Polyrhachis penelope

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Queensland, Australia, with distribution from Rockhampton to Cairns, and also in New Guinea and New Britain. Inhabits open eucalypt forests and woodlands, nesting in the ground ^[1][2][3].
• Colony Type: Unconfirmed, no specific data on queen number or social structure.
• Size & Growth:
  • Queen: ~8.52 mm ^[1]
  • Worker: 6.50-7.61 mm ^[1]
  • Colony: Unknown, no published data on colony size
  • Growth: Moderate, inferred from typical Polyrhachis patterns
  • Development: Estimated 6-10 weeks at optimal temperatures, based on genus-level patterns (Development time depends on temperature, direct data unavailable for this species)
• Antkeeping:
  • Temperature: Keep between 22-26°C with a gentle gradient, as they are from subtropical areas
  • Humidity: Provide a humidity gradient, mostly dry nest chamber with one small moist area, as they are ground-nesting in open forests
  • Diapause: Yes, provide a cool period of 2-3 months during winter at 15-18°C, based on geographic range
  • Nesting: Ground-nesting species, accept test tubes for founding and Y-tong or plaster nests for established colonies ^[1]
• Behavior: Workers are generally calm and non-aggressive. As Formicinae, they can spray formic acid as a defense mechanism. Escape risk is moderate due to their size, standard barriers work well.
• Common Issues: ground-nesting behavior requires deeper nest chambers than arboreal species., this species is uncommon in its native range, making queen acquisition challenging ^[3]., diapause management is important for temperate species to maintain colony health., limited research means care is based on genus-level inference rather than species-specific data.

Nest Preferences and Setup

Polyrhachis penelope is a ground-nesting species that naturally establishes nests in soil, often beneath rocks or in rotting wood ^[1]. In captivity, use a test tube setup for colony founding, a standard test tube with a water reservoir secured with cotton. Once the colony has several workers, transition to a Y-tong or plaster nest with appropriate chambers for their moderate size. Provide a foraging area that allows typical foraging behavior.

Feeding and Diet

As a Formicinae species, Polyrhachis penelope is likely omnivorous. Offer small insects like fruit flies or mealworms as protein sources 2-3 times per week, and keep sugar water or honey water available constantly. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Seasonal Care

Maintain nest temperatures around 22-26°C for optimal brood development, based on their subtropical distribution. During winter, provide a diapause period at 15-18°C for 2-3 months to match their natural cycle.

Behavior and Handling

Workers are calm and moderately active. They possess an acidopore and can spray formic acid when threatened, but this is rarely a concern for keepers. Escape prevention is straightforward with standard barriers due to their size.

Colony Establishment

Start with a freshly mated queen in a test tube setup. Do not disturb her during the founding period, which may last several weeks. Once workers emerge, connect to a foraging area. Wait until the colony is actively foraging before moving to a permanent nest.

Frequently Asked Questions

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References