Myrmelachista arthuri

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Atlantic Forest of southeastern Brazil, Argentina, and Paraguay. This species nests in wood or stems of live and dead standing plants, primarily tree trunks and branches ^[1][2][3].
• Colony Type: Likely single-queen colonies (monogyne) based on genetic data showing a single mitochondrial haplotype across colonies, suggesting interconnected populations ^[3].
• Size & Growth:
  • Queen: Size data unavailable, no total length measurements in research context
  • Worker: Size data unavailable, no total length measurements in research context
  • Colony: Up to 1,000 workers in mature colonies ^[4]
  • Growth: Moderate
  • Development: Unknown, no direct development data available, estimated 6-8 weeks at optimal temperature based on related Formicinae patterns (Development time may vary with temperature and colony conditions)
• Antkeeping:
  • Temperature: Keep colonies at 24-28°C. Worker activity increases with higher temperatures, supporting natural foraging behavior ^[2][3].
  • Humidity: Maintain consistently moist substrate but avoid waterlogging. Lab colonies thrived at 70±10% humidity ^[2].
  • Diapause: No, as a tropical species, they do not require hibernation. Maintain consistent warm temperatures year-round.
  • Nesting: Arboreal nesting specialist. Provide vertical setups with access to wood, cork, or plant stems. Y-tong nests or wooden formicaria work well. Ensure climbing surfaces and multiple chambers ^[2][3].
• Behavior: Workers are aggressive and raise their gasters when disturbed as a defensive display ^[2][5]. They forage actively along tree stems, with activity peaking in the afternoon and during the cold/dry season ^[3]. Escape prevention is important due to their climbing agility. Intraspecific predation is normal behavior, with workers consuming injured or dead nestmates ^[3].
• Common Issues: workers dying outside the nest is normal, sick ants leave to protect the colony, colonies need vertical space and climbing surfaces to replicate arboreal lifestyle, foraging trails require adequate space to prevent stress and reduced activity, mold can develop if humidity is too high and ventilation is poor, small colony fragments may struggle without proper heat and humidity gradients

Nest Preferences and Housing

Myrmelachista arthuri is an obligate arboreal nester, colonizing standing live or dead tree stems but never fallen twigs in leaf litter ^[2][3]. In captivity, provide vertical-oriented housing such as Y-tong nests, wooden formicaria, or cork bark setups. Ensure multiple connected chambers and climbing structures, as colonies can occupy over 50 cm of trunk length in nature ^[2]. Escape prevention is critical due to their agility.

Feeding and Diet

This species is a generalist carnivore. In the wild,92% of their diet consists of arthropods or remains, with 47% being their own workers ^[3]. They also prey on springtails, insects, and small beetles ^[6]. In captivity, offer small insects like fruit flies or pinhead crickets, and sugar water. Intraspecific predation is normal and provides protein.

Temperature and Seasonal Care

Maintain temperatures between 24-28°C for optimal activity ^[2][3]. Worker foraging increases with temperature, so a heating gradient helps. Humidity should be kept moist but not waterlogged, as lab colonies thrived at 70±10% ^[2]. No diapause is needed for this tropical species.

Behavior and Colony Dynamics

Workers display aggression by raising their gasters when disturbed ^[2][5]. They establish clear foraging trails on tree stems, with activity peaking in the afternoon and during colder seasons ^[3]. Colonies can exceed 1,000 workers and may spread to nearby trees ^[4][3]. Expect active, visible workers constant on trails.

Reproduction and Nuptial Flights

Winged reproductives have been observed in laboratory colonies, with males appearing in August, September, and November ^[2]. Nuptial flights occurred in September over two years, with temperatures of 24-29°C ^[4]. Alate production may align with seasonal transitions in their native habitat.

Frequently Asked Questions

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References