Strumigenys tenuissima

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Western Palaearctic region: confirmed in France and Greece (Corfu island) ^[1]. Based on habitat preferences of related Strumigenys species, they likely inhabit damp, shaded environments such as leaf litter, rotting wood, or soil cavities in forested areas.
• Colony Type: Colony structure is unconfirmed. Most Strumigenys are monogyne (single queen) but some species can have multiple queens. No specific data exists for this species.
• Size & Growth:
  • Queen: Unknown, undescribed in scientific literature. Inferred from genus patterns, queens are typically slightly larger than workers, perhaps 3-4mm, but this is speculation.
  • Worker: 2.0mm total length ^[1]
  • Colony: Unknown, likely small, typically under 100 workers based on genus patterns
  • Growth: Unknown, likely slow like other Dacetini species
  • Development: Unknown for this species. Estimated 8-12 weeks based on related Strumigenys/Dacetini species at optimal temperature ^[1] (Development time is unconfirmed. Dacetini ants often develop slowly due to specialized predatory lifestyle and small colony sizes.)
• Antkeeping:
  • Temperature: Keep at stable room temperature (18-24°C). Start around 20-22°C and observe colony activity. Based on genus patterns, these ants prefer moderate, stable temperatures typical of shaded forest floor microhabitats.
  • Humidity: High humidity required, aim for consistently moist conditions. Keep the nest substrate damp but not waterlogged, with some drier areas so ants can self-regulate. This is inferred from their likely leaf litter habitat.
  • Diapause: Unknown for this species. As a Palaearctic species from southern Europe, it may benefit from a cooler winter period (around 10-15°C for 2-3 months), but this is unconfirmed.
  • Nesting: Use a test tube setup for founding and small colonies. For larger colonies, a Y-tong (AAC) or plaster nest with narrow chambers scaled to their tiny size is ideal. They prefer dark, humid nesting sites with tight spaces. Avoid tall, open chambers.
• Behavior: Strumigenys are specialized predators that use trap-jaw mandibles to capture small prey like springtails ^[1]. Workers are slow-moving and secretive, foraging individually. They have a functional stinger (subfamily Myrmicinae) but are not aggressive toward humans. Their minute size (2mm) makes escape prevention critical, they can squeeze through very small gaps.
• Common Issues: escape prevention is critical, their tiny 2mm size allows them to squeeze through standard mesh barriers., slow growth and small colony sizes make them vulnerable to stress and disturbance., specialized diet means they may refuse standard ant foods, live springtails are likely essential., wild-caught colonies may have parasites that are difficult to treat in captivity., overheating or drying out quickly kills these humidity-dependent ants., very little is known about this species, so care advice is provisional and may need adjustment.

Housing and Nest Setup

Due to their extremely small size, Strumigenys tenuissima requires careful housing. A test tube setup works well for founding colonies: use a small test tube with a cotton water reservoir, kept horizontal so the queen can retreat to the moist end ^[1]. For established colonies, a small Y-tong (AAC) or plaster nest with chamber heights scaled to their tiny size is ideal. Keep passages narrow, these ants feel secure in tight spaces and may abandon large, open chambers. Cover the nest to keep it dark. The outworld should also be appropriately scaled and well-sealed.

Feeding and Diet

Strumigenys species are specialized predators, primarily hunting springtails (Collembola) and other tiny micro-arthropods ^[1]. This is likely essential for Strumigenys tenuissima as well. In captivity, you should culture live springtails specifically for feeding, this is the most reliable food source for Dacetini ants. Other small prey like booklice (psocids) and fruit flies may be accepted experimentally. Sugar sources are rarely accepted by this genus, they are obligate predators. Feed small prey items every few days, removing uneaten prey after 24 hours to prevent mold.

Temperature and Seasonal Care

Keep the colony at stable room temperature, ideally around 20-22°C. Avoid temperature extremes, these ants from the Palaearctic region do not tolerate heat well. A gentle gradient can be offered by placing the nest near (but not directly on) a low-output heat source. As a species from southern Europe (Greece), it may have lower diapause requirements than northern species, but some winter slowdown is expected. Reduce temperature to around 10-15°C for 2-3 months in winter (November to February) to simulate natural conditions, but this is unconfirmed. Do not feed during deep diapause.

Humidity and Water

High humidity is essential. The nest substrate should remain consistently moist, think damp forest floor conditions. For test tube setups, ensure the water reservoir is adequate but not so large that flooding becomes a risk. For plaster or Y-tong nests, check regularly that the hydration reservoir is filled and the nest material hasn't dried out. Avoid waterlogging: provide both moist and slightly drier areas so ants can self-regulate. Condensation on nest walls is a good sign.

Handling and Colony Maintenance

Minimize disturbance, these shy ants are easily stressed. Avoid frequent nest inspections. When moving the colony, coax workers into a container gently rather than shaking. Escape prevention is absolutely critical: use fluon (PTFE) barrier on the outworld rim, and ensure any mesh barriers are fine enough to contain 2mm ants. Standard ant mesh may be too coarse, use fabric mesh or fine insect screen. Colony growth will be slow, so patience is essential. Do not combine with other species.

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