Polyrhachis militaris

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Sub-Saharan Africa, found in forested regions across West, Central, and East Africa ^[1]. Naturally nests in rotten wood of standing trees ^[2].
• Colony Type: Likely monogyne (single queen) based on typical Polyrhachis patterns, unconfirmed in scientific literature.
• Size & Growth:
  • Queen: ~10-15 mm, inferred from Polyrhachis genus patterns
  • Worker: ~10-15 mm, inferred from Polyrhachis genus patterns
  • Colony: Up to several hundred workers estimated based on genus patterns
  • Growth: Moderate
  • Development: Unknown, no direct data. Based on typical Formicinae development, estimate 6-10 weeks (Development time is unconfirmed for this species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, these are tropical forest ants that need warmth ^[1]. A gentle temperature gradient allows ants to regulate their own conditions.
  • Humidity: Keep the nest substrate consistently moist but not waterlogged. As arboreal wood-nesters, they prefer damp conditions ^[2].
  • Diapause: No, being a tropical species, they do not require hibernation. Maintain consistent warm temperatures year-round ^[1].
  • Nesting: Arboreal nesting species, they need wood-based nesting material. A naturalistic setup with rotten wood pieces or a wooden formicarium works well. They do not use silk in nest building ^[2].
• Behavior: These ants are defensive and will spray formic acid when threatened ^[3]. Workers forage singly across the forest floor, traveling between trees ^[2]. They are large ants with a strong grip, if disturbed on branches, they release their grip and drop to the ground ^[3]. Escape prevention is important but not critical as they are large ants that cannot squeeze through typical ant barriers.
• Common Issues: formic acid spraying, keep away from valued surfaces and handle with care, tropical temperature requirements mean colonies may struggle in cool rooms, arboreal nesting means they need wood-based housing, not standard test tubes, large size requires appropriately sized chambers and passages, potential parasite risk, they can be affected by zombie ant fungus (Ophiocordyceps) in the wild ^[3]

Housing and Nest Setup

Polyrhachis militaris is an arboreal species that naturally nests in rotten wood of standing trees ^[2]. In captivity, they need wood-based housing rather than test tubes or plastic nests. A naturalistic setup with pieces of rotten wood, a wooden formicarium, or an acrylic nest with wood inserts works best. The nest material should be moist but not waterlogged, think damp forest wood, not a swamp.

Because they are large ants, ensure the nest chambers and passages are appropriately sized. They do not use silk to construct nests ^[2], so they will occupy existing cavities in wood rather than building elaborate structures. Provide a water tube as a drinking source, and consider adding small plants or branches in the outworld to simulate their natural arboreal environment.

Feeding and Diet

Polyrhachis militaris is a generalist forager that hunts singly ^[2]. In the wild, they prey on small insects and likely tend honeydew-producing insects. In captivity, offer a varied diet: protein sources like mealworms, small crickets, or other small insects 2-3 times per week. They should also have constant access to sugar water or honey.

As large active ants, they have substantial food requirements. Monitor consumption and adjust feeding frequency based on colony size and activity. Remove uneaten prey after 24-48 hours to prevent mold issues.

Temperature and Humidity

These are tropical forest ants from sub-Saharan Africa, so they need warm and humid conditions ^[1]. Maintain temperatures between 24-28°C with a gentle gradient so workers can choose their preferred zone. Room temperature may be sufficient in warm climates, but most keepers will need a heating cable or mat on one side of the nest.

Humidity should be kept consistent with substrate moisture. As wood-nesting ants, they prefer damp conditions but the substrate should not be waterlogged. Mist the nest occasionally and provide a water tube for drinking. Good ventilation helps prevent mold while maintaining humidity.

Defense and Handling

When threatened, Polyrhachis militaris workers have two dramatic defense responses. First, they curve their gasters beneath the alitrunk and spray formic acid ^[3]. Second, they tap their gasters rapidly against surfaces, producing a distinctive rattling sound, this is audible when multiple workers perform it together ^[3].

When handling these ants or working with the colony, expect formic acid spraying. Work in a well-ventilated area and avoid having the ants crawl on bare skin. If disturbed on branches in the outworld, they may release their grip and drop to the ground, this is a natural escape response ^[3].

Seasonal Care

As a tropical species from sub-Saharan Africa, Polyrhachis militaris does not require hibernation or diapause ^[1]. Maintain consistent warm temperatures year-round. These ants are active throughout the year in their native habitat.

Nuptial flights have been recorded in various months across different regions: Ghana (June, September, October), Nigeria (May), Uganda (January, July, September, October), Kenya (November), Tanzania (February, June) ^[3]. This suggests flights are not strictly seasonal but may occur during warmer/wetter periods.

Frequently Asked Questions

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References