Myrmecina andalas

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Sumatra, Indonesia, leaf litter in secondary forests at 950-1200m elevation ^[1]
• Colony Type: Single-queen colonies with ergatoid replacement reproductives documented. Ergatoid queens are wingless but fully reproductive and can replace dealate queens if needed ^[1].
• Size & Growth:
  • Queen: Approximately 2.5-3mm total length, inferred from head measurements (HL 0.92mm, HW 1.09mm) ^[1]
  • Worker: Approximately 2-2.5mm total length, inferred from head measurements (HL 0.90mm, HW 1.00-1.02mm) ^[1]
  • Colony: Unknown, likely small to moderate based on genus patterns
  • Growth: Unknown, likely moderate
  • Development: Unknown, no development data available for this species (No direct development data available for this species.)
• Antkeeping:
  • Temperature: Keep warm at 24-28°C. Being from tropical Sumatra, they need stable warmth similar to their native leaf litter environment.
  • Humidity: High humidity required, think damp forest floor. Keep nest substrate consistently moist but not waterlogged. Provide a humidity gradient with a moist side and slightly drier area.
  • Diapause: No, being a tropical species from low latitude Sumatra, they do not require a diapause period.
  • Nesting: Y-tong or plaster nests work well for these small litter ants. They prefer tight chambers scaled to their size. A naturalistic setup with leaf litter and moist substrate also mimics their natural environment.
• Behavior: These are cryptic, slow-moving ants that spend most of their time in the nest or foraging quietly through the substrate. They are not aggressive and rarely venture into the open. Workers have functional stings but are too small to penetrate human skin effectively. Escape risk is moderate, their small size means they can slip through small gaps, so use fine mesh and tight-fitting lids. They are not aggressive colony defenders. As Myrmicinae, they have a modified stinger used to smear venom rather than pierce flesh.
• Common Issues: high humidity needs make them prone to mold if ventilation is poor, small size means escape prevention must be good despite their docile nature, lack of available care information means keepers are essentially pioneering husbandry, tropical species may struggle if temperatures drop below 22°C, wild-caught colonies may harbor parasites from leaf litter environment

Nest Preferences

In their natural habitat, Myrmecina andalas lives in leaf litter on the forest floor, where they nest in moist soil and decaying organic matter at elevations around 950-1200m ^[1]. For captive care, Y-tong or plaster nests work well because they allow you to control humidity precisely. These ants prefer tight, narrow chambers that match the confined spaces they naturally inhabit. A naturalistic setup with a layer of moist soil, leaf litter, and small hiding spots can also work well and encourages natural foraging behaviors. Whatever nest type you choose, ensure the chambers are appropriately sized, these are small ants, so passages and chambers should be scaled accordingly. Keep the nest area consistently moist since they come from a humid tropical environment.

Feeding and Diet

Myrmecina andalas is a generalist forager like other Myrmecina species. In captivity, they will accept small protein sources like fruit flies, small crickets, mealworms, and other tiny arthropods. They likely also consume honeydew from aphids and may accept sugar water or honey as an energy source. Feed them small prey items appropriate to their size, these are tiny ants, so portion sizes should match. Offer protein 2-3 times per week and keep a sugar source available at all times. Remove uneaten prey after 24-48 hours to prevent mold issues in their humid environment. Since they are cryptic foragers, place food near their nest entrance where they can find it easily.

Temperature and Care

Being from tropical Sumatra, Myrmecina andalas needs warm conditions. Keep the nest area at 24-28°C for optimal colony health and activity. A heating cable or mat on one side of the nest can create a gentle temperature gradient, allowing the ants to regulate their own temperature by moving between warmer and cooler areas. Avoid temperatures below 22°C for extended periods, as this species is not adapted to cool conditions. Room temperature may be suitable if your home stays in the mid-70s°F (around 24°C), otherwise provide supplemental heating. Stable temperatures are important, avoid drafts and sudden temperature changes. Unlike temperate species, they do not require a winter diapause period.

Behavior and Temperament

Myrmecina andalas is a docile, cryptic species that is not aggressive toward keepers. Workers are slow-moving and spend much of their time within the nest or moving carefully through the substrate. They are not known for aggressive colony defense, and their sting is ineffective on human skin due to their small size. However, their tiny size means they can escape through very small gaps, so escape prevention is important despite their calm nature. They are not prolific climbers and are unlikely to escape from smooth-walled nests, but fine mesh on any openings is still recommended. Colonies are relatively quiet and won't produce the dramatic foraging trails seen in some larger ant species. ^[1]

Colony Structure and Reproduction

A unique feature of Myrmecina andalas is the presence of ergatoid queens, wingless replacement queens that develop in established colonies. Unlike typical dealate (winged) queens that fly out to start new colonies, ergatoid queens are born wingless and remain in the nest, ready to take over reproduction if the primary queen dies or becomes infertile. This is a common system in the genus Myrmecina. The ergatoid queen can be identified by her three ocelli (simple eyes on the top of the head) and a small hole where wings would have attached (vestige of wing articulation). She is similar in size to workers but has larger eyes (EL 0.27mm vs 0.24mm in workers) and more ommatidia (85 vs 72-73) ^[1]. In captivity, you may eventually see ergatoid queens develop as the colony matures. The colony structure appears to be primarily single-queen, with ergatoids serving as backup reproductives.

Acclimation and Handling

When acquiring Myrmecina andalas, whether as a colony or queen, give them time to settle into their new environment. Avoid disturbing the nest frequently, especially during the founding stage. If you receive a founding queen, keep her in a quiet, dark location at appropriate temperature and humidity until her first workers (nanitics) emerge. These ants are sensitive to vibrations and disturbances, so place their enclosure away from high-traffic areas, speakers, and other sources of vibration. Once established, they are relatively hardy but will thrive best with consistent conditions and minimal interference. Watch for signs of stress like workers fleeing the nest or decreased activity, which may indicate temperature or humidity problems.

Frequently Asked Questions

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References