Polyrhachis queenslandica

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Northern Queensland, Australia, and New Guinea. Found in lowland rainforest trees and shrubs where they build silk-woven nests among leaves ^[1][2].
• Colony Type: Colonies have multiple arboreal nests, but the number of queens per colony is unconfirmed ^[2].
• Size & Growth:
  • Queen: ~8.11-9.17 mm ^[1]
  • Worker: ~5.95-6.70 mm ^[1]
  • Colony: Colony size is not documented in the research ^[1].
  • Growth: Moderate
  • Development: Unknown, estimated 8-12 weeks based on typical tropical Polyrhachis development (Pupae are in cocoons, which may extend development time ^[2].)
• Antkeeping:
  • Temperature: Keep warm, roughly 24-28°C, based on tropical habitat.
  • Humidity: Keep humidity high with moist substrate, but avoid waterlogging ^[1].
  • Diapause: No, tropical species do not require hibernation.
  • Nesting: Arboreal specialists need vertical space and climbing opportunities. Provide nests with branches or plants for silk weaving ^[2][1].
• Behavior: Workers are calm and arboreal, excellent climbers. Escape risk is moderate due to size and agility ^[1].
• Common Issues: high humidity maintenance, rainforest species prone to mold in poorly ventilated setups., arboreal nature means they need vertical space, horizontal-only nests lead to stress., silk-weaving behavior requires humidity to work, too dry prevents nest construction., tropical species cannot tolerate cool temperatures, keep above 24°C., wild-caught colonies may be stressed from canopy collection and need time to acclimate.

Nest Preferences and Housing

Polyrhachis queenslandica is an arboreal species that naturally nests in the canopy of rainforest trees, using silk to bind leaves together into protective chambers ^[2][1]. In captivity, they need vertical space and climbing opportunities to express their natural behaviors. A Y-tong (AAC) formicarium works well, but you should add branches, cork bark, or artificial plants to provide climbing structures. Some keepers successfully keep them in naturalistic setups with live tropical plants where the ants can build their silk nests among the leaves. The key is vertical space, they will not thrive in flat, horizontal-only nests. Provide multiple connected chambers at different heights to mimic their multi-nest colony structure ^[2].

Feeding and Diet

Like most Polyrhachis species, P. queenslandica is omnivorous with a diet based on honeydew from sap-sucking insects and small invertebrates. In captivity, offer a varied diet including sugar water or honey as a constant energy source. For protein, provide small insects like fruit flies, small crickets, or mealworms. They are active foragers and will readily take prey back to the nest. Feed protein 2-3 times per week and keep sugar water available at all times. Fresh water should always be accessible. Being a tropical species, they have moderate metabolic demands, avoid overfeeding which can lead to mold issues in their humid setup. ^[2]

Temperature and Seasonal Care

As a tropical species from Queensland and New Guinea, P. queenslandica requires warm temperatures year-round. Keep the nest area at roughly 24-28°C with a slight gradient if possible so workers can thermoregulate. A heating cable on one side of the nest can help maintain warmth, but avoid direct heat that could dry out the nest. They do not require hibernation or diapause, keeping them warm year-round is essential for colony health. Cool temperatures below 22°C can slow activity and may stress the colony. ^[1]

Humidity and Water

P. queenslandica comes from Queensland rainforest habitats and requires high humidity to thrive ^[1]. Maintain high humidity in the nest area by misting regularly and using a water reservoir in your formicarium. The humidity also supports their silk-weaving behavior, too dry and they cannot properly construct their characteristic leaf nests. However, balance humidity with adequate ventilation to prevent mold growth. Provide a water tube or cotton ball with fresh water in the outworld at all times.

Behavior and Colony Structure

This species forms colonies with multiple arboreal nests, but the number of queens per colony is unconfirmed ^[2]. Workers are medium-sized, dark-colored, and relatively calm compared to many aggressive ant species. They are excellent climbers and spend most of their time in the canopy layer. In captivity, they will explore vertical structures and appreciate opportunities to forage at different heights. Pupae are enclosed in cocoons, which is typical for the subgenus Myrmothrinax and adds to their development time ^[2].

Frequently Asked Questions

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References