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

Polyrhachis decipiens

Monogynous Non-Parasitic Queen No Gamergate
Sci. Name
Polyrhachis decipiens
Subgenus
Myrma
Tribe
Camponotini
Subfamily
Formicinae
Author
Roger, 1863
Distribution
Found in 1 countries
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Introduction

Polyrhachis decipiens is a medium-sized ant species in the Polyrhachis relucens species-group, subgenus Myrma. Workers have a distinctive spiny appearance and robust build. Size data is unavailable for this species. It is native to Indonesia, including Sulawesi and Batjan Island, in tropical forest habitats . The species was described by Roger in 1863 and confirmed as a valid species separate from its synonyms Polyrhachis restituta and Polyrhachis conclusa . These ants belong to the Formicinae subfamily, which lacks a functional stinger; they defend themselves by biting and spraying formic acid.

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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: Native to Indonesia, specifically Sulawesi and Batjan Island, in tropical forest environments [1][2].
  • Colony Type: Based on Polyrhachis patterns, likely monogyne (single queen) colonies.
  • Size & Growth:
    • Queen: Size data unavailable, inferred from Polyrhachis genus approximately 10-12 mm
    • Worker: Size data unavailable, inferred from Polyrhachis genus approximately 6-8 mm
    • Colony: Up to several hundred workers inferred from genus patterns
    • Growth: Moderate, inferred from related Polyrhachis species
    • Development: Estimated 6-8 weeks at optimal temperatures, inferred from genus patterns [3] (Development time may vary based on temperature and conditions)
  • Antkeeping:
    • Temperature: Keep at 24-28°C, inferred from tropical habitat [3]
    • Humidity: Maintain moderate to high humidity, keep nest substrate consistently moist but not waterlogged [3]
    • Diapause: No, as a tropical species, no hibernation required [1][2]
    • Nesting: Prefer nests in wood, hollow twigs, or under bark, inferred from Polyrhachis nesting preferences [3]
  • Behavior: Polyrhachis decipiens is moderately active and defensive. Workers bite and spray formic acid when threatened. Escape risk is moderate due to medium size, inferred from genus patterns.
  • Common Issues: tropical species may struggle in cool or dry conditions, monitor temperature and humidity closely., colonies may be slow to establish, patience is required during the founding stage., semi-arboreal nature means they need vertical space and appropriate nesting sites., wild-caught colonies may carry parasites or pathogens that can cause colony failure., overfeeding can lead to mold issues in the nest, remove uneaten food promptly.

Housing and Nest Setup

Polyrhachis decipiens does well in a Y-tong (AAC) nest or a plaster formicarium with appropriately sized chambers. Since they are semi-arboreal, include vertical elements and ensure narrow chambers for security. A test tube setup can work for founding colonies, but move them to a permanent setup once the colony reaches 20-30 workers. Provide an outworld for foraging and waste disposal. The nest should retain moisture well without waterlogging [3].

Feeding and Nutrition

These ants are omnivorous. Offer small insects like fruit flies or crickets as protein 2-3 times per week, and provide a constant sugar source like sugar water or honey. Remove uneaten prey after 24-48 hours to prevent mold [3].

Temperature and Humidity Management

As a tropical species, maintain temperatures between 24-28°C with a gentle gradient using a heating cable. Humidity should stay moderate to high, keep the nest substrate moist but not waterlogged. Monitor and adjust as needed [3].

Colony Development and Growth

Colony growth is moderate. A newly mated queen may seal herself in a chamber and lay eggs. First workers typically emerge within 6-8 weeks under optimal conditions, though this is estimated from related species. Colony size depends on temperature, feeding, and humidity stability [3].

Behavior and Handling

Workers are moderately aggressive and defend their nest by biting and spraying formic acid, which can irritate skin. They are active foragers but should be disturbed minimally during founding. Escape prevention is adequate for medium-sized ants [3].

Frequently Asked Questions

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

From egg to first worker, expect approximately 6-8 weeks at optimal tropical temperatures (24-28°C), inferred from genus patterns [3].

What do Polyrhachis decipiens ants eat?

They are omnivorous. Feed small insects like fruit flies 2-3 times per week and provide a constant sugar source like sugar water [3].

Do Polyrhachis decipiens ants need hibernation?

No. As a tropical species from Indonesia, they do not require hibernation [1][2].

What temperature is ideal for Polyrhachis decipiens?

Keep them at 24-28°C, inferred from tropical habitat [3].

Are Polyrhachis decipiens good for beginners?

They are rated as medium difficulty. Stable tropical conditions may require more equipment, so some antkeeping experience is helpful [3].

How big do Polyrhachis decipiens colonies get?

Maximum colony size is unknown, but inferred up to several hundred workers from genus patterns [3].

When should I move my Polyrhachis decipiens colony to a formicarium?

Keep them in a test tube setup during founding. Move to a Y-tong or plaster nest once the colony reaches 20-30 workers [3].

Can I keep multiple Polyrhachis decipiens queens together?

This species is likely monogyne, so combining unrelated queens is not recommended [3].

What humidity level do Polyrhachis decipiens need?

Maintain moderate to high humidity, keep the nest substrate consistently moist but not waterlogged [3].

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References

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This caresheet is licensed under CC BY-SA 4.0 .