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

Polyrhachis senilis

Non-Parasitic Queen No Gamergate
Sci. Name
Polyrhachis senilis
Subgenus
Chariomyrma
Tribe
Camponotini
Subfamily
Formicinae
Author
Forel, 1902
Distribution
Found in 1 countries
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Introduction

Polyrhachis senilis is an ant species native to Australia, belonging to the subgenus Chariomyrma . It is found in the Torresian biogeographic region and inhabits subterranean and lignicolous environments . Size data is unavailable from current research. This species is part of the Subordinate Camponotini functional group, known for arboreal habits and peaceful behavior .

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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: Northern Australia, Torresian region [2], in subterranean and lignicolous habitats [3].
  • Colony Type: Unconfirmed, no specific data on queen number.
  • Size & Growth:
    • Queen: ~10-12mm (inferred from Polyrhachis genus)
    • Worker: ~6-9mm (inferred from Polyrhachis genus)
    • Colony: Up to several hundred workers (estimated from Polyrhachis genus patterns)
    • Growth: Moderate (inferred)
    • Development: Estimated 6-8 weeks (inferred from related species) (Pupae develop in cocoons [3]. Timeline is estimated as no specific data available.)
  • Antkeeping:
    • Temperature: Keep warm, roughly 24-28°C, based on tropical range [2].
    • Humidity: Keep nest substrate consistently moist but not waterlogged [3].
    • Diapause: Unknown, no data on diapause requirements.
    • Nesting: Subterranean/lignicolous [3]. Use Y-tong or plaster nests with soil or wood substrate.
  • Behavior: Generally peaceful and subordinate, avoiding conflict [2][4]. Workers are arboreal foragers. Defense mechanism: spray formic acid, typical of Formicinae.
  • Common Issues: incorrect humidity can cause brood death or mold growth., wild-caught colonies may carry parasites that threaten colony health., escape risk is moderate due to arboreal habits, ensure secure barriers.

Housing and Nest Setup

Polyrhachis senilis requires a setup that accommodates their subterranean and lignicolous nesting preferences. A Y-tong nest with a soil chamber or a plaster nest works well [3]. Provide an outworld with climbing materials like cork bark for their arboreal habits. Ensure secure connections and use fluon for escape prevention.

Temperature and Heating

Maintain warm temperatures around 24-28°C, as this species is from a tropical region [2]. Use a heating cable if room temperature is low, but avoid direct heat under water reservoirs.

Feeding and Diet

Polyrhachis ants are omnivorous, feeding on honeydew, nectar, and small insects [5]. Offer sugar water or honey constantly, and protein prey like fruit flies 2-3 times per week.

Humidity and Water

Keep the nest substrate consistently moist but not waterlogged [3]. A water test tube helps maintain humidity and provides drinking access.

Colony Development

Pupae develop in cocoons, which requires stable humidity [3]. First workers may emerge in 6-8 weeks, but this is estimated. Colony growth is moderate.

Behavior and Temperament

Workers are peaceful and subordinate, avoiding conflict with dominant species [2][4]. They are arboreal foragers and use formic acid spray for defense, typical of Formicinae.

Frequently Asked Questions

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

Estimated 6-8 weeks from egg to first worker at optimal temperature, based on related species [3].

What do Polyrhachis senilis ants eat?

They are omnivorous. Offer sugar water or honey constantly, and protein prey like small insects [5].

What temperature do Polyrhachis senilis need?

Keep them warm at 24-28°C, based on their tropical range [2].

Are Polyrhachis senilis good for beginners?

They are rated medium difficulty due to specific humidity and temperature needs.

How big do Polyrhachis senilis colonies get?

Colonies can reach up to several hundred workers, estimated from genus patterns.

What type of nest should I use for Polyrhachis senilis?

Use a Y-tong or plaster nest with soil or wood substrate, as they are subterranean/lignicolous [3].

Do Polyrhachis senilis need hibernation?

Diapause requirements are unknown for this species.

Can I keep multiple queens together?

Colony structure is unconfirmed, no data on multiple queens.

Why are my Polyrhachis senilis dying?

Common causes include incorrect humidity, parasites from wild-caught colonies, or escape due to arboreal habits.

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References

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This caresheet is licensed under CC BY-SA 4.0 .