Strumigenys behasyla

Strumigenys behasyla

Strumigenys behasyla is a small predatory ant species native to the Democratic Republic of Congo ^[1]. Like other Strumigenys, this species has distinctive large trap-jaw mandibles that they use to capture prey, when triggered, these mandibles snap shut with incredible speed, making them one of the fastest animals in the animal kingdom relative to their body size. Workers are typically around 3-5mm, with a characteristic elongated head and specialized trap-jaw apparatus. The genus is known for their slow, deliberate movements and their ability to remain motionless for extended periods before striking. These ants are specialized predators, primarily hunting small arthropods like springtails and mites.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Democratic Republic of Congo, IT Province ^[1]. In nature, Strumigenys species typically inhabit humid forest floors, often nesting in rotting wood, leaf litter, or under stones in shaded, damp areas.
• Colony Type: Likely monogyne (single queen) based on typical genus patterns. Founding is likely claustral, the queen seals herself in a chamber and lives off stored fat reserves until her first workers emerge.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 4-6mm based on genus typical sizes, not directly measured for this species
  • Worker: Estimated 3-4mm based on genus typical sizes
  • Colony: Likely small colonies of 50-200 workers based on typical Strumigenys patterns, colonies are typically modest in size
  • Growth: Slow, Strumigenys are generally slow-growing even when established
  • Development: Estimated 8-12 weeks based on related species, this is a slow developer (Development times for Strumigenys are generally longer than many common ant species. First workers (nanitics) are typically smaller than mature workers.)
• Antkeeping:
  • Temperature: Keep at 22-26°C, they prefer warm, stable conditions typical of tropical species. Avoid temperatures below 20°C.
  • Humidity: High humidity is essential, aim for 70-85%. These ants come from humid forest floor habitats and will struggle in dry conditions. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: Likely no true diapause required, Strumigenys are tropical ants that don't experience cold winters. However, slight temperature reduction during winter months may slow activity.
  • Nesting: Y-tong (AAC) nests work well due to their preference for tight, humid chambers. Plaster or acrylic nests with good moisture retention are also suitable. Avoid dry setups.
• Behavior: Strumigenys are fascinating to watch due to their unique hunting behavior. They patrol slowly, often remaining motionless, then snap their mandibles shut when prey is within range. They are not aggressive toward humans and rarely sting. Escape prevention is important as they are small and can squeeze through small gaps. They are peaceful toward colony members and typically don't exhibit major territorial behaviors.
• Common Issues: high humidity requirements mean mold can be a problem if ventilation is poor, slow growth can frustrate beginners who expect fast development, small size makes escape prevention critical, use fine mesh barriers, they are specialized predators and may refuse standard ant foods, live prey is often essential, colonies remain small even when established, which is normal for the genus

Housing and Nest Setup

Strumigenys behasyla requires a setup that maintains high humidity while providing proper ventilation. Y-tong (AAC) nests are excellent choices because they hold moisture well and provide the tight, enclosed chambers these ants prefer. The chambers should be appropriately sized for their small size, avoid large, open spaces. A small outworld area works for feeding. Because they are tiny, use fluon or other barrier methods on the edges of any tube connections to prevent escapes. Test tube setups can work for founding colonies but monitor humidity carefully, they dry out faster than larger setups.

Feeding and Diet

Strumigenys are specialized predators and this species will need live food to thrive. Their trap-jaw mandibles are designed for catching small, fast-moving prey like springtails, which should be their primary food source. Other small live prey such as fruit flies, tiny crickets, and small mealworms may be accepted. Some keepers report that Strumigenys will occasionally accept protein gels or crushed insects, but live prey is far more reliable. Feed small amounts every 2-3 days, removing any uneaten prey after 24 hours. Sugar sources are not typically important for this genus as they are not honeydew feeders.

Temperature and Seasonal Care

Maintain temperatures between 22-26°C year-round. These are tropical ants and will be most active in the warmer end of this range. A small heating cable on one side of the nest can help maintain temperatures, but always provide a gradient so ants can move to cooler areas if needed. Since they come from a region without cold winters, they do not require hibernation. However, slight seasonal variations are natural, you might allow temperatures to drop a few degrees in winter (to around 20°C) which may slow activity but is generally well-tolerated.

Behavior and Observation

One of the most fascinating aspects of keeping Strumigenys is observing their unique hunting technique. Workers patrol slowly and deliberately, often stopping completely for extended periods. When a potential prey item comes within striking range, typically just a few millimeters, their mandibles snap shut with remarkable speed. This is not a chase predator, instead, they ambush their prey. They are generally peaceful within the colony and you may see multiple workers cooperating to subdue larger prey items. They are not defensive toward keepers and their sting is mild if present at all.

Frequently Asked Questions

References