Polyrhachis schoopae

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Australia, specifically the Queensland wet tropics region. They are lithocolous (rock‑dwelling) ants that nest in abandoned Polyrhachis turneri nests on rock faces, using silk as nest material ^[2][3].
• Colony Type: Likely single‑queen (monogyne) based on typical Polyrhachis patterns, but not confirmed for this species. Colony structure is otherwise unstudied.
• Size & Growth:
  • Queen: ~8-12 mm (inferred from Polyrhachis genus)
  • Worker: ~5-9 mm (inferred from Polyrhachis genus)
  • Colony: Unknown, related Polyrhachis species can reach several hundred workers
  • Growth: Moderate, estimated from genus‑level data
  • Development: Estimated 6-10 weeks at optimal temperature, based on related Formicinae species (Development time is estimated since specific data for P. schoopae is not available)
• Antkeeping:
  • Temperature: Keep at 24-28 °C. Being from the Queensland wet tropics, they prefer warm, stable conditions. A heating cable on one side of the nest creates a gentle gradient if room temperature is insufficient.
  • Humidity: Keep the nest substrate consistently moist but not waterlogged. Mist the outworld occasionally to maintain humidity. They come from a subtropical climate with regular rainfall.
  • Diapause: Unconfirmed, Australian Polyrhachis from Queensland may reduce activity in cooler months, but true hibernation is not typical. Consider lowering temperatures slightly (to ~20-22 °C) during winter, but avoid drops below 18 °C.
  • Nesting: Lithocolous (rock‑dwelling). Naturally nest in rock crevices and on rock faces, often reusing abandoned nests of other Polyrhachis. In captivity, use a naturalistic setup with flat stones on moist substrate, or a Y‑tong/plaster nest with rough surfaces. They use silk, so providing fine materials (e.g., loose soil) can be beneficial.
• Behavior: Generally docile and non‑aggressive. Active foragers but not particularly territorial. Workers can climb smooth surfaces, so use escape prevention (fluon on rims). As Formicinae, they spray formic acid when threatened, harmless to humans.
• Common Issues: colonies may fail if kept too dry, their rock‑dwelling nature requires stable moisture conditions, stress during founding can cause the queen to fail, avoid disturbance while she raises first workers, wild‑caught colonies may carry parasites that can decimate the colony in captivity, escape prevention is needed, workers can climb glass and smooth surfaces

Housing and Nest Setup

Polyrhachis schoopae is lithocolous, they naturally nest in rock crevices and on rock faces, often reusing abandoned nests of Polyrhachis turneri ^[2][3]. In captivity, use a naturalistic setup with flat stones placed on moist substrate, or a Y‑tong (AAC) nest with rough‑textured chambers. Smooth glass‑only nests are not ideal, they prefer surfaces they can grip. Since they build with silk, adding fine materials like loose soil or sand may encourage natural nest construction ^[2].

Feeding and Diet

Omnivorous. They accept sugar water or honey, and protein sources like small insects (fruit flies, mealworms, small crickets). In the wild they forage for honeydew from aphids and scale insects, plus small arthropods. Offer sugar water constantly and protein 2-3 times per week. Remove uneaten prey after 24 hours to prevent mold. They are not specialized predators, so any appropriately sized live or frozen prey works.

Temperature and Seasonal Care

From the Queensland wet tropics, these ants need warmth. Keep the nest at 24-28 °C for optimal brood development. Use a heating cable on top of the nest (never underneath, to avoid drying). In winter, reduce to ~20-22 °C, but avoid drops below 18 °C. True hibernation is not needed, but they may slow down in cooler months.

Behavior and Colony Dynamics

Relatively docile. Workers are active foragers and readily explore the outworld. They have the characteristic thoracic spines of Polyrhachis. When threatened, they spray formic acid, harmless to humans. Colonies grow gradually over months to years. The founding phase is slow, be patient and avoid disturbing the queen. Queens probably found claustrally, fasting until first workers eclose, but this is unconfirmed for P. schoopae.

Frequently Asked Questions

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References