Myrmica eidmanni

Quick Summary

• Difficulty: Easy
• Origin & Habitat: South Siberia (Altai Mountains), Mongolia, Russian Far East, Korean Peninsula, and NE China. This species avoids dense forests and prefers open anthropogenic environments like grasslands, forest clearings, roadsides, riverbanks, sandy lakeshores, and peat bogs. It also inhabits sparse pine and larch forests and their edges, nesting in soil often under stones and in soil or moss mounds ^[3].
• Colony Type: Moderately polygynous, colonies contain 1-5 queens working together, with an average of around 500 workers ^[3].
• Size & Growth:
  • Queen: Approximately 5-6mm (estimated based on worker size and genus patterns)
  • Worker: 5.3mm ^[1]
  • Colony: Up to 500 workers on average ^[3]
  • Growth: Moderate
  • Development: 6-10 weeks (estimated based on typical Myrmica development patterns) (Development time depends on temperature, warmer conditions within the acceptable range accelerate development)
• Antkeeping:
  • Temperature: Keep at room temperature, ideally 20-24°C. As a temperate species from southern Siberia and Mongolia, they can tolerate cooler conditions but grow best in a mild temperature range. A slight gradient allowing workers to choose their preferred warmth is beneficial.
  • Humidity: Moderate humidity around 50-70%. These ants prefer somewhat damp nest conditions but not waterlogged. Keep the nest substrate moist but allow some drying between waterings. They do well with the occasional misting or water reservoir.
  • Diapause: Yes, this temperate species requires a winter dormancy period. Reduce temperature to 5-10°C for 3-4 months during winter (roughly October-March in the Northern Hemisphere). This mimics their natural cycle in the Taiga Zone and is essential for colony health and sexual production ^[3].
  • Nesting: Use a naturalistic setup with soil or a gypsum/plaster nest. They nest in soil in the wild, often under stones, so a nest with a soil chamber or compact dirt area works well. Test tube setups work for founding colonies but transfer to a more naturalistic setup as the colony grows. They do well in formicariums with moderate moisture-retaining substrate.
• Behavior: Myrmica eidmanni has a typical Myrmica temperament, they are not aggressive but will defend their nest if threatened. Workers are moderately active and forage for protein (insects) and sugar sources. They are not particularly escape-prone but standard containment measures should still be used. These ants are day-active foragers that benefit from a clear day-night cycle. They are moderately polygynous, meaning multiple queens can coexist in established colonies.
• Common Issues: queen loss during founding is common if humidity drops or the colony is disturbed, hibernation failure if temperatures don't drop sufficiently or if the colony is disturbed during dormancy, mold in overly wet nests, balance moisture carefully, slow initial growth can lead to keeper impatience and overfeeding, which causes mold problems, wild-caught colonies may contain parasites that can devastate captive populations

Nest Preferences and Setup

In the wild, Myrmica eidmanni nests in soil, often under stones, and in soil and moss mounds in grassland and forest edge habitats ^[3]. For captive care, a naturalistic setup with a soil chamber works best, this allows the ants to create their own tunnels and chambers just as they would in nature. You can use a formicarium with a dirt section or a hybrid setup that combines a clear viewing area with soil for nesting.

For founding colonies, a standard test tube setup works well. Keep the tube dark (wrap with foil or place in a dark container) and maintain humidity by ensuring the water reservoir doesn't dry out. Once the colony reaches 10-20 workers, you can transfer to a more naturalistic formicarium with moist soil. The nest should have areas of varying moisture, slightly damp for the brood chambers and drier areas for food storage. Avoid completely dry conditions as these ants prefer moderate humidity.

A small outworld (foraging area) connected to the nest allows you to feed and observe the colony. Use a barrier like fluon on the edges to prevent escapes, though these ants are not particularly prone to climbing smooth surfaces like some arboreal species.

Feeding and Diet

Myrmica eidmanni is a typical Myrmica ant, they are omnivorous with a preference for protein. In the wild, they forage for small insects and other arthropods, and they also collect honeydew from aphids and scale insects. For captive colonies, offer a varied diet:

Protein sources: Small live or dead insects work best. Flightless fruit flies, small crickets, mealworms, and waxworms are all appropriate. Feed protein 2-3 times per week, adjusting based on colony size. Remove uneaten prey after 24-48 hours to prevent mold.

Sugar sources: Myrmica ants readily accept sugar water, honey, or diluted maple syrup. Offer a small amount of sugar water on a cotton ball or in a shallow container 2-3 times per week. Sugar is especially important during brood production when the colony needs extra energy.

Fresh water should always be available, a small water tube with a cotton plug works well.

Avoid overfeeding, the biggest mistake keepers make is offering too much food, which leads to mold growth in the nest. Only offer what the colony can consume within a day or two.

Temperature and Seasonal Care

As a temperate species from southern Siberia and Mongolia, Myrmica eidmanni is adapted to seasonal temperature changes. Keep the colony at room temperature, ideally in the range of 20-24°C. They can tolerate temperatures slightly outside this range but growth and activity will slow at cooler temperatures.

During the summer active season (roughly May through September), normal room temperature is fine. You can create a slight temperature gradient by placing a heating cable on one side of the nest, this allows workers to regulate their own temperature by moving between warmer and cooler areas.

Winter dormancy is essential for this species. From roughly October through March, reduce temperatures to 5-10°C. This can be achieved by moving the colony to a cool basement, garage, or refrigerator (not freezer). During hibernation, the colony will be largely inactive, this is normal. Do not feed during hibernation but ensure the nest remains slightly moist. The cold period is necessary for colony health and triggers the production of sexual forms (males and queens) ^[3].

If you skip hibernation, the colony may become stressed and fail to produce healthy sexuals, though it can still survive for several years without proper dormancy.

Behavior and Colony Dynamics

Myrmica eidmanni is a moderately polygynous species, meaning established colonies typically have multiple queens (1-5) working together ^[3]. This is different from many ant species where multiple queens result in fighting, in M. eidmanni, the queens cooperate and share reproductive duties. This makes the colony more resilient to queen loss and allows for faster colony growth.

Workers are not particularly aggressive but will defend the nest if threatened. Unlike some Myrmica species that have painful stings, these ants are less aggressive and their sting is mild (though individual reactions vary). They are moderate foragers and will send workers out to collect food in the outworld.

The colony grows at a moderate pace, expect 6-12 months from founding to the first workers (nanitics), and another year or two to reach moderate size (100-300 workers). Maximum colony size is around 500 workers. Sexual production (males and new queens) typically occurs in late summer, with nuptial flights in August-September ^[3].

When introducing new queens to an existing colony, proceed with caution. Unlike some polygynous species, M. eidmanni queens may fight if introduced improperly. However, established multi-queen colonies are generally peaceful.

Frequently Asked Questions

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References