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

Polyrhachis fuscipes

Non-Parasitic Queen No Gamergate
Sci. Name
Polyrhachis fuscipes
Subgenus
Campomyrma
Tribe
Camponotini
Subfamily
Formicinae
Author
Mayr, 1862
Distribution
Found in 1 countries
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Introduction

Polyrhachis fuscipes is a medium-sized Australian ant in the subgenus Campomyrma. Workers measure 7.81-8.87 mm in total length . The species is found in mountainous regions of southeastern New South Wales, the Australian Capital Territory, and south through the Victorian Alps to Tasmania . It nests subterranean, building nests underground with carton material at the entrance . The species was historically confused with Polyrhachis hexacantha and is now recognized as separate, with Polyrhachis hestia as a junior synonym . A notable trait is its subterranean nesting with carton construction, which helps protect the colony from environmental changes .

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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: Mountainous southeastern Australia (NSW, ACT, Victoria, Tasmania) [1]
  • Colony Type: Unconfirmed, likely single-queen colonies based on typical Polyrhachis patterns
  • Size & Growth:
    • Queen: Size data unavailable, no specific measurements for queens
    • Worker: 7.81-8.87 mm [1]
    • Colony: Colony size data unavailable
    • Growth: Moderate, inferred from related species
    • Development: Estimated 8-12 weeks at optimal temperature, inferred from genus patterns (Polyrhachis have pupal cocoons, which may slightly extend development time [4])
  • Antkeeping:
    • Temperature: Keep at 20-24°C, inferred from temperate mountain habitat [1]
    • Humidity: Keep nest substrate consistently moist but not waterlogged, based on subterranean nesting
    • Diapause: Yes, requires winter dormancy due to temperate habitat [1]
    • Nesting: Subterranean nests with carton at entrance [2]
  • Behavior: Generally calm and non-aggressive. Workers have moderate escape risk due to medium size [1]. They lack a sting and defend by spraying formic acid, typical of Formicinae.
  • Common Issues: cold sensitivity, being from alpine areas, they may struggle in warm conditions above 28°C, hibernation failure, improper winter cooling can weaken colonies, slow founding, queens may take extended time to produce first workers, substrate drying, subterranean species need consistent moisture, dry nests cause abandonment, limited availability, this is a rarely kept Australian species

Nest Preferences and Setup

Polyrhachis fuscipes is a subterranean nester, building colonies underground [4]. In captivity, use test tube setups with moist substrate or soil-based nests. The genus constructs carton at nest entrances, so adding organic material can encourage natural behavior [2]. Keep the nest substrate consistently moist but not flooded. Avoid arboreal setups, as this species is not tree-dwelling.

Feeding and Diet

Polyrhachis ants are omnivorous, feeding on honeydew, nectar, and small invertebrates. In captivity, offer sugar water or honey constantly, and protein like fruit flies or mealworms 2-3 times per week. Remove uneaten prey after 24-48 hours to prevent mold. [3]

Temperature and Seasonal Care

Keep nests at 20-24°C, avoiding temperatures above 28°C. During winter, reduce temperature to 10-15°C for 2-3 months to mimic natural dormancy [1]. This is important for colony health.

Behavior and Colony Dynamics

Workers are calm and not aggressive, with moderate escape risk due to their medium size [1]. They defend by spraying formic acid, as they lack a sting. Colonies grow moderately, with queens laying eggs that develop into larvae and cocooned pupae [4].

Growth and Development

Specific development timelines are not documented. Based on genus patterns, expect 8-12 weeks from egg to worker at optimal temperature. Pupal cocoons may slightly extend development time [4]. Founding queens may take months to produce first workers.

Frequently Asked Questions

How long does it take for Polyrhachis fuscipes to produce first workers?

Specific timelines are not documented, but based on genus patterns, expect 8-12 weeks at optimal temperature. Founding can be slow, so be patient with new queens.

What temperature is best for Polyrhachis fuscipes?

Keep them at 20-24°C, inferred from their temperate mountain habitat [1]. Avoid temperatures above 28°C.

Do Polyrhachis fuscipes ants need hibernation?

Yes, as a temperate species, they require winter dormancy. Reduce temperature to 10-15°C for 2-3 months during winter [1].

What do Polyrhachis fuscipes eat?

They are omnivorous. Offer sugar water or honey constantly, and protein like small insects 2-3 times per week.

Are Polyrhachis fuscipes good for beginners?

This is a medium-difficulty species. They are calmer but have specific temperature needs and require hibernation. They are rarely available.

How big do Polyrhachis fuscipes colonies get?

Colony size data is unavailable for this species.

What type of nest is best for Polyrhachis fuscipes?

Subterranean nests with moist substrate and carton at the entrance are best [2].

Can I keep multiple Polyrhachis fuscipes queens together?

Colony structure is unconfirmed. Polyrhachis are typically single-queen, so combining queens is not recommended without evidence.

Where is Polyrhachis fuscipes naturally found?

They are found in mountainous southeastern Australia, including NSW, ACT, Victoria, and Tasmania [1].

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References

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This caresheet is licensed under CC BY-SA 4.0 .