Pheidole perpilosa

Pheidole perpilosa

Pheidole perpilosa is a distinctive ant species native to the mountains of central and southern Arizona, found at elevations between 1400-1850 meters. The species gets its name from Latin, 'perpilosa' means 'very hairy', and these ants live up to that description with long erect hairs covering their bodies. Majors are yellowish brown and chunky at about 1.34mm head width, while minors are smaller at 0.70mm head width with a medium brown body and yellowish-brown cheeks. This species belongs to the fallax group and forms large colonies of up to 1500 workers, including both minor and major castes.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Arizona mountains (Cochise, Gila, and Yavapai Counties) south of the Mogollon rim, at 1400-1850m elevation. Found in forests containing pine, oak, and juniper, often in valley areas. Nests under rocks or in open soil ^[1].
• Colony Type: Monogynous, colonies have a single queen. Large colonies can contain up to 1500 workers including both minor and major castes ^[1].
  • Colony: Monogyne
• Size & Growth:
  • Queen: Unknown, not described in available literature
  • Worker: Minor: 0.70mm HW ^[1], Major: 1.34mm HW ^[1]
  • Colony: Up to 1500 workers (minors and majors combined) ^[1]
  • Growth: Moderate, based on typical Pheidole development patterns
  • Development: 6-8 weeks, estimated based on typical Pheidole genus development at warm temperatures (Development time is estimated from related Pheidole species. Pheidole colonies typically grow moderately fast once established.)
• Antkeeping:
  • Temperature: Keep at 22-26°C. These are mountain ants from Arizona that prefer moderate temperatures, avoid overheating. A slight temperature gradient allows workers to self-regulate ^[1].
  • Humidity: Moderate humidity around 50-60%. Being from valley forests with access to ground moisture, they appreciate some damp substrate but not wet conditions. Provide a water tube and keep nest substrate lightly moist ^[1].
  • Diapause: Yes, Arizona mountain winters get cold. Provide a hibernation period at 10-15°C for 2-3 months during winter months. Reduce feeding and keep them in a cool location ^[1].
  • Nesting: In nature they nest under rocks or in open soil. In captivity, a Y-tong (AAC) nest or plaster nest with some soil substrate works well. They prefer darker nest chambers. Provide a connection to an outworld for foraging ^[1].
• Behavior: Pheidole perpilosa is nocturnal, they forage mostly at night ^[2]. They are mass recruiters, meaning they recruit many workers to good food sources. Workers are predaceous and will hunt small insects. They have majors (soldier ants) that help process larger prey. These ants are not aggressive toward keepers but will defend their nest. Escape prevention is important as minors are small and can squeeze through small gaps ^[2].
• Common Issues: nocturnal activity means you may not see much happening during the day, colonies can reach 1500 workers quickly, ensure you have expansion space ready, predaceous diet requires live prey, they won't survive on just sugar water, majors take time to develop, don't expect large soldiers early in colony growth, hibernation is required for long-term colony health, skipping it can weaken the colony

Housing and Nest Setup

Pheidole perpilosa does well in Y-tong (AAC) nests or plaster nests with some soil chambers. They prefer darker nest environments, so consider using an acrylic nest with tinted sides or covering part of the nest to create shade. Since they nest under rocks in the wild, adding a flat stone or piece of bark on top of the outworld substrate gives them a natural feel. Connect the nest to a foraging area (outworld) where you can offer food. Make sure all connections are secure, these small ants can escape through tiny gaps. ^[1]

Feeding and Diet

These ants are predaceous, meaning they hunt and eat other small insects. In captivity, offer small live prey like fruit flies, pinhead crickets, small mealworms, and other tiny arthropods. They are nocturnal foragers, so offer food in the evening or leave it available overnight. While they may accept sugar water or honey occasionally, protein from live prey is essential for colony growth. Remove uneaten prey after 24 hours to prevent mold. Feed every 2-3 days, adjusting based on colony size and appetite. ^[2][1]

Temperature and Seasonal Care

Keep your colony at 22-26°C, warm but not hot. These Arizona mountain ants are adapted to moderate temperatures and can suffer if overheated. A heating cable on one side of the nest creates a temperature gradient so workers can choose their preferred spot. During winter (roughly November through February), provide a hibernation period at 10-15°C. Reduce feeding during this time and keep the colony in a cool location like an unheated garage or basement. This rest period is important for colony health and longevity. ^[1]

Understanding Major and Minor Workers

Pheidole perpilosa has two worker castes: minors and majors. Minors are the smaller workers (0.70mm head width) that handle most tasks like foraging and caring for brood. Majors are larger (1.34mm head width) with impressive mandibles that help process larger prey items and defend the colony. The majors develop over time, early-stage colonies will be all minors until the colony grows large enough to produce soldiers. Don't worry if you don't see majors initially, they appear once the colony reaches several hundred workers. Having both castes is one of the things that makes Pheidole species interesting to watch. ^[1]

Colony Growth Expectations

This species can grow to impressive colony sizes of up to 1500 workers. However, this takes time, expect moderate growth over several years. A newly founded colony might take 6-12 months to reach 100 workers, then growth accelerates. The presence of majors indicates a mature, healthy colony. Be patient with founding colonies, Pheidole queens seal themselves in to raise the first brood, and it can be weeks before you see the first workers (nanitics). Once established, growth is steady but not extremely fast. ^[1]

Frequently Asked Questions

References