Myrmica boltoni

Quick Summary

• Difficulty: Hard
• Origin & Habitat: High altitude Himalayas in Nepal, specifically oak-rhododendron forests at 2000-3400m elevation ^[1][2]. This is a cold-adapted mountain species from one of the highest ant zones in the Himalayas.
• Colony Type: Unknown, only workers have been collected and described. The colony structure has not been documented in scientific literature.
• Size & Growth:
  • Queen: size data unavailable, queens have never been described in scientific literature
  • Worker: size data unavailable, no specific measurements exist for this species
  • Colony: Unknown, no large colony samples have been studied
  • Growth: Unknown
  • Development: Unknown, no development data exists for this species (No direct data exists. High-altitude Myrmica species typically develop slowly in cool conditions.)
• Antkeeping:
  • Temperature: Keep cool, aim for 15-22°C. This is a high-altitude cold-adapted species that naturally experiences cool mountain temperatures. Avoid warm conditions above 25°C.
  • Humidity: Moderate to high, provide damp nest conditions. These ants come from damp Quercus-Rhododendron forests. Keep nest substrate consistently moist but not waterlogged.
  • Diapause: Yes, this species originates from high altitudes in the Himalayas where winters are severe. Provide 3-4 months of cold hibernation around 5-10°C during winter.
  • Nesting: In the wild, workers have been found under rotten wood, in captivity, a Y-tong (AAC) nest or plaster nest with moisture retention works well. Provide narrow chambers scaled to their small size.
• Behavior: Not well documented due to limited scientific study. Based on genus patterns, they are likely moderately aggressive when disturbed and will defend their nest. Workers are small but active foragers.
• Common Issues: only workers are known scientifically, no queens have ever been described, no captive breeding records exist for this species, high altitude origin means they are sensitive to overheating, keep them cool, limited distribution in the wild makes captive adaptation uncertain, queen is unknown so wild colony founding is impossible, finding a queen may be impossible

Natural History and Distribution

Myrmica boltoni is one of the rarest Myrmica species known, found only in the high Himalayas of Nepal. It was first described in 1998 by Radchenko and Elmes from specimens collected at extraordinary altitudes between 2000 and 3400 meters ^[1]. This makes it one of the highest-dwelling ant species in the region. Workers have been found nesting under rotten wood in Quercus-Rhododendron forests, indicating a preference for damp, shaded mountain environments with decaying wood ^[1]. The species is endemic to Nepal, it has not been found anywhere else in the world ^[2]. Most collections come from the Mustang, Gorkha, and Baglung districts in central Nepal, with the highest records from the Marsyangdi area at 3300-3400m elevation ^[2].

Temperature Requirements

This is a cold-adapted mountain species that requires cool conditions. In captivity, maintain temperatures between 15-22°C, avoid anything above 25°C. The high altitudes where they naturally live experience cool temperatures year-round, with the warmest months rarely exceeding what temperate regions consider room temperature. During summer, you may need to keep them in a cool room or use minimal heating. A heating cable on one side of the nest can create a temperature gradient, allowing workers to choose their preferred zone. Never place them in direct sunlight or warm windowsills. ^[1][2]

Nesting and Humidity

In the wild, workers have been found under rotten wood in damp forests, so provide similar conditions in captivity. A Y-tong (AAC) nest or plaster nest works well, both retain moisture while providing dark, secure chambers. Keep the nest substrate consistently moist but not waterlogged. The substrate should feel damp to the touch. Myrmica boltoni likely tolerates a range of humidity levels but will do best with consistently damp conditions that mimic their damp forest floor habitat. Provide a water tube for drinking water and ensure the outworld is not too dry. ^[1]

Feeding and Diet

Like other Myrmica species, these ants are omnivorous with a preference for protein. Offer small insects like fruit flies, small mealworms, or crickets as primary protein sources. They will accept sugar water or honey as an energy source. Myrmica ants typically forage actively and will send workers to collect food. Feed small prey items 2-3 times per week, adjusting based on colony size. Remove uneaten prey after 24-48 hours to prevent mold. Sugar water can be provided continuously.

Diapause and Winter Care

Given their high-altitude Himalayan origin, these ants require a winter hibernation period. In captivity, provide 3-4 months of cold conditions around 5-10°C. This can be achieved by moving the colony to a cold garage, basement, or refrigerator. Reduce feeding to almost nothing during this period, the colony will be mostly inactive. Do not let them freeze, but provide genuine cold. This hibernation period is essential for their health and likely triggers reproductive cycles in spring. Resume normal feeding and warming gradually when temperatures rise in spring. ^[1][2]

Challenges in Captive Care

Myrmica boltoni presents significant challenges for antkeepers. First, only the worker caste is known scientifically, no queens have ever been described or collected. This means you cannot obtain a founding queen to start a colony ^[1]. Second, their high-altitude cold-adapted nature makes them sensitive to overheating. Third, there are essentially no captive breeding records for this species, meaning we know very little about their actual care requirements in captivity. They may prove difficult to keep alive long-term. For these reasons, this species is recommended only for experienced antkeepers who understand Myrmica care and can provide cool, stable conditions.

Frequently Asked Questions

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References