Myrmica fracticornis

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to northern North America, Newfoundland to Alaska, south to Tennessee, Michigan, Ohio, and western states ^[1][2]. Found in woodlands, bogs, dry fields, and urban green spaces ^[2][3][5]. Nests in soil under rocks, grass-covered mounds, or hummocks in marshy areas ^[2][9].
• Colony Type: Facultatively polygyne, colonies can have single or multiple queens (1-15 documented) ^[2]. Workers forage on ground and foliage, collecting honeydew from aphids ^[2][10].
• Size & Growth:
  • Queen: Size data unavailable, inferred from Myrmica genus to be larger than workers
  • Worker: 3.9-5.2 mm ^[2]
  • Colony: Up to 627 workers ^[2]
  • Growth: Moderate
  • Development: 6-10 weeks at optimal temperatures, inferred from Myrmica genus patterns (Development time may vary based on temperature and conditions)
• Antkeeping:
  • Temperature: Keep at room temperature, roughly 20-24°C, with a gradient to allow workers to choose preferred spots ^[2].
  • Humidity: Provide a humidity gradient, mostly dry nest chamber with one small moist area, reflecting their tolerance for drier habitats ^[6][2].
  • Diapause: Yes, reduce temperature to 5-10°C for 3-4 months during winter to mimic natural seasonal cycle ^[11][2].
  • Nesting: Use test tubes, Y-tong, plaster, or soil nests. Provide a nest chamber with access to water for humidity control, based on natural nesting in soil and hummocks ^[2][9].
• Behavior: Workers are slow-moving and non-aggressive, foraging on ground and foliage for honeydew ^[2][10]. They are not strong escape artists but use standard precautions. The species is a habitat generalist, found in natural and disturbed areas ^[5][12].
• Common Issues: colonies may fail if kept too wet, provide a humidity gradient to avoid drowning, winter die-off is common if diapause is not provided, wild-caught colonies may have parasites that kill them in captivity, slow growth can frustrate beginners, colonies may take months to establish, multiple queens may fight if introduced improperly, start with single queen or allow natural structure

Housing and Nest Setup

Myrmica fracticornis adapts well to various nest types. Use test tubes for founding colonies, fill with water, plug with cotton, and cover with darkness. For established colonies, Y-tong, plaster, or soil nests work well. Provide a humid chamber with water access, but avoid constant saturation since they tolerate drier conditions ^[6][2]. A substrate chamber lets them create tunnels, and a small outworld completes the setup.

Feeding and Diet

In the wild, they feed on honeydew from aphids ^[2][10]. In captivity, offer constant sugar water or honey, and protein like fruit flies or small crickets 2-3 times per week. Remove uneaten prey after 24-48 hours to prevent mold. Workers forage slowly, so place food near trails.

Temperature and Seasonal Care

Keep colonies at 20-24°C for optimal activity. This species tolerates cooler temperatures due to its northern range ^[2]. In winter, provide diapause at 5-10°C for 3-4 months to mimic natural cycles ^[11]. Gradual temperature changes are important to avoid stress.

Colony Dynamics and Multi-Queen Behavior

Colonies can have one or multiple queens (1-15 documented) ^[2]. Multiple queens often coexist peacefully. If starting with multiple foundresses, provide space and avoid disturbance until workers emerge. Single-queen colonies are stable for beginners.

Behavior and Handling

Workers are docile and slow-moving, not aggressive ^[2]. They can sting but rarely penetrate human skin. Escape prevention is straightforward with standard barriers. They are habitat generalists, forgiving of minor care mistakes ^[5][12].

Frequently Asked Questions

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References