Solenopsis dysderces

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Known only from the type locality: Aconcagua, Chile ^[1][2]. Found in a small chamber about 15cm below the soil surface, within a colony of Araucomyrmex, suggesting a subterranean and cleptobiotic lifestyle ^[1].
• Colony Type: Unknown, only workers have been collected. Based on related Solenopsis species, likely forms small colonies with a single queen.
• Size & Growth:
  • Queen: Unknown, queen never described ^[1]
  • Worker: 1.26-1.32mm total length ^[1]
  • Colony: Unknown, likely under 100 workers based on related pygmaea complex species ^[1]
  • Growth: Unknown
  • Development: Unknown, estimated 4-8 weeks based on related small Solenopsis species (No direct data exists. Related Solenopsis species in the pygmaea complex have not been studied in captivity.)
• Antkeeping:
  • Temperature: No confirmed data. Likely 20-26°C based on Chilean climate and related species. Maintain stable moisture and avoid overheating.
  • Humidity: High humidity required. Substrate should be kept moist but not waterlogged, consistent with subterranean habitat.
  • Diapause: Likely a mild winter slowdown given Mediterranean climate, but not confirmed. If attempting to keep, consider reducing temperature to 15-18°C for 2-3 months during Southern Hemisphere winter.
  • Nesting: Requires at least 15cm depth of moist soil in complete darkness, mimicking underground chambers. Test tubes are unsuitable due to light exposure. Use a soil-filled or plaster formicarium in a dark enclosure.
• Behavior: Extremely reclusive and nearly blind. Workers are pale yellow and avoid light. Not aggressive, too small to sting humans. Escape risk is high due to minute size, use very fine mesh. Likely cleptobiotic, reliant on host colonies.
• Common Issues: tiny size makes escape prevention extremely difficult, standard mesh may not contain them., no documented captive breeding success, this species may not survive in typical setups., cleptobiotic lifestyle means they may refuse conventional ant food., nearly blind and light-sensitive, excessive observation may stress them., no information on queen reproduction or colony founding, establishing a colony may be impossible.

Why This Species Is So Challenging

Solenopsis dysderces is one of the most difficult ants to keep in captivity, if it is even possible. This species has never been maintained in captivity, and almost no biological information exists beyond the original description ^[1]. Its subterranean lifestyle, nearly blind eyes, tiny size, and likely dependence on other ant colonies make it an extreme challenge. The few known specimens were collected by accident while excavating a different ant ^[1]. This is not a species you can simply acquire and house like a typical ant, it may require a host colony and specialized equipment to survive.

Housing and Nesting

Standard ant-keeping equipment will not work for this species. They need complete darkness and at least 15cm of moist soil based on their natural depth ^[1]. A naturalistic setup with deep moist soil in a dark enclosure is essential. Test tubes, Y-tong, and acrylic nests are completely unsuitable. You would need to create a custom underground chamber system that mimics their natural subterranean environment. Even then, success is uncertain, no one has documented keeping this species alive in captivity ^[1].

Feeding and Diet

This is the biggest challenge. As a likely cleptobiotic species, Solenopsis dysderces probably steals food from host ant colonies instead of foraging itself ^[1]. They may refuse conventional ant food entirely. In the wild they were found living alongside Araucomyrmex, and their diet likely consists of food fragments stolen from hosts or trophic eggs. If you somehow obtain a colony, you might need to maintain a host colony for them to steal from, a level of complexity that makes this species essentially impossible for typical ant keepers.

Temperature and Seasonal Care

Temperature needs are unclear. Based on the depth of their natural nest (15cm), the environment is stable and cool. Provide a consistent temperature around 20-25°C. Humidity is more important than temperature, keep the substrate moist. Diapause is not confirmed, if attempting to keep them, a mild winter slowdown may be beneficial but there is no data to guide this ^[1].

Is This Species Suitable for Keeping?

Almost certainly not. This species has never been kept in captivity and the biological requirements are essentially unknown. The combination of subterranean lifestyle, probable cleptobiotic dependence on other ants, tiny size, and light sensitivity make it perhaps the least suitable ant species for captive keeping. No established protocols, no documented successes, and no source for obtaining a colony exist. For ant keepers, this species is fascinating to read about but should remain in the realm of scientific curiosity. If you want to keep Solenopsis, consider species with established care protocols, such as Solenopsis fugax. ^[1]

Frequently Asked Questions

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References