Myrmica orthostyla

Quick Summary

• Difficulty: Medium
• Origin & Habitat: High-altitude mountain steppes of Central Asia (Kyrgyzstan and Russian Federation) at approximately 2500 meters elevation. Nests are built in soil, typically under stones ^[1].
• Colony Type: Likely monogyne (single queen) colonies based on typical Myrmica genus patterns.
• Size & Growth:
  • Queen: Size data unavailable for this species, inferred from Myrmica genus (~5-7mm)
  • Worker: Size data unavailable for this species, inferred from Myrmica genus (~4-6mm)
  • Colony: Likely several hundred workers based on related Myrmica species
  • Growth: Moderate, typical for Myrmica genus
  • Development: Estimated 6-10 weeks at optimal temperature based on related Myrmica species (Development time typical for temperate Myrmica, cooler high-altitude conditions may slightly extend development)
• Antkeeping:
  • Temperature: Keep around 18-22°C. As a high-altitude species, they prefer cooler conditions than many lowland Myrmica. A temperature gradient allowing cooler areas is beneficial
  • Humidity: Moderate humidity, mountain steppe conditions. Keep nest substrate moist but not waterlogged, with some drier areas available. Good ventilation is important to prevent mold
  • Diapause: Yes, required for colony health. As a high-altitude temperate species, they need a winter hibernation period of 3-4 months at cool temperatures (5-10°C). This mimics their natural high-altitude seasonal cycle
  • Nesting: Y-tong (AAC) or plaster nests work well. They naturally nest in soil under stones, so provide a nest with soil chambers or substrate they can dig in. Flat stones or a naturalistic setup with stones on soil mimics their natural nesting preferences
• Behavior: Myrmica orthostyla is not particularly aggressive but will defend the nest if threatened. Workers are active foragers, typical of the genus, they search for honeydew and small insects. They have a functional stinger but it's small and rarely penetrates human skin. Escape risk is moderate, standard test tube setups and formicarium barriers work well for this size class. They are diurnal and actively forage during warmer hours.
• Common Issues: High-altitude origin means they do poorly in warm conditions, avoid temperatures above 25°C, Diapause is essential, colonies that don't hibernate may fail to produce reproductive brood or may have shortened lifespans, As a mountain species, they may be sensitive to humidity extremes, both overly dry and waterlogged conditions can cause problems, Slow growth compared to tropical species means beginners may lose patience and overfeed, leading to mold issues

Natural History and Distribution

Myrmica orthostyla is a Central Asian mountain species found primarily in Kyrgyzstan and adjacent regions of the Russian Federation. It lives at remarkably high altitudes around 2500 meters in various mountain steppe habitats. The species was first described by Arnol'di in 1976 and belongs to the Myrmica tibetana species group, which is characterized by their distinctive straight propodeal spines. The species name literally means 'straight pillar' referring to these thin, straight spines that distinguish it from related species like Myrmica tenuispina. Nests are constructed in soil, typically located under stones which provide protection and help moderate temperature fluctuations in the harsh mountain environment. Males have been found in nests during September, indicating that mating flights occur in late summer (August-September), which is later than many lowland Myrmica species ^[1].

Nest Preferences and Housing

In the wild, Myrmica orthostyla nests in soil under stones in mountain steppe habitats. For captive care, this translates well to several established setups. A Y-tong (AAC) nest with narrow chambers works well, as does a plaster nest with soil chambers. You can also create a naturalistic setup with a layer of soil substrate and flat stones on top, which mimics their natural environment. The key is providing a nest area that stays cool and stable, avoid placing the nest in direct sunlight or near heat sources. Since they're from high altitudes, they don't need heating cables like tropical species do. Room temperature (18-22°C) is typically ideal. Make sure the nest has some moisture in the substrate but also dry areas they can move to if needed. ^[1]

Feeding and Diet

Like other Myrmica species, Myrmica orthostyla is omnivorous with a preference for protein-rich foods. In captivity, they readily accept small live insects like fruit flies, pinhead crickets, and mealworms. They also collect honeydew and will take sugar water or diluted honey. Feed protein prey 2-3 times per week, and keep a constant sugar source available. Fresh water should always be accessible. Because they're a moderate-sized Myrmica, avoid prey items that are too large, stick to appropriately sized insects. Remove any uneaten prey after 24 hours to prevent mold issues. ^[1]

Temperature and Seasonal Care

This is one of the most important aspects of keeping Myrmica orthostyla successfully. As a high-altitude mountain species, they are adapted to cooler conditions than most ant species. Keep the nest area at 18-22°C, this is cooler than many antkeepers instinctively maintain. Avoid any temperatures above 25°C, as this can stress and potentially kill colonies. A temperature gradient allowing workers to choose cooler areas is ideal. During winter, they require a proper hibernation period of 3-4 months at 5-10°C. This diapause is essential for colony health and reproductive development. Place them in a cool location like an unheated garage or basement during winter, or use a refrigerator for smaller colonies. ^[1]

Colony Development

Myrmica orthostyla follows typical Myrmica colony development. The claustral queen seals herself in a chamber and raises the first brood using stored fat reserves. First workers (nanitics) are typically smaller than mature workers. Based on related species, expect 6-10 weeks from egg to first worker at optimal temperatures. Growth rate is moderate, not as fast as tropical species but steady under proper conditions. Colonies likely reach several hundred workers over several years. The key to healthy development is maintaining proper cool temperatures and providing adequate protein. Males are produced in late summer in preparation for nuptial flights, which is consistent with the September male observations in wild colonies. ^[1]

Frequently Asked Questions

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References