Pheidole clydei

Pheidole clydei - "Clyde's Big-headed Ant"

Pheidole clydei is a small Myrmicinae ant native to the American Southwest and northern Mexico. Workers come in two sizes: majors (soldiers) at about 1.2mm head width with reddish-yellow coloring, and smaller minors at 0.5mm head width with light brown bodies. This species is famous for its unusual nesting habit, it lives exclusively in rock crevices rather than soil, nesting in cracks between boulders, on top of large boulders, and in narrow horizontal cracks in solid rock walls. The majors serve as aggressive nest guards while minors handle all foraging duties, making this species a fascinating example of caste specialization.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Desert canyons of the American Southwest, from New Mexico and Arizona through southern Nevada and California into northern Mexico. Found in riparian areas within desert communities from 150 to 2200 meters elevation.
• Colony Type: Likely monogyne (single queen) based on typical Pheidole patterns. No specific colony structure data found for this species.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Not documented in available sources, typical Pheidole queens likely 5-7mm
  • Worker: Majors: 1.2mm head width, Minors: 0.5mm head width
  • Colony: Unknown, typical Pheidole colonies reach hundreds to low thousands of workers
  • Growth: Moderate, inferred from related Pheidole species
  • Development: 6-10 weeks estimated based on typical Pheidole development at warm temperatures (Development time is estimated, actual timing may vary based on temperature and feeding)
• Antkeeping:
  • Temperature: Keep at 22-28°C. As a desert species from the American Southwest, they prefer warm conditions but can tolerate temperature fluctuations. A gradient allowing them to choose their preferred spot works well.
  • Humidity: Low to moderate, desert canyon species. Keep nest substrate dry to slightly moist, with a small water tube for humidity. Avoid overly damp conditions that could cause mold in their rock-crevice-style setup.
  • Diapause: Unknown, desert species may have reduced activity in winter but true hibernation requirements are unconfirmed. Many southwestern ants do fine at room temperature year-round.
  • Nesting: Rock-crevice specialist. They naturally nest in tight cracks between boulders and in narrow horizontal rock fissures. In captivity, they do well in Y-tong (AAC) nests with narrow chambers, or acrylic nests with tight passages. Avoid large open spaces, they prefer cramped, tight-fitting chambers similar to their natural rock crevices.
• Behavior: Majors are highly aggressive guards that defend the nest entrance savagely, attacking any intruder. Minors are docile scavengers that do all foraging, bringing back arthropod prey and remains. Unlike many Pheidole, they do NOT eat seeds, they are strictly carnivorous scavengers. Foraging occurs mainly between 9:00 AM and 1:00 PM in the wild. Escape risk is moderate, minors are small but majors are larger. Use standard escape prevention.
• Common Issues: colonies may fail if kept too damp, desert species prone to mold in overly humid conditions, majors can be aggressive and may bite if provoked, though their small size limits harm, slow growth compared to some tropical species may frustrate beginners expecting fast development, wild-caught colonies from rock crevices may be difficult to locate and collect, they refuse sugar, new keepers may waste time offering sweet foods this species won't accept

Nest Preferences and Housing

Pheidole clydei is unusual among ants because it exclusively nests in rock crevices rather than soil. In the wild, researchers have found colonies in crevices between boulders and thin rock laminae, on top of large boulders 4.5-9 meters across, and in narrow horizontal cracks in solid rock walls. This is a critical piece of information for keepers, they do not want soil nests. In captivity, Y-tong (AAC) nests work well because the narrow chambers mimic their natural rock crevices. Acrylic nests with tight passages are also suitable. Avoid large, open spaces in the nest, these ants prefer cramped quarters. The outworld can be standard, but ensure there are hiding spots since minors may be shy during foraging.

Feeding and Diet

This species is strictly carnivorous and will NOT eat seeds, despite many Pheidole being seed harvesters. In the wild, minors forage exclusively for arthropods, researchers have observed them bringing in dead spiders, flies, geometrid larvae, termite nymphs, and even dead majors of other Pheidole species. They are scavengers rather than active predators, minors are slow to attack other insects and often lose fights to termites even when outnumbering them. In captivity, offer small insects like fruit flies, small crickets, mealworms, and other arthropod prey. Protein-rich foods are essential. Sugar water or honey is typically rejected, focus on insect protein. Feed every 2-3 days, removing uneaten prey to prevent mold.

Caste Behavior and Colony Roles

One of the most fascinating aspects of Pheidole clydei is the clear division of labor between castes. The minor workers handle ALL foraging, they leave the nest to search for arthropod prey, following scent trails but not forming organized columns. The majors (soldiers) almost never leave the nest except to help dissect large prey items near the entrance. Their primary role is guarding the nest entrance, they stand in a cluster just inside and savagely attack anything that enters, locking their powerful mandibles onto intruders and holding on so tightly they can be pulled out of the nest still attached. This makes the nest nearly impregnable. Minors, by contrast, are not aggressive at all. When keeping this species, you'll see majors clustered at the nest entrance while minors actively move through the outworld.

Temperature and Seasonal Care

As a desert canyon species from the American Southwest, Pheidole clydei prefers warm conditions. Keep the nest at 22-28°C, with a slight gradient allowing the colony to choose their preferred temperature. They can tolerate higher temperatures briefly but avoid extremes. In the wild, they forage mainly between 9:00 AM and 1:00 PM when temperatures are moderate, and they stay in shade until about 8:30 AM. This suggests they avoid the hottest parts of the day. For captive care, room temperature in the low-mid 20s°C is a good starting point. Winter activity may decrease but true hibernation requirements are unknown, many southwestern ants do fine at room temperature year-round with slightly reduced activity.

Frequently Asked Questions