Pheidole williamsi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to the Galápagos Islands (Ecuador), found in littoral, dry, and transition zones, nesting on sandy beaches, under rocks, in dry trunks, and foraging in leaf litter ^[1].
• Colony Type: Unconfirmed, no specific data on queen number or social structure for this species.
• Size & Growth:
  • Queen: Size data unavailable, no total length measurements for this species ^[2].
  • Worker: Size data unavailable, minor and major workers exist, but no total length measurements ^[2].
  • Colony: Unknown, typical Pheidole colonies can reach several hundred workers, but no specific data for this species.
  • Growth: Moderate, inferred from related Pheidole species.
  • Development: 6-8 weeks at optimal temperature, inferred from genus patterns. (Development time depends on temperature, warmer conditions speed up growth.)
• Antkeeping:
  • Temperature: Keep warm, around low-to-mid 20s°C, based on Galápagos climate ^[1].
  • Humidity: Provide a humidity gradient, mostly dry nest with one small moist area, as they nest in dry areas but also littoral zones ^[1].
  • Diapause: No diapause required, Galápagos have mild year-round temperatures ^[1].
  • Nesting: Use a test tube setup for founding colonies. For established colonies, Y-tong or plaster nests work well. They nest in sandy soil under rocks and in dry wood ^[1].
• Behavior: Pheidole williamsi is a ground-nesting ant that forages in leaf litter and around vegetation. They are not aggressive but will defend the nest. Escape prevention is important due to their small size ^[2].
• Common Issues: wild-caught colonies may carry the parasitic fungus Myrmicinosporidium durum, which can kill the colony ^[1][3], invasive Wasmannia auropunctata negatively affects this species in the wild, keep away from other ant colonies ^[4], rare in the wild so captive colonies are uncommon, limited availability, small colony size means slow growth, patience is required

Housing and Nest Setup

For founding colonies, use a standard test tube setup with a water reservoir. Once the colony reaches 20-30 workers, move them to a formicarium like a Y-tong or plaster nest. These allow you to maintain appropriate humidity while giving workers space to forage. In the wild, they nest in sandy soil under rocks and in dry wood, so provide a substrate they can dig in ^[1].

Feeding and Diet

Pheidole williamsi is likely a generalist like other Pheidole species. Offer protein sources such as small insects, and provide sugar water or honey as an energy source. In the wild, they forage in leaf litter, suggesting they scavenge ^[1]. Feed protein 2-3 times per week and keep sugar water available at all times.

Temperature and Seasonal Care

Keep your colony warm, around low-to-mid 20s°C, based on Galápagos climate. No true hibernation is needed, but activity may slow during cooler months. Use a heating cable if room temperature is below 20°C. Avoid extremes above 30°C or below 18°C ^[1].

Health and Common Problems

The biggest concern is the parasitic fungus Myrmicinosporidium durum, documented in wild populations ^[1][3]. Avoid wild-caught colonies if possible, and quarantine any new ants. Invasive Wasmannia auropunctata affects this species in the wild, so keep your colony isolated ^[4]. Standard hygiene practices help prevent issues.

Behavior and Observation

This species has major and minor workers, with majors having enlarged heads for defense. Workers forage individually or in small groups through leaf litter. They are not aggressive but will bite if the nest is disturbed. Watch for normal colony organization, like majors moving brood ^[2].

Frequently Asked Questions

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References