Scientific illustration of Polyrhachis aurita ant - showing key identification features including head, thorax, and gaster.

Polyrhachis aurita

Monogynous Non-Parasitic Queen No Gamergate
Sci. Name
Polyrhachis aurita
Subgenus
Chariomyrma
Tribe
Camponotini
Subfamily
Formicinae
Author
Emery, 1911
Distribution
Found in 1 countries
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Introduction

Polyrhachis aurita is a medium-sized ant native to New Guinea. Workers measure 6.5-7 mm and are almost entirely black and shiny, with pale yellow pubescence on the cheeks and epistoma. They have raised frontal ridges and long, divergent spines on the epinotum, and the body is sprinkled with brown erect hairs on the legs and antennae . This species belongs to the subgenus Chariomyrma and was described by Emery in 1911 .

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Status by country, from Kass et al. 2022 & Wong et al. 2023

Native Invasive Introduced (indoor) Intercepted Unknown
Data Sources
Year Range 2000 - 2026

Quick Summary

  • Difficulty: Medium
  • Origin & Habitat: New Guinea (Australasian region), found in tropical forest environments [1][2]
  • Colony Type: Unconfirmed, based on limited data, but likely monogyne based on Polyrhachis patterns
  • Size & Growth:
    • Queen: Size data unavailable, inferred from Polyrhachis genus as approximately 8-10 mm [2]
    • Worker: 6.5-7 mm [1]
    • Colony: Up to several hundred workers estimated [2]
    • Growth: Moderate, inferred from tropical Polyrhachis patterns [2]
    • Development: Estimated 6-8 weeks at 25-28°C (Development time may vary based on temperature and conditions.)
  • Antkeeping:
    • Temperature: Keep warm, roughly 24-28°C, based on tropical habitat [2]
    • Humidity: Keep substrate consistently moist but not waterlogged, based on humid forest conditions [2]
    • Diapause: No, tropical species do not require hibernation [2]
    • Nesting: In nature, likely in rotting wood or soil cavities, in captivity, use soil-based or plaster nests with moisture retention [2]
  • Behavior: Polyrhachis ants are generally calm and not aggressive. Workers are agile climbers, so escape prevention is important. They forage for protein and carbohydrates [2].
  • Common Issues: escape prevention is critical, they are excellent climbers and will find any gap, tropical species cannot tolerate cold, keep warm year-round, founding phase may be slow, queens take time to raise first workers, wild-caught colonies may carry parasites that can devastate captive colonies, overfeeding can lead to mold problems in the nest

Housing and Nest Setup

You can use a naturalistic setup with soil and organic material as substrate, keeping it moist but not waterlogged. Add leaf litter to maintain humidity and provide cover. Alternatively, use a Y-tong or plaster nest that holds moisture well. Apply Fluon or barriers to prevent escapes since workers are good climbers. For founding colonies, a test tube setup works until the colony has 15-20 workers, then move to a larger setup [2].

Feeding and Diet

Offer protein sources like small insects every few days and constant sugar sources such as honey or sugar water. Remove uneaten food after 24-48 hours to prevent mold. Fresh water should always be available [2].

Temperature and Heating

Maintain temperatures around 24-28°C using a heating cable on one side of the nest to create a gradient. Room temperature alone may be too cool in colder climates. Monitor with a thermometer and avoid temperatures below 22°C [2].

Humidity and Moisture

Keep the nest substrate damp to the touch and provide a water tube or dish. Mist the outworld occasionally but avoid pooling water. Poor humidity can cause failed molts and colony decline [2].

Colony Development

Queens may seal themselves in a chamber while raising the first brood. First workers typically emerge after 6-8 weeks at optimal temperature. Growth is moderate, and full maturity with hundreds of workers may take a year or more [2].

Frequently Asked Questions

How long does it take for Polyrhachis aurita to raise first workers?

Expect 6-8 weeks from egg to first worker at optimal temperature (25-28°C), based on typical Polyrhachis development patterns [2].

Can I keep multiple Polyrhachis aurita queens together?

This species is likely single-queen based on Polyrhachis patterns, but unconfirmed. Combining unrelated queens is not recommended as they may fight.

What temperature do Polyrhachis aurita ants need?

Keep them warm at roughly 24-28°C, as they are adapted to tropical conditions [2].

How big do Polyrhachis aurita colonies get?

Colony size is unconfirmed, but estimated to reach up to several hundred workers based on related species [2].

Does Polyrhachis aurita need hibernation?

No, as a tropical species from New Guinea, they do not require hibernation and should be kept warm year-round [2].

What do Polyrhachis aurita eat?

They are omnivorous. Offer small insects for protein and constant sugar sources like honey water [2].

Are Polyrhachis aurita good for beginners?

This species is rated medium difficulty due to need for warm, humid conditions and escape prevention.

When should I move my Polyrhachis aurita to a formicarium?

Keep founding colonies in a test tube setup until they have 15-20 workers, then move to a larger nest with humidity control [2].

Why are my Polyrhachis aurita dying?

Common causes include temperatures below 22°C, low humidity, mold from overfeeding, or escapes due to poor barrier maintenance.

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References

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This caresheet is licensed under CC BY-SA 4.0 .