Pheidole magrettii

Pheidole magrettii

Pheidole magrettii is a small ant species native to Southeast Asia, found across Indonesia, Malaysia, Singapore, and Thailand ^[1]. Like all Pheidole species, they have two worker castes: major workers (soldiers) with enlarged heads for seed processing, and smaller minor workers that handle most tasks outside the nest. The species was first described by Carlo Emery in 1887 from Java ^[2]. Major workers measure 3.67-4mm while minor workers are around 2mm ^[2]. This species is closely related to Pheidole nodgii and Pheidole tjibodana, with subtle differences in head sculpture and propodeal spine length that distinguish them ^[1].

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Tropical Southeast Asia, found in Indonesia (Java), Malaysia, Singapore, and Thailand (Ranong: Klong Naka) ^[3][1]. Inhabits tropical forest environments in the Indomalaya region.
• Colony Type: Single-queen colonies (monogyne). Pheidole species typically establish single-queen nests.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 6-8mm based on genus patterns
  • Worker: Major workers 3.67-4mm, minor workers about 2mm ^[2]
  • Colony: Likely reaches several thousand workers based on typical Pheidole colony growth
  • Growth: Moderate, typical for tropical Pheidole
  • Development: Estimated 5-8 weeks at tropical temperatures (25-28°C) (Development time inferred from typical Pheidole genus patterns. Warm temperatures accelerate development.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. Tropical species requiring warm conditions. A heating cable on one side of the nest creates a gentle gradient.
  • Humidity: Moderate to high humidity (60-80%). Keep substrate consistently moist but not waterlogged. Mist occasionally and provide a water tube.
  • Diapause: No, being a tropical species, they do not require hibernation. Activity may slow slightly during cooler periods.
  • Nesting: Will adapt to various nest types. Y-tong (AAC) nests, plaster nests, or test tube setups work well. Provide moist substrate for brood chambers.
• Behavior: Generally peaceful and non-aggressive. Major workers use their enlarged heads to crack seeds and process food. They are active foragers that readily collect seeds and small insects. Minor workers are small and can escape through tiny gaps, excellent escape prevention is essential.
• Common Issues: escape prevention is critical, minor workers are tiny and can squeeze through standard barrier gaps, overheating can stress colonies, keep temperatures stable and below 30°C, mold can develop if substrate stays too wet, ensure proper ventilation, colonies may abandon chambers that become too dry, monitor moisture levels, wild-caught colonies may contain parasites, quarantine and observe new colonies

Housing and Nest Setup

Pheidole magrettii adapts well to various captive setups. Y-tong (AAC) nests work excellently because they provide dark, humid chambers that these ants prefer. Plaster nests with built-in water channels maintain consistent humidity. Test tube setups are suitable for founding colonies, use a second tube connected as a water reservoir. The key requirement is maintaining moisture in the brood area while providing a dry outworld for foraging. Connect the nest to an outworld (foraging area) that is at least 10cm from the nest to prevent mold from spreading. Use a barrier like fluon on the rim of the outworld to prevent escapes.

Feeding and Diet

Pheidole magrettii is a typical Pheidole, they are granivores that collect and process seeds, but they also readily accept protein sources. Offer a mix of seeds (millet, chia, flax, small bird seed) that the major workers will store and process in their enlarged heads. Protein should come from small insects like fruit flies, pinhead crickets, or mealworms. Sugar sources like honey water or sugar water are typically accepted. Feed seeds continuously and offer protein 2-3 times per week. Remove uneaten seeds to prevent mold. Remove uneaten protein within 24 hours.

Temperature and Humidity

As a tropical species from Southeast Asia, Pheidole magrettii requires warm conditions. Keep the nest area at 24-28°C. A heating cable placed on top of the nest (never underneath where it can dry out the substrate) creates a gentle thermal gradient. Room temperature may suffice if your home stays in this range. Humidity should be moderate to high, aim for 60-80% relative humidity in the nest. The substrate should feel damp to the touch but never waterlogged. A water tube connected to the nest helps maintain humidity. Avoid temperatures above 32°C or sudden temperature drops.

Colony Growth and Development

A newly mated queen will seal herself in a small chamber and lay eggs. She feeds the first brood from her stored fat reserves, this is called claustral founding and is typical for Pheidole. The first workers (nanitics) are smaller than normal majors and minors. After the first workers emerge, the colony enters a growth phase. Expect the colony to reach 50-100 workers within 6-12 months under good conditions. Pheidole colonies can grow to several thousand workers over several years. The ratio of majors to minors varies by colony size and environmental conditions, more majors appear as the colony matures.

Escape Prevention

This is critical for Pheidole magrettii. The minor workers are only about 2mm and can squeeze through incredibly small gaps. Standard barrier methods may not be sufficient. Apply fluon (insect barrier) to all rim edges and connection points. Check for gaps as small as 1mm. Use fine mesh (at least 0.5mm) on any ventilation holes. When connecting tubes, use snug-fitting adapters rather than loose connections. Inspect the setup daily during the first weeks. Even a small escape can result in a significant number of lost workers.

Frequently Asked Questions

References