Unlike temperate ants, they do not need and should not receive any winter hibernation or cooling period.

Humidity is critical. The nest substrate should feel damp to the touch at all times. You can achieve this by mixing water into the substrate before adding it to the enclosure, and occasionally misting the surface when it begins to dry. However, ensure there is no standing water that could drown these tiny ants.

Ventilation must be balanced, enough to prevent mold in the damp substrate, but not so much that the enclosure dries out quickly. Small air holes covered with fine mesh work well. ^[1]

Colony Founding and Queen Care

The founding behavior of Adetomyrma goblin is unconfirmed. Most Amblyoponinae ants are semi-claustral, meaning the queen must leave the nest to hunt during the founding stage. However, this species produces alate (winged) queens, which often suggests claustral founding (sealed chamber, living on fat reserves) ^[1].

Until founding behavior is documented, assume queens may need to forage. Provide a small founding setup with both a secure chamber and access to a tiny foraging area with micro-prey. Do not seal queens in completely without food unless you are certain they are claustral.

Queens are known to be alate (winged) in this species, unlike other Adetomyrma which produce wingless queens ^[1]. This suggests they may undertake nuptial flights, though the timing is unknown. If you obtain a dealate (post-flight) queen, treat her carefully and offer food options immediately.

Escape Prevention and Handling

At approximately 1-2mm in length, Adetomyrma goblin workers are escape artists ^[1]. Standard barriers like petroleum jelly may not stop them. You need excellent escape prevention: tight-fitting lids with no gaps, fine mesh screening (they can pass through standard window screen), and Fluon or PTFE barriers applied carefully to all interior surfaces.

Handle the enclosure minimally. These ants are blind and cryptic, and disturbance can disrupt their hunting behavior and colony organization. When you must open the enclosure, work over a large white tray or sheet so you can spot any escapees immediately.

Do not attempt to handle individual ants, they are too small and fragile. If you need to move the colony, cool them slightly (not below 18°C) to slow them down first, or use a light suction device designed for tiny insects.

Frequently Asked Questions

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References