Strumigenys pulchella

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Eastern to midwestern North America, from Canada south to Florida and west to Iowa, Kansas, and Texas. Found in deciduous forests, nesting in hardwood stumps and rotting fallen branches in moist, shaded locations ^[1][4].
• Colony Type: Single-queen colonies (monogyne) – unconfirmed but typical of most Strumigenys. Colony size appears small based on limited field observations.
• Size & Growth:
  • Queen: size data unavailable – AntWiki shows queen images but no measurements
  • Worker: 1.9-2.1 mm ^[2]
  • Colony: Up to 100 workers – inferred from typical Strumigenys colony sizes
  • Growth: Slow
  • Development: Estimated 8-12 weeks based on related Strumigenys species and typical Myrmicinae development at warm temperatures (Development is likely slow given their ambush predatory lifestyle and small colony size)
• Antkeeping:
  • Temperature: 20-24 °C – they prefer warmth but not direct heat. Provide a gradient so workers can choose. Avoid temperatures above 28 °C ^[2]
  • Humidity: High, but not waterlogged. Keep the nest substrate consistently moist – think damp rotting wood, not swamp. The nest should feel cool and damp to the touch ^[2]
  • Diapause: Yes – a temperate species requiring winter hibernation. Reduce temperature to 10-15 °C for 3-4 months (November to February) ^[2]
  • Nesting: Use a naturalistic setup with pieces of rotting hardwood or a Y-tong (AAC) nest with tight chambers. Avoid tall, open spaces – these ants feel safest in small, enclosed crevices. A test tube works for founding and small colonies. Never use acrylic nests – they don't hold humidity well and these ants need constant moisture ^[2]
• Behavior: Extremely docile and non-aggressive. Workers are slow-moving and spend most of their time motionless, waiting to ambush prey. They possess a functional stinger but it is not medically significant to humans. Escape prevention is critical – at 2 mm, they can squeeze through tiny gaps. Use fine mesh on all openings and apply fluon or petroleum jelly to barrier edges. They are strictly predatory, hunting springtails and other micro-arthropods ^[2].
• Common Issues: tiny size makes escapes likely without fine mesh barriers (use 0.5 mm mesh or silicone)., predatory diet requires live springtail cultures – they rarely accept dead prey and never eat sugar or honey., high humidity without ventilation leads to mold and colony death – ensure airflow while maintaining moisture., slow colony growth and small final size may discourage keepers expecting fast development., wild-caught colonies often stressed – source from captive breeders if possible.

Housing and Nest Setup

Strumigenys pulchella needs appropriately scaled housing. A naturalistic setup with pieces of rotting hardwood works best since this mimics their natural habitat – they nest in rotten wood at the red or chocolate crumbling stage ^[2]. You can also use a Y-tong (AAC) nest or a well-humidified plaster nest with tight chambers. The key is maintaining consistently high humidity without waterlogging. Place a water reservoir connected to the nest area to provide moisture. Because they are so small, even standard test tube setups can work if you use a small-diameter tube and keep it humidified. Avoid tall, open spaces – these ants feel safest in tight, enclosed crevices. Never use acrylic nests – they don't hold humidity well and these ants need constant moisture ^[2].

Feeding and Diet

These ants are strict predators and will not accept sugar water, honey, or seeds. Their primary prey in the wild is springtails, and you should culture live springtails as a primary food source. They are ambush predators – workers find a good vantage point, crouch motionless, and wait for prey to wander close. When a springtail touches the front of their head, they snap their mandibles shut ^[2]. After starvation, they may accept small pieces of dead flies, but live prey is always preferred ^[2]. Feed springtails or other micro-arthropods (like booklice) 2-3 times per week. Remove uneaten prey after 24-48 hours to prevent mold. Workers have been observed carrying dead springtails in their mandibles in the wild ^[2].

Temperature and Seasonal Care

Keep your colony at 20-24 °C, with a slight gradient so workers can choose their preferred temperature. They naturally live in warm but shaded forest floor environments, so avoid direct heat sources and bright lighting ^[2]. During winter, they require a hibernation period of 3-4 months at 10-15 °C. This mimics their natural cycle in eastern North America ^[2]. Reduce feeding during hibernation and keep the nest slightly drier but not completely dry. In mid-August, you may see winged reproductives in established colonies – this is their nuptial flight period in the wild ^[2].

Behavior and Handling

Strumigenys pulchella is one of the most docile ant species you can keep. Workers are slow-moving and non-aggressive. They possess a functional stinger, but it is not medically significant and you will likely never see it used defensively – they rely on their mandibles for prey capture, not stinging ^[2]. Their hunting strategy is purely ambush-based: they find a crevice or corner, crouch motionless, and wait. They may wait hours at a time for a springtail to wander by ^[2]. This means they are fascinating to watch but not particularly active. Colonies are small and quiet. The main behavioral concern is escape – at 2 mm, they can slip through the tiniest gaps. Use fine mesh on all openings and apply fluon or petroleum jelly to barrier edges. Despite their small size, they are not skittish and can be observed closely without fleeing.

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