Myrmelachista amicta

Myrmelachista amicta

Myrmelachista amicta is a tiny arboreal ant species native to Mexico, specifically recorded from Veracruz ^[1]. Workers measure just 1.5-1.75mm, making them one of the smaller ant species you'll encounter ^[2]. They have an unusual 9-segmented antenna (most ants have 12), and their coloration is distinctive: deep chestnut brown body with reddish markings on the head and pronotum, yellow legs and antennae, and dark femora ^[2]. These ants live in plant structures, the type specimens were collected from Tillandsia balfisiana (a bromeliad) and hollow plant stems ^[2]. This arboreal nesting habit means they're adapted to humid, sheltered microhabitats within vegetation.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Mexico, specifically Veracruz state in the Neotropical region ^[1]. They nest in plant cavities like bromeliads and hollow stems ^[2], indicating they prefer humid arboreal microhabitats.
• Colony Type: Unconfirmed, colony structure has not been documented for this species. Based on typical Myrmelachista patterns, they likely form small single-queen colonies.
• Size & Growth:
  • Queen: Undocumented, no queen measurements available
  • Worker: 1.5-1.75mm ^[2]
  • Colony: Unknown, likely small based on related species and their tiny worker size
  • Growth: Unknown
  • Development: Unconfirmed, estimates based on related Formicinae suggest 6-10 weeks at warm temperatures, but no direct data exists for this species (Growth rate is unconfirmed due to lack of captive breeding studies)
• Antkeeping:
  • Temperature: Keep around 22-26°C, these are Neotropical ants from Veracruz, a warm region. A gentle heat gradient allows them to regulate temperature.
  • Humidity: High humidity is essential, they naturally live in bromeliad axils and plant stems where moisture collects. Keep nest substrate consistently moist but not waterlogged.
  • Diapause: Unknown, being from tropical Mexico, they may not require true hibernation but might reduce activity in cooler months.
  • Nesting: Best kept in setups that mimic their natural plant-stem habitat. Y-tong nests with narrow chambers, small acrylic nests, or test tube setups with plant material work well. They need tight chambers scaled to their tiny 1.5mm size.
• Behavior: These are tiny, docile arboreal ants. They are not aggressive and likely have mild defense mechanisms. Their small size means they pose no sting threat to humans. Escape prevention is critical, at 1.5-1.75mm, they can squeeze through remarkably small gaps. Use fine mesh barriers and ensure all connections are sealed. They probably forager slowly and methodically in plant material rather than actively hunting.
• Common Issues: escape prevention is critical, their tiny 1.5mm size means they can squeeze through gaps that seem sealed, no captive breeding data exists, establishing a colony from a wild-caught queen may be challenging, humidity management is tricky, they need high humidity but also ventilation to prevent mold, growth rate is unknown, beginners may struggle without benchmarks for expected development, wild-caught colonies may have parasites that kill them in captivity

Housing and Nest Setup

Myrmelachista amicta is an arboreal species that naturally lives in plant cavities, particularly bromeliads and hollow stems ^[2]. For captivity, recreate this microhabitat using Y-tong nests with narrow chambers, small acrylic formicaria, or test tube setups with added plant material. The key is tight chambers scaled to their tiny 1.5-1.75mm worker size, avoid tall, open spaces. Include small pieces of cork or plant material in the outworld to provide foraging surfaces. Because they're so small, even standard test tube connections can be escape points, use cotton plugs changed daily or fine mesh barriers on all openings. A small outworld works best since the colony will likely remain modest in size.

Temperature and Humidity

Being from Veracruz, Mexico, a warm Neotropical region, these ants need temperatures in the 22-26°C range. A heating cable on one side of the nest creates a gradient for the colony to self-regulate. Place the heating on top of the nest, not underneath, to avoid evaporating moisture too quickly. Humidity is critical: they naturally live in bromeliad axils where moisture collects, so keep the nest substrate consistently moist. Use a water reservoir connected to the nest to maintain humidity without daily misting. However, balance is essential, excessive moisture causes mold, while drying out can kill the colony quickly given their small size and likely shallow nest chambers. ^[1]

Feeding and Diet

No specific dietary studies exist for this species, but Myrmelachista genus members are typically generalist foragers that collect honeydew from aphids and scale insects, plus small insects. In captivity, offer sugar water or honey diluted with water at all times. For protein, provide tiny prey items like fruit flies, pinhead crickets, or small mealworm pieces. Because workers are only 1.5mm, prey must be appropriately sized, springtails or aphids are ideal. Feed small amounts twice weekly and remove uneaten prey within 24 hours to prevent mold in the humid setup. Monitor acceptance carefully since there's no captive data for this species.

Handling and Temperament

These are tiny, docile ants with no known sting capability, at 1.5mm, their mandibles are too small to penetrate human skin effectively. They are not defensive and won't attack when the nest is opened. The primary concern is their extremely small size making escape prevention challenging. Always work over a white surface when transferring or feeding to spot any escapes. Close observation requires good lighting and magnification since workers are barely visible to the naked eye. They move slowly and methodically rather than darting frantically, which makes them easier to observe but also means they may not quickly claim food items. ^[2]

Colony Establishment

Establishing Myrmelachista amicta in captivity presents challenges since no captive breeding data exists. If you obtain a wild-caught queen, she was likely found in a bromeliad or plant stem ^[2]. Provide a small test tube with moist cotton as a founding chamber. Since founding behavior is unconfirmed, assume claustral (queen seals herself in and lives off stored fat) as is typical for Formicinae. Keep the setup dark and undisturbed for 4-6 weeks before checking. Wild-caught colonies may carry parasites that prove fatal in captivity, quarantine and observe new colonies carefully. Success rates are unknown, making this a species for patient, experienced keepers willing to experiment.

Frequently Asked Questions

References