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

Pheidole rugosa

Monogynous Non-Parasitic Queen No Gamergate
Sci. Name
Pheidole rugosa
Tribe
Attini
Subfamily
Myrmicinae
Author
Smith, 1858
Distribution
Found in 0 countries
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Introduction

Pheidole rugosa is a small ant species native to Sri Lanka . It was first described by Frederick Smith in 1858 . Like other Pheidole species, it has two worker castes: major workers with enlarged heads for seed-crushing, and minor workers that handle foraging . The species name 'rugosa' means wrinkled, referring to its body texture . The most interesting feature is the major worker's specialized head for processing hard foods, making them unique among ants .

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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: Easy
  • Origin & Habitat: Sri Lanka (Ceylon), tropical island environment [1][2]
  • Colony Type: Unconfirmed, based on typical Pheidole patterns, likely monogyne [2]
  • Size & Growth:
    • Queen: Size data unavailable, no total length measurements in research. Inferred from Pheidole genus as ~8-12 mm [2]
    • Worker: Size data unavailable, inferred from Pheidole genus: majors ~4-6 mm, minors ~2-3 mm [2]
    • Colony: Up to several hundred workers, estimated based on genus patterns [2]
    • Growth: Moderate, inferred from tropical Pheidole patterns
    • Development: Estimated 5-8 weeks at warm temperatures [2] (Development is faster in warm conditions, typical for tropical ants)
  • Antkeeping:
    • Temperature: Keep at 25-30°C, inferred from tropical species [2]
    • Humidity: High humidity preferred, keep substrate moist but not waterlogged [2]
    • Diapause: No, tropical species do not require hibernation [2]
    • Nesting: Y-tong or plaster nests work well, provide humid conditions [2]
  • Behavior: Generally peaceful and not aggressive. Escape risk is moderate, use standard barriers [2]
  • Common Issues: mold growth if humidity is too high and ventilation poor, colony slowdown if temperatures drop below 22°C, flooding risk in test tube setups if not monitored

Housing and Nest Setup

For founding colonies, a test tube setup works perfectly, fill it about one-third with water trapped behind a cotton plug, giving the queen a humid chamber to raise her first brood [2]. Once the colony reaches workers, move them to a formicarium. Y-tong or plaster nests are excellent because they hold humidity well [2]. Maintain consistent moisture without flooding [2].

Feeding and Diet

Pheidole rugosa is omnivorous. Offer protein sources like mealworms or crickets, and seeds for majors to process [2]. Provide sugar water or honey for carbohydrates [2]. Feed protein two to three times per week and keep sugar available [2]. Remove uneaten food after 24 hours to prevent mold [2].

Temperature and Humidity

Keep the nest area at 25-30°C for optimal brood development [2]. Use a heating cable for a temperature gradient [2]. Maintain high humidity around 60-80% by misting the outworld and keeping nest substrate moist [2]. No hibernation is needed for this tropical species [2].

Colony Development

A claustral founding queen seals herself in and raises first brood on stored fat reserves [2]. First workers appear in 5-8 weeks under warm conditions [2]. Colonies grow moderately to several hundred workers over time [2].

Behavior and Temperament

Pheidole rugosa is peaceful and not aggressive [2]. Major workers have enlarged heads for processing hard foods, while minors handle foraging [2]. They are active foragers but escape risk is moderate [2].

Frequently Asked Questions

How long does it take for Pheidole rugosa to have first workers?

Expect first workers in about 5-8 weeks at warm temperatures (25-30°C) [2].

What do I feed Pheidole rugosa?

Offer a varied diet: protein (insects), seeds, and sugar sources (honey water) [2].

Can I keep multiple Pheidole rugosa queens together?

Pheidole species are typically single-queen colonies, and combining queens is not recommended [2].

Do Pheidole rugosa need hibernation?

No, as a tropical species from Sri Lanka, they do not require hibernation [2].

How big do Pheidole rugosa colonies get?

Colonies likely reach up to several hundred workers, estimated from genus patterns [2].

What temperature is best for Pheidole rugosa?

Keep them at 25-30°C, with a temperature gradient for choice [2].

Are Pheidole rugosa good for beginners?

Yes, they are considered easy to keep, with moderate growth and non-aggressive behavior [2].

When should I move Pheidole rugosa to a formicarium?

Move them once the test tube colony has workers, ensuring the formicarium is set up with moist substrate [2].

Do Pheidole rugosa need escape prevention?

Standard barriers like fluon are sufficient due to moderate escape risk [2].

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References

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This caresheet is licensed under CC BY-SA 4.0 .