Aphaenogaster kumejimana

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Kume Island, Ryukyu Islands, Japan, found only in this specific location ^[2][1]. Nests in rotting wood and tree holes in subtropical forest ^[1].
• Colony Type: Colony type unconfirmed. Based on typical Aphaenogaster patterns, likely single-queen (monogyne).
• Size & Growth:
  • Queen: Size data unavailable, inferred from Aphaenogaster genus to be approximately 6-8 mm.
  • Worker: 4.5-5.5 mm ^[1].
  • Colony: Unknown for this species. Based on typical Aphaenogaster patterns, likely up to several hundred workers.
  • Growth: Moderate
  • Development: Approximately 8-12 weeks at 24-25°C, inferred from related temperate Aphaenogaster species. (Development time is unconfirmed for this specific species.)
• Antkeeping:
  • Temperature: Keep at 22-26°C during the active season. Provide a winter rest period at 15-18°C for 2-3 months based on their extratropical distribution at 27°N latitude ^[2].
  • Humidity: Moderate to damp. Nest material should feel like fresh rotting wood, moist but not waterlogged ^[1].
  • Diapause: Likely yes, recommended winter cooling based on their Japanese origin and extratropical distribution ^[2].
  • Nesting: Rotting wood and tree holes in nature ^[1]. In captivity, use Y-tong, plaster, or naturalistic nests with wood features and enclosed chambers.
• Behavior: Peaceful with moderate activity levels. Workers show death-feigning (thanatosis) when disturbed, they freeze and roll over, appearing dead ^[1]. They forage with gasters turned downward ^[1]. Medium escape risk, workers are small enough to squeeze through gaps.
• Common Issues: workers playing dead can be mistaken for actual deaths, tap the container gently to check if they move before removing them., limited captive breeding data means care requirements are experimental and based on inference from related species., subtropical origin means they need seasonal temperature variation but not harsh freezing conditions., escape prevention is needed for 4.5-5.5mm workers, use fine mesh and tight-fitting lids., this species is endemic to a single island, ensure your source is reputable and verifies collection location.

Nest Preferences

In nature, Aphaenogaster kumejimana nests in rotting wood and tree holes ^[1]. This means they prefer enclosed spaces with wood-like textures and moderate humidity. In captivity, a Y-tong (aerated concrete) nest with narrow chambers works well, as does a plaster nest or a naturalistic setup with pieces of rotting wood. Keep the nest material moderately damp, it should feel like fresh rotting wood, moist but not dripping wet. Provide tight-fitting spaces rather than open areas, as these ants naturally live in crevices and cavities. A test tube setup works well for founding colonies and small colonies, but move them to a more spacious nest with wood features as they grow.

Feeding and Diet

While specific diet studies are lacking for this species, Aphaenogaster ants are generally omnivorous scavengers. They likely feed on dead insects, small live prey, and possibly seeds in the wild. In captivity, offer small pieces of mealworms, crickets, or fruit flies. Provide sugar water or honey water in a test tube or small feeder. Watch the colony to see what they accept, start with dead insects and offer live small prey if they show hunting behavior. Remove uneaten food within 24-48 hours to prevent mold growth in the humid conditions they prefer.

Temperature and Seasonal Care

Coming from Kume Island at 27°N latitude, these ants experience subtropical conditions with mild winters ^[2]. Keep them at 22-26°C during the active season. For winter care, lower temperatures to 15-18°C for 2-3 months to simulate their natural seasonal cycle. This diapause (winter rest) period helps maintain natural breeding cycles, though the exact requirements are unconfirmed. Use a heating cable on one side of the nest to create a temperature gradient, but place it on top rather than underneath to avoid drying out the nest material. Avoid letting them get too hot (over 28°C) or too cold (under 10°C).

Behavior and Death-Feigning

These ants show two distinctive behaviors that make them fascinating to watch. First, they forage with their gasters (abdomens) pointed downward ^[1], unlike most ants that hold them level or raised. Second, when disturbed or threatened, workers perform death-feigning (thanatosis), they freeze, curl up, and roll onto their backs, appearing completely dead ^[1]. This can last from seconds to minutes. Do not mistake this for actual death, gently tap the container and they will spring back to life. They are generally peaceful toward keepers and show low aggression. Workers are active foragers and will explore their outworld thoroughly.

Frequently Asked Questions

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References