Pheidole pinealis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Western Texas and central Mexico (Guanajuato, Coahuila, San Luis Potosí, Oaxaca) in arid to semi-arid habitats at elevations from 119 to 1200 meters, nesting under stones, in soil, or under cow dung ^[2][3][4][1].
• Colony Type: Based on Pheidole genus patterns, likely monogyne (single queen colonies), but unconfirmed in literature ^[1].
• Size & Growth:
  • Queen: Size data unavailable, inferred from Pheidole genus to be approximately 5-7 mm
  • Worker: Size data unavailable, inferred from Pheidole genus to be approximately 2-4 mm for minors and 3-5 mm for majors
  • Colony: Up to 57 workers (based on documented wild colonies) ^[1]
  • Growth: Moderate
  • Development: Unknown, no specific data available for this species (Development timing is unclear, typical Pheidole species take 6-8 weeks at warm temperatures, but this is not confirmed for P. pinealis)
• Antkeeping:
  • Temperature: Keep at warm room temperature, roughly 22-26°C, based on their southwestern range ^[1]. A heat gradient may be beneficial but is not required.
  • Humidity: Keep nest substrate moderately dry, as they are adapted to arid regions, allow areas to dry between waterings ^[1].
  • Diapause: Likely yes, inferred from temperate latitudes, provide 2-3 months of cooler temperatures (10-15°C) during winter ^[1].
  • Nesting: Use test tube setups for founding colonies, for established colonies, small formicaria or Y-tong nests with soil substrate mimic their natural nesting under stones ^[1].
• Behavior: Generally peaceful and non-aggressive, workers forage for seeds and small prey. Escape risk is low due to small size, but standard prevention is recommended. Majors assist with seed processing and defense but are not highly aggressive ^[1].
• Common Issues: small colony size means slow growth, expect steady but limited expansion, seed-harvesting behavior may lead to ignoring protein foods initially, winter diapause is likely required but timing is not well documented, limited distribution in the hobby makes founding colonies hard to obtain, arid adaptation means sensitivity to overwatering, keep conditions dry

Housing and Nest Setup

Start colonies in test tube setups with a water reservoir, queens will seal themselves in to raise first brood ^[1]. Once workers emerge, move to small formicaria or Y-tong nests with tight chambers, as they prefer dry, soil-based substrates mimicking their wild nesting under stones ^[1]. Avoid large setups due to small colony size.

Feeding and Diet

As seed-harvesters, offer a constant supply of small seeds like grass seeds or millet ^[1]. Protein sources such as fruit flies or small insects can be offered 1-2 times per week. The type colony had seed caches, confirming this behavior ^[1].

Temperature and Seasonal Care

Maintain temperatures around 22-26°C, a heat gradient is optional. During winter, provide diapause at 10-15°C for 2-3 months, reducing feeding and keeping the nest drier ^[1].

Colony Development and Growth

Colonies remain small, with documented wild populations up to 57 workers ^[1]. Growth is moderate, expect slow expansion rather than rapid increase. Major workers appear as colonies develop, aiding in seed processing and defense.

Behavior and Foraging

Workers are active foragers for seeds and small prey, with minimal aggression. They nest in open soil or under stones at various elevations, from 119 to 1200 meters ^[3][1]. In captivity, they establish foraging trails once settled.

Frequently Asked Questions

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References