Solenopsis metanotalis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to southern South America (Argentina, Uruguay, Bolivia, Brazil) and also recorded in Venezuela. Found in wet soils in creosote bush desert shrubland and in rain forest leaf litter, at elevations from 600 m to 1796 m ^[1][2][3].
• Colony Type: Unknown. Most Solenopsis species are monogyne (single queen colonies), but this is unconfirmed for S. metanotalis.
• Size & Growth:
  • Queen: ~4.4 mm ^[1]
  • Worker: ~2.1-2.3 mm ^[1]
  • Colony: Unknown, likely up to several hundred workers (based on related species).
  • Growth: Unknown, likely moderate.
  • Development: 6-10 weeks (estimated from related Solenopsis species, no data for S. metanotalis). (Estimated at warm temperatures (around 26°C).)
• Antkeeping:
  • Temperature: Likely prefers 24-28°C. S. metanotalis is classified as a Tropical Climate Specialist ^[3]. Provide a thermal gradient (heating cable on one side). Avoid prolonged temperatures below 18°C.
  • Humidity: Moderate to high. Naturally collected from wet soils after rain and from forest litter. Keep nest substrate consistently moist but not waterlogged, allow some surface drying between waterings ^[1].
  • Diapause: Not required. Native subtropical climate means no true hibernation, though activity may slow if room temperature drops naturally.
  • Nesting: Small chambers in Y-tong, plaster, or soil nests work best. Use a test tube for founding. Avoid large open spaces, these ants prefer tight chambers scaled to their small size.
• Behavior: Small (2 mm workers) and fast-moving. They have a functional stinger (typical of Solenopsidini) but the sting is mild and rarely felt by humans. Escape prevention is critical, seal all gaps with fluon and use fine mesh. Not aggressive toward humans, but will defend the nest.
• Common Issues: escape risk due to tiny size, seal all gaps with fluon and use fine mesh on ventilation., unknown founding behavior, queen rearing is unpredictable, no data on whether queens found claustrally., requires consistent warmth, avoid temperatures below 18°C for long periods., slow to moderate colony growth, patience needed.

Housing and Nest Setup

Start a new colony in a small test tube with a water reservoir sealed by tightly packed cotton, workers are only 2 mm, so the cotton must be very dense to prevent escapes. Once the colony has around 20-30 workers, move them to a small Y-tong, plaster, or soil nest with chambers no larger than a few centimeters. Avoid acrylic nests. Keep the outworld small (5-10 cm) for the first year. Apply fluon to all rims and use fine mesh (≤0.5 mm) on ventilation holes, because these ants can squeeze through gaps that look impossibly small ^[1].

Feeding and Diet

Like many Solenopsis, S. metanotalis is likely predatory. Offer tiny protein sources: fruit flies, pinhead crickets, small mealworms, and other small insects. They will also scavenge on dead insects. You can provide sugar water or honey for energy, though they may prefer protein. Feed 2-3 times per week for a growing colony and remove uneaten food after 24 hours to prevent mold. Provide a constant water source (e.g., a test tube feeder). Prey items should be no larger than the ant’s head. No specific diet data is available for this species, these are general Solenopsis guidelines.

Temperature and Seasonal Care

These subtropical ants prefer warm conditions. Use a heating cable on one side of the nest to create a gradient from ~24°C to 28°C. They are classified as Tropical Climate Specialists ^[3]. Keep the nest above 18°C at all times. They do not need a true winter diapause, but if your room temperature drops in winter, activity will slow naturally. Maintain humidity by keeping the nest substrate moist, these ants have been collected from wet soils after rain ^[1].

Behavior and Defense

S. metanotalis has a functional stinger (subfamily Myrmicinae, tribe Solenopsidini), but the sting is very mild due to the ant’s small size. They are not aggressive toward humans and will only sting if handled roughly. Their most important defensive behavior is escaping, their tiny size lets them slip through tiny cracks. Excellent escape prevention is critical: use fluon on container edges, fine mesh on vents, and check all seams. In the wild they are active foragers on the ground and in leaf litter. No specific colony behavior has been documented for this species.

Growth and Development

Colony growth is expected to be slow to moderate, based on related small Solenopsis species. The first workers (nanitics) are smaller than mature workers. At optimal temperatures (~26°C), egg-to-worker development is estimated at 6-10 weeks. The colony likely reaches several hundred workers at maturity, but this is unconfirmed. Founding behavior (whether queens found claustrally or semi-claustrally) is unknown. Be patient, small Solenopsis colonies grow steadily but not rapidly.

Frequently Asked Questions

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References