Myrmica yezomonticola

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the mountains of Hokkaido, Japan. Found at higher elevations in open sites ^[1]. This is a northern temperate species adapted to cooler mountain conditions.
• Colony Type: Colony type is unconfirmed. Based on typical Myrmica patterns, likely single-queen colonies.
• Size & Growth:
  • Queen: ~6-8mm, estimated from Myrmica genus patterns
  • Worker: 4.6mm total length ^[1]
  • Colony: Likely up to several hundred workers based on related Myrmica species
  • Growth: Moderate
  • Development: 6-10 weeks estimated from related Myrmica species (Development time is estimated from genus-level data since species-specific timing is unconfirmed. Cooler mountain habitat may result in slightly longer development.)
• Antkeeping:
  • Temperature: Keep around 18-22°C. This is a mountain species from northern Japan, so it prefers cooler conditions than many tropical ants. A room-temperature setup around 20°C works well, avoid overheating.
  • Humidity: Moderate humidity. Keep the nest substrate slightly moist but allow some drying between water additions. Provide a humidity gradient so ants can choose their preferred zone.
  • Diapause: Yes, required. As a northern Japanese mountain species, this ant needs a winter hibernation period. Reduce temperature to around 5-10°C for 3-4 months during winter.
  • Nesting: Y-tong or plaster nests work well. Provide a moisture gradient so ants can choose their preferred humidity zone. The nest should have narrow chambers scaled to their small worker size.
• Behavior: Workers are active foragers that search for protein and sugar sources. They are not particularly aggressive but will defend the nest if threatened. Like most Myrmica, they can deliver a mild sting if handled roughly. Escape risk is moderate, their small size means they can squeeze through small gaps, so use tight-fitting lids and barrier gel.
• Common Issues: hibernation failure is common, this species needs a proper winter rest or colonies may decline over time, small worker size means escape prevention must be good, they can slip through standard test tube barriers, overheating is a risk, keep them cool, never above 25°C, wild-caught colonies may carry parasites that cause colony collapse, slow growth can lead to overfeeding, resist the urge to offer too much food

Housing and Nest Setup

Myrmica yezomonticola does well in Y-tong or plaster nests with built-in water channels. Because workers are only about 4.6mm, ensure chambers and passages are appropriately scaled, avoid large open spaces. Provide a humidity gradient by keeping one side moister than the other, allowing ants to self-regulate. A test tube setup works for founding colonies, but transfer to a proper nest once the colony reaches 20-30 workers. Always use escape prevention, these small ants can squeeze through tiny gaps. Apply fluon to test tube rims and use fine mesh on any ventilation holes.

Feeding and Diet

Like other Myrmica species, these ants are omnivorous and need both protein and sugar. Offer protein sources like fruit flies, small crickets, mealworms, or waxworms roughly twice weekly. For sugar, provide sugar water, honey, or diluted honey water in a cotton ball or feeder. Remove uneaten protein within 24 hours to prevent mold. This species should accept standard ant foods, there's no evidence of unusual dietary requirements. Always ensure fresh water is available.

Temperature and Seasonal Care

This is a cool-adapted species from Japanese mountains. Keep the nest at 18-22°C, room temperature around 20°C is ideal. Avoid any heating beyond this range, as overheating can kill colonies. During winter, you must provide a hibernation period. Reduce temperature to 5-10°C for 3-4 months from late autumn through winter. Do not skip hibernation, northern Myrmica species need this rest period to maintain healthy colonies long-term. Resume normal temperatures gradually in spring.

Colony Development

A claustral queen will seal herself in a small chamber and survive on stored fat reserves while raising her first brood. Expect the first nanitic workers to emerge in 6-10 weeks under optimal conditions, though this is estimated from related species. Initial colonies grow slowly, the first dozen workers take time to develop. Once established, growth becomes more steady. Colony size likely reaches several hundred workers at maturity. Be patient during the founding phase, disturbing the queen or moving the nest can cause colony failure.

Behavior and Defense

Workers are active foragers that readily search for food both in the nest and outworld. They are not particularly aggressive toward keepers but will defend against threats. Like all Myrmica, they can sting, though the sting is mild and rarely penetrates human skin. Workers may exhibit minor alarm responses but typically settle quickly. Their small size makes them good escape artists, always use barrier gel or fluon and check for gaps in your setup.

Frequently Asked Questions

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References