Pseudomyrmex duckei

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Neotropical rainforests in Brazil (including Amazonas ^[4] and Pará ^[5]), Costa Rica, Ecuador, French Guiana, Guatemala ^[2], and Colombia ^[3][1]. They inhabit humid lowland and mid-elevation forests.
• Colony Type: Unconfirmed colony structure. Most Pseudomyrmex species are single-queen (monogyne), but some can have multiple queens. Likely monogyne based on genus patterns.
• Size & Growth:
  • Queen: Estimated 9-11mm, inferred from larger Pseudomyrmex species ^[1]
  • Worker: Estimated 6-8mm, inferred from Pseudomyrmex genus ^[1]
  • Colony: Likely several hundred workers, typical for the genus, though specific data for P. duckei is unavailable.
  • Growth: Moderate, based on typical Pseudomyrmex development patterns
  • Development: Estimated 6-10 weeks at warm tropical temperatures (24-28°C), inferred from related Pseudomyrmex species (Development time is unconfirmed for this species and is based on genus-level estimates.)
• Antkeeping:
  • Temperature: Keep at 24-28°C (warm tropical conditions). Room temperature may be too cool, use a heating cable on one side of the nest to create a gradient
  • Humidity: High humidity (70-85%) to match rainforest conditions. Keep the nest substrate consistently moist but not waterlogged. Mist regularly and provide a water source
  • Diapause: Unlikely, as a tropical species, they probably do not require a diapause period. They may slow down slightly during cooler periods but maintain warmth year-round
  • Nesting: Arboreal nesting, provide hollow twigs, stems, or a Y-tong (AAC) nest with narrow chambers. Cork bark setups also work. They prefer tight, narrow spaces that mimic natural cavities
• Behavior: Likely aggressive and territorial, like many Pseudomyrmex species. They have a well-developed sting and will defend their nest vigorously. Workers are active foragers, hunting small invertebrates. Escape prevention is important given their moderate size (6-8mm). They likely have good vision and may be more active during daylight. Based on subfamily/tribe (Pseudomyrmecini), their primary defense is stinging
• Common Issues: tropical rainforest species can struggle in cool, dry indoor environments, specific dietary needs unknown, may require live prey and refuse substitutes, high humidity needs (70-85%) can lead to mold if ventilation is poor, aggressive nature means stings are likely when working with the colony, rarely available in the ant trade, making acquisition difficult

Housing and Nest Setup

Being an arboreal rainforest species, P. duckei naturally nests in hollow twigs, stems, or pre-existing tree cavities. In captivity, mimic this with a Y-tong (AAC) nest that has narrow chambers, a cork bark setup, or natural hollow twigs. The chambers should be sized for workers (6-8mm) and kept tight, they dislike wide open spaces. High humidity is essential, so use a water tube or moisture-retaining substrate. Place the nest in a warm (24-28°C), draft-free area away from direct sunlight.

Feeding and Diet

Like other Pseudomyrmex, P. duckei is likely predatory. Offer small live invertebrates such as fruit flies, pinhead crickets, and mealworms. Protein should be the primary food. You can supplement with sugar water or honey water occasionally. Feed every 2-3 days and remove uneaten prey after 24 hours to prevent mold. Because the species has rarely been kept, experiment with different prey types. Fresh water must always be available.

Temperature and Humidity

This tropical species needs warm, humid conditions: 24-28°C and high humidity (70-85%). Use a heating cable on one side of the nest to create a gradient. Keep the nest substrate consistently moist without flooding. Mist the outworld regularly. A water tube with a cotton plug helps maintain constant humidity. Poor humidity can cause brood failure. Monitor condensation in test tube setups as a humidity indicator.

Behavior and Handling

Pseudomyrmex duckei is aggressive and quick to sting when disturbed, this is typical for the subfamily Pseudomyrmecinae. They have good vision and are active during the day. When working with the colony, use escape-proof barriers and disturb them as little as possible. The sting is painful for its size but not dangerous to healthy humans. They are not a beginner species. Observing their predatory hunts is a highlight of keeping them.

Colony Development

Colony growth is likely moderate. A newly mated queen probably finds a small cavity (hollow twig) and seals herself in to found the colony claustrally, this is the typical pattern for the genus. The first workers (nanitics) will be smaller than mature workers. After emergence, the colony grows steadily. A mature colony likely reaches several hundred workers. The egg-to-worker time is estimated at 6-10 weeks at 24-28°C, but this is unconfirmed. Patience is needed.

Frequently Asked Questions

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References