Solenopsis loretana

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Native to the Neotropical region: Argentina (Misiones), Brazil, and Paraguay. They nest in soil in humid subtropical tall forests, at the edges of campo cerrado and low forest, in mixed citrus groves, and in scrub forests, often at elevations around 240m ^[1][2].
• Colony Type: Colony structure is not directly documented. Based on typical Solenopsis patterns, colonies are likely monogyne (single queen). Only the worker caste has been described, the queen caste remains unknown ^[1].
• Size & Growth:
  • Queen: Undescribed, queen measurements are not available in scientific literature ^[1].
  • Worker: 1.74-2.04mm ^[1].
  • Colony: Unknown, colony size has not been documented in research.
  • Growth: Unknown, no development timing data exists for this species. Based on related small Solenopsis species, growth is likely moderate.
  • Development: Unconfirmed, no direct development data exists. Based on similar small Myrmicinae in warm climates, estimate 5-8 weeks at optimal temperature. (Estimate based on genus-level patterns for small tropical Solenopsis species. More data needed.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This species is a Tropical Climate Specialist from subtropical South America, so it needs warm conditions ^[2]. Use a heating cable on one side of the nest to create a gradient.
  • Humidity: High humidity is needed, think humid forest floor. Keep the nest substrate consistently moist but not waterlogged. Their natural habitat in humid subtropical forests suggests 70-85% relative humidity.
  • Diapause: Likely no true hibernation. As a tropical/subtropical species from northern Argentina, Brazil, and Paraguay, they probably don't require cold diapause. A slight cool period during winter (18-22°C) may be beneficial but isn't mandatory.
  • Nesting: Underground nester, they naturally dig nests up to 25cm deep in soil ^[1]. In captivity, a Y-tong (AAC) nest or plaster nest with soil chambers works well. Provide moist substrate they can tunnel into. Test tube setups are fine for founding colonies.
• Behavior: These are tiny, cryptic ants that prefer to stay hidden. They are not aggressive and likely avoid confrontation with larger ants. Their small size (under 2mm) means escape prevention is critical, they can squeeze through very small gaps. They are probably nocturnal or crepuscular foragers, searching for small prey and honeydew. As a Myrmicinae, they have a stinger, but due to their tiny size, it's unlikely to be painful to humans.
• Common Issues: tiny size makes escape prevention critical, use fine mesh and tight-fitting lids., humidity control is challenging, too dry causes colony decline, too wet leads to mold., stable warmth is essential, temperatures below 18°C can be fatal., only the worker caste is known, finding a queen is very difficult and may require field collecting., prey must be very small (fruit flies, micro crickets), large prey cannot be processed.

Housing and Nest Setup

Solenopsis loretana needs moist, soil-based housing that mimics their natural underground nests. A Y-tong (AAC) nest with narrow chambers or a plaster/soil formicarium works well. Chambers should be scaled to their tiny 2mm size. For founding colonies, a test tube setup with a water reservoir works, but you'll need to provide soil or a digging insert once the colony grows. These ants nest 25cm deep in the wild, so providing depth for tunneling is helpful ^[1]. Keep the nest area humid and dark, away from direct sunlight and vibrations. Create a humidity gradient using a water reservoir or moist substrate so the ants can choose their preferred zone.

Feeding and Diet

As a thief ant, Solenopsis loretana likely has a generalist diet, but exact wild foods are unknown. Offer small protein sources like fruit flies, pinhead crickets (crushed), small mealworms, and other tiny arthropods. They probably accept sugar sources like honey water or sugar water. Feed small amounts every 2-3 days, removing uneaten prey after 24 hours. Because they are so small, prey items must be scaled down, large prey cannot be handled. Observe your colony's preferences and adjust accordingly. ^[1]

Temperature and Seasonal Care

Being a Tropical Climate Specialist, this ant needs warm conditions year-round ^[2]. Maintain temperatures between 24-28°C during the active season. Place a heating cable on one side of the nest to create a thermal gradient. During winter, you can reduce temperatures slightly to 18-22°C to simulate seasonal changes, but avoid true cold diapause, they are not adapted to freezing. Stable temperatures are more important than exact numbers. If the colony becomes sluggish, try warming them up.

Handling and Colony Maintenance

These tiny ants require excellent escape prevention. Use tight-fitting lids, fine mesh on ventilation, and consider barrier methods like fluon on nest edges. When cleaning or moving the colony, use low light and work gently, they stress easily and prefer to stay hidden. Only transfer colonies when necessary, ideally during active hours. Monitor for mold in humid setups and provide a dry area within the enclosure. Their small size also makes them vulnerable to drowning in water reservoirs, use cotton wicks or similar to prevent accidents. ^[1]

Growth Expectations

Since only the worker caste has been documented, finding a mated queen for sale is very difficult ^[1]. If you obtain a colony, expect slow initial growth typical of small claustral species. First workers (nanitics) will be very small. Colony size is unknown but likely remains modest, probably under a few hundred workers given their tiny worker size. Keep detailed records of your colony's growth to contribute to our understanding of this species. Patience is key.

Frequently Asked Questions

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References