Strumigenys dagon

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Rwanda highlands (Rangiro, ~1800 m elevation), forest humus layer ^[2][1]. This is a high-elevation Afrotropical forest species requiring cool, humid conditions.
• Colony Type: Colony structure is unconfirmed. Based on related Strumigenys species, expect small colonies with single queens (monogyne).
• Size & Growth:
  • Queen: Unknown, not yet described ^[1]
  • Worker: 2.0-2.1 mm TL ^[1]
  • Colony: Likely small (under 100 workers) based on typical Strumigenys colony sizes and tiny worker size
  • Growth: Unknown, likely slow given small colony size
  • Development: Unconfirmed, likely 6-10 weeks based on typical Strumigenys development patterns (No specific development data exists for this species. Estimates based on genus-level patterns for small Myrmicinae.)
• Antkeeping:
  • Temperature: Cool conditions needed, aim for 18-22°C given their high-elevation forest origin in Rwanda ^[2]. Avoid temperatures above 25°C.
  • Humidity: High humidity required, they come from forest humus which stays consistently moist. Keep substrate damp but not waterlogged, with humidity around 70-80%.
  • Diapause: Unknown, likely a mild seasonal slowdown given Rwanda's moderate climate, but specific requirements unstudied
  • Nesting: Prefers tight, humid chambers. Test tubes with cotton and a humid outworld work well. The tiny size means they need very small chambers and narrow passages. Naturalistic setups with moist soil/forest floor material mimic their natural humus habitat.
• Behavior: Very small and likely cryptic. Strumigenys are specialized predators using trap-jaw mandibles to capture prey (typically springtails), though this species has unusually short mandibles suggesting potentially different hunting behavior ^[1]. Escape prevention is critical due to their minute size, they can squeeze through the tiniest gaps. Likely shy and not aggressive.
• Common Issues: escape prevention is critical, at 2 mm they can squeeze through gaps that larger ants cannot, high humidity must be maintained or colonies will desiccate, finding appropriate live prey (springtails) can be challenging, slow growth may lead to beginner impatience and overfeeding, wild-caught colonies may have parasites that are difficult to detect

Housing and Nest Setup

Strumigenys dagon requires careful housing due to their extremely small size. Test tube setups work well, use a small test tube with a water reservoir (cotton ball) that provides humidity without flooding. The tube should have a tight-fitting cotton plug that prevents escape while allowing some air flow. Because they are only 2 mm tall, even standard test tube setups may feel spacious to them, but the tight fit of the cotton helps contain them. Some keepers add a small piece of moist plaster or soil to the outworld to maintain humidity. The outworld should be small and simple, a plastic container works fine as long as escape prevention is excellent. Apply Fluon or similar barrier to the rim of any container. Given their forest humus origin, they appreciate having some moist substrate or leaf litter in the outworld to forage through.

Feeding and Diet

Strumigenys dagon is likely a specialized predator like other Strumigenys species. In the wild, most Strumigenys hunt springtails (tiny soil arthropods) using their trap-jaw mandibles. However, S. dagon has unusually short mandibles (MI 8-9), which may indicate different prey or hunting behavior compared to typical Strumigenys ^[1]. For captive care, offer small live prey: springtails are the ideal choice and should be the primary food source. Other tiny arthropods like booklice (psocids), dust mites, or fruit fly larvae may also be accepted. Do not offer large prey, their tiny size means they cannot tackle anything substantial. Sugar sources are unlikely to be accepted given the predatory nature of this genus. Feed small amounts of live prey every few days, removing any uneaten prey after 24 hours to prevent mold.

Temperature and Humidity

This species requires cool, humid conditions reflecting its high-elevation Rwandan forest habitat. Keep the nest area at 18-22°C, avoid any temperatures above 25°C. Room temperature is often ideal for this species. If your room runs warm, consider using a small cooling method or placing the colony in a cooler area of your ant room. Humidity should be high, around 70-80%. The nest substrate (test tube cotton or naturalistic setup) should remain consistently moist but never waterlogged. A small water dish in the outworld helps maintain humidity through evaporation. Avoid placing the colony near heating devices, drafty windows, or air conditioning vents that could cause temperature fluctuations or drying. ^[2]

Handling and Observation

Observing Strumigenys dagon requires patience and good lighting, these are tiny ants that spend much of their time in dark, humid microhabitats. Use a magnifying glass or macro lens for photography. They have a functional sting, but given their tiny size it is not considered medically significant and they are not aggressive. When cleaning the outworld or moving the colony, use gentle techniques, these ants are fragile. Transferring colonies is best done when the colony is small enough to fit in a single test tube. Avoid frequent disturbances as this can stress the colony. Check for escapees regularly, at 2 mm, they can find their way out through surprisingly small gaps.

Growth and Development

Specific development data for S. dagon does not exist. Based on typical Strumigenys patterns and related small Myrmicinae, expect development from egg to first worker to take approximately 6-10 weeks at optimal temperature (around 20°C). Growth is likely slow, with colonies remaining very small (likely under 100 workers even at maturity). The first workers (nanitics) will be tiny, matching the already minute adult size. Do not expect rapid colony expansion, these ants prioritize longevity over rapid growth. Be patient and avoid the temptation to overfeed, which can lead to mold problems in the small, humid setup.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References