Myrmecina graminicola

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Europe and the Mediterranean region, from Sweden and southern England east to the Caucasus and south to northwest Africa. Found in light deciduous forests, calcareous grasslands, gardens, and open habitats with stones ^[7][8].
• Colony Type: Small colonies typically with a single queen (monogynous), though multiple queens (polygynous) colonies occur occasionally. Queen polymorphism is common, both winged queens (gynomorphs) and wingless intermorphs can function as reproductive females in the same colony ^[5][9].
• Size & Growth:
  • Queen: 3.5-4.2 mm ^[10]
  • Worker: 2.4-3.2 mm ^[1]
  • Colony: Typically 30-50 workers, maximum around 100 ^[11][4]
  • Growth: Slow
  • Development: Approximately 12-14 months (larvae overwinter as diapause, first workers emerge the following year) ^[12][13] (Semi-claustral founding with slow larval development. Larvae enter diapause (winter rest) and first workers emerge the following spring ^[12][13].)
• Antkeeping:
  • Temperature: Keep at room temperature (18-24°C). This is a thermophilic species that prefers warm conditions but can tolerate cooler temperatures in captivity ^[8].
  • Humidity: Moderate to high humidity. In the wild, they inhabit leaf litter and soil in forested areas. Keep the nest substrate consistently moist but not waterlogged ^[11].
  • Diapause: Yes, requires a winter dormancy period. In nature, larvae overwinter and egg-laying occurs after diapause in spring. Provide 2-3 months at 5-10°C during winter ^[1][12].
  • Nesting: Small, shallow nests in soil, under stones, or in leaf litter. Y-tong (AAC) nests or plaster nests work well. Provide a thin layer of moist substrate and hiding spots like small stones or pieces of bark ^[11][14].
• Behavior: Very cryptic and slow-moving. Workers forage individually in the leaf litter layer rather than on open trails. When disturbed, they immediately curl into a ball and remain motionless, this is their primary defense. They are not aggressive and rarely bite. Colonies are small and inconspicuous ^[3][14]. Escape risk is low as workers are slow and small but can squeeze through small gaps, use standard barrier methods.
• Common Issues: small colony size makes them vulnerable to stress, avoid disturbing the nest frequently, their slow movement and cryptic behavior means they may be overlooked when foraging, ensure food is placed where they'll find it, winter diapause is essential, colonies that are kept warm year-round may fail to produce workers properly, their rolling defense works against predators but makes them seem inactive or dead when you're trying to observe them, due to their small size and subterranean habits, they are easily overlooked and may be accidentally crushed when handling

Housing and Nest Setup

Myrmecina graminicola does best in small, naturalistic setups that mimic their natural leaf litter habitat. A Y-tong (AAC) nest or plaster nest with a small chamber works well. Fill the outworld with a thin layer of moist soil or sand mixed with leaf litter. Provide hiding spots like small stones, pieces of bark, or artificial leaves. Because they are small and slow, avoid large open spaces in the outworld, they may have trouble finding food. A small test tube setup can work for founding colonies, but transfer to a proper nest once the colony reaches 15-20 workers. They prefer darkness and will nest under stones or in covered areas ^[11][14].

Feeding and Diet

This species is primarily predatory, hunting small invertebrates in the leaf litter. Offer small live prey like fruit flies, springtails, or tiny crickets. They also accept protein paste or crushed insects. Unlike many ants, they do not tend aphids for honeydew, though they may occasionally drink sugar water or honey. Feed small amounts 2-3 times per week, removing any uneaten prey after 24 hours. Their slow movement means they may not compete well for food with faster ants if kept in a shared setup ^[14][8].

Temperature and Seasonal Care

Keep the nest at room temperature (18-24°C). They are thermophilic and prefer warmer spots, but will do fine in typical room conditions. In winter, they require a diapause period of 2-3 months at 5-10°C. Reduce feeding during this time and keep the nest slightly cooler. Place the nest in a location that stays cool in winter but warm in summer. Do not feed during the deepest part of diapause. After winter, gradually warm the colony back to room temperature, this triggers egg-laying ^[1][12].

The Rolling Defense Behavior

The most distinctive behavior of Myrmecina graminicola is their rolling escape response. When touched or threatened, workers immediately curl into a tight ball and remain motionless, this is called thanatosis or playing dead. On inclined surfaces, they can actually roll away from danger at surprising speed (about 40 cm/s). Research shows they roll when the slope exceeds 10° and the stimulus involves vibration. This behavior is highly effective, on inclined planes, only 10% of ants were injured compared to 63% on horizontal surfaces when attacked by other ants. In captivity, don't be alarmed if your ants appear 'dead', they will uncurl once they feel safe ^[3].

Queen Polymorphism

This species exhibits remarkable queen polymorphism. Colonies can have either normal winged queens (gynomorphs) or wingless intermorphs that resemble workers but have reproductive organs. Both types can coexist in the same colony, and intermorphs can produce both workers and sexuals. This is genetically determined and appears to be widespread throughout the species range. In captivity, you may notice some queens are larger and winged while others are smaller and wingless, both can establish colonies successfully ^[5][6].

Frequently Asked Questions

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References