Pheidole trachyderma

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Only recorded from San Pedro, Misiones province, Argentina, in the Neotropical region ^[1][2]. The functional group is Generalized Myrmicinae ^[1].
• Colony Type: Unconfirmed, based on Pheidole patterns, likely monogyne (single-queen colonies), but no specific data exists.
• Size & Growth:
  • Queen: Size data unavailable, inferred from Pheidole genus patterns
  • Worker: Size data unavailable, inferred from Pheidole genus patterns
  • Colony: Unknown, no data on colony size for this species
  • Growth: Unknown, estimated moderate based on genus patterns
  • Development: Unknown, no species-specific data. Based on Pheidole genus, estimated 6-10 weeks at warm temperatures (This is an estimate based on genus-level data since species-specific development has not been studied)
• Antkeeping:
  • Temperature: Based on habitat in Misiones province, keep warm around 22-26°C. Provide a temperature gradient
  • Humidity: Keep nest substrate moderately moist but not waterlogged, as Misiones has a humid climate
  • Diapause: Unknown, subtropical species may not require diapause
  • Nesting: Natural nesting behavior unconfirmed. Use standard Myrmicinae setups like test tubes or Y-tong nests
• Behavior: Pheidole species are generally non-aggressive. Major workers may defend the colony, but the sting is not medically significant. Escape risk is low due to small size.
• Common Issues: lack of species-specific care data makes keeping challenging., wild colonies are hard to find due to limited distribution., sensitivity to temperature drops due to subtropical origin.

Species Background

Pheidole trachyderma is one of the least studied ant species in the hobby, with virtually no published biological research. It was originally described by Carlo Emery in 1906 as a subspecies of Pheidole risii, then elevated to full species status by E.O. Wilson in 2003 based on morphological differences ^[2]. The species is known only from a handful of specimens collected in San Pedro, Misiones, Argentina, a region in the far northeast of the country bordering Brazil and Paraguay ^[2].

Identification and Morphology

This species shows the classic Pheidole dimorphism with distinct major and minor workers. Major workers have a distinctive rugoreticulate pattern on most of the dorsal head surface, while the minor workers are entirely foveolate and opaque ^[2]. Both castes are reddish-yellow in color, with majors being slightly darker ^[2].

Housing and Nesting

Since natural nesting behavior is undocumented, use standard Myrmicinae husbandry. Test tubes work well for founding colonies, provide a water reservoir and keep the cotton moist. Once the colony reaches a reasonable size, you can transition to a Y-tong or plaster nest. These ants are small, so ensure chambers are appropriately scaled. Provide a foraging area with access to protein foods and sugar water.

Feeding

Pheidole species are generalist omnivores. In captivity, offer protein sources such as small insects (fruit flies, pinhead crickets, mealworms), and provide sugar water or honey as an energy source. Many Pheidole also collect seeds, so you might offer tiny seeds as enrichment. Feed small amounts 2-3 times per week and remove uneaten food to prevent mold.

Temperature and Seasonal Care

This species originates from subtropical northern Argentina where temperatures are warm year-round. Aim for temperatures in the low-to-mid 20s Celsius (around 22-26°C). A heating cable on one side of the nest can create a temperature gradient, allowing ants to self-regulate. During cooler months, you may see reduced activity but true hibernation is unlikely.

Frequently Asked Questions

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References