Pheidole desertorum

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the southwestern United States and northern Mexico, from western Oklahoma to California and south into Mexico ^[4][5][6]. Inhabits desert habitats including mesquite-acacia bajadas, rocky slopes, and grasslands, often nesting under stones or in crater nests ^[2].
• Colony Type: Typically monogyne (single queen) based on research ^[7], but multiple queens have been observed in some nests ^[2].
• Size & Growth:
  • Queen: size data unavailable
  • Worker: ~3.4 mm ^[1]
  • Colony: Up to 25,000 workers ^[2]
  • Growth: Moderate to fast
  • Development: Estimated 6-8 weeks based on genus patterns (Development time may vary with temperature, colonies reach maturity in 2-3 years under good conditions.)
• Antkeeping:
  • Temperature: Keep at room temperature (20-26°C) with a warm side around 28°C ^[2].
  • Humidity: Low to moderate, keep nest substrate relatively dry with a small water source to avoid mold ^[2].
  • Diapause: Unknown
  • Nesting: Test tubes work well for founding colonies. For established colonies, use Y-tong, plaster, or soil nests with dry to moderately moist substrate ^[2].
• Behavior: These ants are fast-moving, alert, and aggressive when disturbed. They are primarily nocturnal and become active after rainfall ^[2]. They evacuate nests to pre-established backup sites when threatened by army ants ^[8][9]. Escape risk is moderate due to their small size, use standard barrier methods.
• Common Issues: colonies may relocate frequently even under stable conditions, this is normal behavior ^[2]., overfeeding can cause mold in their dry nest, remove uneaten protein promptly., small minor workers can escape through standard barriers, check for gaps., sex-biased colony production is normal, some colonies produce only males or only gynes ^[11]., major workers are slower than minors, ensure prey is small enough for them to handle.

Housing and Nest Setup

For founding colonies, use a standard test tube setup with water and cotton plug, connected to an outworld. Once the colony has 20-30 workers, upgrade to a Y-tong or plaster nest. Keep the nest substrate dry, misting only occasionally, and provide a small water tube for drinking ^[2]. Avoid damp substrates to prevent mold, as these are desert-adapted ants ^[2].

Feeding and Diet

Feed protein-rich foods like small insects (fruit flies, pinhead crickets) twice weekly, removing uneaten prey within 24 hours to prevent mold. They also accept sugar water or honey occasionally ^[2]. This species is an aggressive predator and scavenger, not a seed-eater ^[2][3].

Temperature and Seasonal Care

Keep at room temperature (20-26°C) with a warm spot around 28°C using a heating cable if needed ^[2]. Diapause requirements are unknown, but a cool period in winter may be beneficial based on genus patterns.

Defense and Colony Behavior

When army ants attack, workers evacuate the colony to pre-established backup nests, holding brood and scattering to avoid raiders ^[8][9]. This behavior, called serial monodomy, involves maintaining multiple nest sites ^[10]. In captivity, colonies may relocate frequently, which is normal.

Colony Structure and Reproduction

Colonies have a dimorphic worker caste: minors (about 83%) and majors (soldiers, about 17%) ^[7]. Reproduction is sex-biased, with some colonies producing only males and others only gynes ^[11]. The population sex ratio is balanced at approximately 50% female ^[12][13].

Frequently Asked Questions

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References