Myrmecina americana

Myrmecina americana - "American Mite-eating Ant"

Myrmecina americana is a tiny, dark ant native to forests across eastern North America. Workers measure 3.0-3.7mm total length and are a very dark reddish-brown to blackish-brown with paler legs and antennae. Their body has a distinctly sculpted, weakly glossy appearance with longitudinal ridges on the head. These ants are cryptobiotic, they live hidden in leaf litter, soil, and rotting wood, and their slow-moving workers are known for feigning death when disturbed, making them incredibly hard to spot in the wild ^[1]. This species is a specialized predator that feeds almost exclusively on tiny oribatid mites, making them an interesting but challenging species to keep ^[2][3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to eastern North America, found from Quebec south to Georgia and west to Colorado, New Mexico, and California. Inhabits deciduous and mixed forests, typically nesting in moist shady areas under rocks, in rotting logs, in soil, and inside acorns ^[1][4][5].
• Colony Type: Single-queen colonies (monogyne) with small colony sizes of typically under 100 workers. The species exhibits queen polymorphism with intermorphic queens, intermediate forms between workers and normal queens that can still reproduce ^[6][7].
• Size & Growth:
  • Queen: Size data unavailable, the species has intermorphic queens that are morphologically intermediate between workers and full gynomorph queens ^[7].
  • Worker: 3.0-3.7mm total length ^[1][8]
  • Colony: Rarely exceeds 100 workers, typical colonies contain around 20-50 individuals ^[1][9]
  • Growth: Slow, small colony size and specialized diet limits growth speed
  • Development: Development timeline unconfirmed for this species. (Based on typical Myrmicinae patterns, expect several months at warm room temperature. Small colony sizes suggest slower development.)
• Antkeeping:
  • Temperature: Keep at room temperature, roughly 20-24°C. This is a temperate forest species that tolerates a range of conditions but prefers cooler temperatures than tropical ants. Avoid overheating.
  • Humidity: Requires moderate to high humidity. Keep the nest substrate consistently moist but not waterlogged. These ants naturally live in moist forest floor environments, the substrate should feel damp to the touch.
  • Diapause: Yes, as a temperate species, they require a winter rest period. Reduce temperature to around 10-15°C for 2-3 months during winter, mimicking natural seasonal cycles.
  • Nesting: Prefers naturalistic setups with moist substrate. Y-tong or plaster nests work well. They naturally nest in rotting wood, soil, and under stones in damp forest environments. Provide a small, humid nest chamber with access to a foraging area.
• Behavior: Workers are slow-moving and cryptic. They forage in leaf litter and soil rather than on open trails. When disturbed, they feign death by remaining motionless, this is a defense mechanism that makes them difficult to detect ^[1]. They are not aggressive and have no sting. Escape risk is low since they are small but relatively sedentary. However, their tiny size means standard test tube setups may need careful attention to prevent escapes.
• Common Issues: specialized diet makes them difficult to feed, they primarily eat tiny mites which are hard to provide in captivity, slow growth and small colony sizes mean colonies develop very gradually, requiring patience, wild-caught colonies may struggle to adapt to captive conditions after being collected from deep forest litter, their cryptic behavior means you may not see much activity, leading keepers to think something is wrong when the colony is actually healthy, they are sensitive to drying out and require consistently moist substrate

Housing and Nest Setup

Myrmecina americana is a cryptic forest floor species that requires a naturalistic setup with good humidity control. A Y-tong or plaster nest works well, both hold moisture and provide the dark, enclosed spaces these ants prefer. The nest chamber should be small since colonies stay small. Keep the nest substrate consistently moist but never waterlogged, these ants naturally live in damp forest litter and rotting wood. A small water reservoir connected to the nest helps maintain humidity. For the outworld, provide a shallow foraging area with leaf litter, small pieces of rotting wood, and moist soil. This gives them hiding spots and mimics their natural forest floor habitat. Use a tight-fitting lid as even their small size allows them to squeeze through small gaps ^[1][9].

Feeding and Diet

This is the most challenging aspect of keeping Myrmecina americana. They are specialized predators that feed almost exclusively on oribatid mites, tiny soil mites that live in leaf litter ^[2][3]. In captivity, you can try offering small live prey like springtails, but acceptance is uncertain. Some keepers report success with tiny fruit flies and other very small insects. They are not known to tend honeydew-secreting insects or accept sugar sources readily ^[1]. Feed small prey items sparingly and remove uneaten prey to prevent mold. Given their specialized diet, this species is best suited for experienced antkeepers who can provide a steady source of appropriate live prey. Do not rely on sugar water or honey, these ants are primarily predatory.

Temperature and Seasonal Care

As a temperate forest species, Myrmecina americana does best at cool to moderate temperatures around 20-24°C. They are not heat-tolerant and should be kept away from direct heat sources. During the summer months, room temperature is usually ideal. In winter, they require a diapause period, reduce temperatures to around 10-15°C for 2-3 months to mimic natural seasonal cycles. This winter rest is important for colony health and reproduction. Place the colony in a cool basement or refrigerator (not freezer) during this period. Do not feed during diapause. Return them to normal temperatures gradually in spring.

Behavior and Observation

Myrmecina americana workers are slow-moving and spend most of their time foraging through leaf litter and soil. When disturbed, they exhibit thanatosis, they freeze and feign death, remaining motionless for extended periods. This is a defense mechanism that makes them difficult to spot in the wild and can be alarming to new keepers who think their ants have died ^[1]. They are not aggressive and do not sting. Their cryptic nature means you may not see dramatic colony activity, this is normal for the species. Colonies remain small (under 100 workers) even at maturity. The presence of intermorphic queens means some colonies may have multiple reproductive individuals that are intermediate in morphology between workers and full queens ^[7].

Finding and Collecting

In the wild, Myrmecina americana is notoriously difficult to find despite being common. Nests are hidden under rocks, in rotting logs, in soil, and even inside acorns on the forest floor ^[1][4]. Workers forage individually in leaf litter and rarely venture into open areas. The best way to find them is by sifting leaf litter and soil from deciduous forests and using Berlese funnels to extract the tiny ants. If you find a colony, collect the queen and as many workers as possible. Wild colonies often struggle to adapt to captivity, so expect a difficult adjustment period. Consider purchasing from an ant breeder rather than collecting from the wild if you want a more established colony.

Frequently Asked Questions

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References