Strumigenys acarai

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Acarai Mountains, Upper Takutu-Upper Essequibo region, southern Guyana. Collected from leaf litter in primary upland forest at 1069m elevation ^[1].
• Colony Type: Unconfirmed, only worker caste known, colony structure not documented. Queen caste has not been described.
• Size & Growth:
  • Queen: Unknown, queen caste has not been described ^[1]
  • Worker: 1.62-1.79mm total length ^[1]
  • Colony: Unknown, only worker specimens collected, no colony size data available
  • Growth: Unknown, growth rate has not been studied
  • Development: Unknown, development timeline has not been documented for this species. Based on related tiny Myrmicinae, estimate 6-10 weeks at optimal temperature. (Estimate based on genus-level data for small Myrmicinae. No direct species-specific studies exist.)
• Antkeeping:
  • Temperature: Based on the tropical upland forest habitat, keep temperatures warm and stable, roughly 22-26°C. No exact optima confirmed ^[1].
  • Humidity: Maintain very high humidity. Keep nest substrate moist but not waterlogged. This leaf-litter species requires high moisture levels ^[1].
  • Diapause: No, being a tropical species from Guyana, true diapause is not required ^[1].
  • Nesting: Use a naturalistic setup with moist leaf litter, or a well-hydrated plaster nest with very small chambers. Escape prevention is critical, use ultra-fine mesh (less than 0.5mm openings) on all ventilation. Test tube setups with a small diameter tube can work if kept humid.
• Behavior: Workers are tiny, specialized predators that likely hunt small soil arthropods. They possess a functional stinger (typical of Myrmicinae), but are not aggressive towards keepers and primarily hide in the substrate. Escape prevention is critical due to their minute size, they can squeeze through gaps that larger ants cannot.
• Common Issues: escape prevention is critical, they are extremely tiny and will escape through any gap larger than 0.5mm., high humidity requirements make them prone to mold if ventilation is poor., specialized diet means they may refuse standard ant foods, live prey is essential., slow colony growth can frustrate keepers expecting rapid development., wild-caught colonies may carry parasites that can decimate the colony.

Housing and Nest Setup

Strumigenys acarai requires careful housing due to its extremely small size. Use nests with very tight chambers and narrow passages, standard ant nest designs may be too large. A naturalistic setup with moist leaf litter works well, replicating their natural habitat in Guyana's forest floor. Alternatively, a small plaster or 3D-printed nest with chambers scaled to their tiny size can work. The key is maintaining high humidity while preventing flooding. Use a water reservoir connected to the nest via cotton or foam to provide moisture without direct water contact. Cover any ventilation holes with ultra-fine mesh (less than 0.5mm openings), these ants can escape through standard ant mesh. Test tube setups can work if you use a very small diameter tube and keep the cotton well-hydrated ^[1].

Feeding and Diet

Strumigenys species are specialized predators that hunt tiny soil arthropods. In captivity, offer small live prey such as springtails, tiny mites, and fruit fly larvae. These ants have minute mandibles and cannot tackle large prey. Some Strumigenys species accept protein gels or crushed insects, but live prey is preferred. Feed small amounts every 2-3 days and remove uneaten prey promptly to prevent mold. Sugar sources are unlikely to be accepted, these are obligate predators. The specialized diet makes them challenging to keep, and success often depends on establishing a culture of appropriate live prey ^[1].

Temperature and Humidity

Maintain temperatures in the 22-26°C range, mimicking the warm, stable conditions of Guyana's upland forests. A slight temperature gradient allows the colony to self-regulate. High humidity is critical, keep the nest substrate moist but not waterlogged. Use moist substrate and consider a water reservoir to maintain humidity levels. However, balance humidity with adequate ventilation to prevent mold growth, which can quickly kill these tiny ants. Avoid temperature fluctuations and drafts. Room temperature within this range is acceptable, use a heating cable only if your room falls below 22°C ^[1].

Behavior and Colony Dynamics

This species is known only from worker specimens collected in leaf litter samples, meaning colony dynamics have not been directly observed. Based on genus behavior, workers likely forage individually or in small groups, using chemical recruitment to coordinate attacks on prey. Their tiny size and vestigial eyes suggest they are primarily chemosensory hunters, not visually oriented. Colonies are probably small, possibly under 100 workers given the small worker size and typical Strumigenys colony sizes. Workers are not aggressive and will flee rather than attack threats. They do possess a functional stinger, but it is unlikely to be used against keepers. The main defense is staying hidden in the nest substrate ^[1].

Finding and Acquiring Colonies

This species is not available in the antkeeping hobby. It is only known from the type series collected in Guyana's Acarai Mountains. There are no documented cultures in captivity. Obtaining a colony would require specialized collecting expeditions to Guyana, which would need proper permits. For most antkeepers, this species remains a scientific curiosity rather than a realistic keeping option. Consider related and more commonly kept Strumigenys species if you are interested in the dacetine ant experience ^[1].

Frequently Asked Questions

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References