Cardiocondyla subspina

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Indonesia (Seram), tropical lowland forest below 500m elevation, likely arboreal foragers ^[1]
• Colony Type: Unknown, no colony data exists. Only two worker specimens have ever been collected ^[1].
• Size & Growth:
  • Queen: Unknown, queens have never been described ^[1]
  • Worker: ~2 mm (inferred from Cardiocondyla genus) ^[1]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown (No developmental data exists.)
• Antkeeping:
  • Temperature: Likely 25-28°C based on tropical lowland origin at 3°S latitude ^[1]
  • Humidity: High humidity likely needed given collection via fogging in forest environment ^[1]
  • Diapause: No, tropical equatorial species with no seasonal cold period ^[1]
  • Nesting: Unknown, arboreal collection suggests they may prefer vertical surfaces or elevated chambers ^[1]
• Behavior: Unknown temperament. Extreme escape risk due to tiny size, they can pass through gaps that would stop most other ants ^[1]
• Common Issues: extreme escape risk, at ~2mm they can pass through standard mesh and small gaps, complete lack of captive care data, no one has successfully kept this species in captivity, likely unavailable in ant trade, only two specimens exist in museum collections, desiccation risk, tiny ants lose moisture rapidly without consistent high humidity, feeding challenges, prey size must be extremely small, likely requiring springtails or micro-flies

Extreme Rarity and Data Limitations

Cardiocondyla subspina is known from only two worker specimens, a holotype and paratype collected in 1987 during Operation Raleigh in Manusela National Park ^[1]. No queen has ever been described, no nest has been found, and no behavioral observations exist beyond the fact that they were collected via canopy fogging ^[1].

This means virtually everything about their care is unknown. If you somehow obtain this species, you would be the first person to attempt keeping them. Any care guidelines here are extrapolated from their tropical origin and genus patterns, not from actual husbandry experience.

Housing and Escape Prevention

At approximately 2mm long, these ants present a significant escape risk. Standard 0.5 mm mesh may be too large, they could walk right through the holes. You would need steel wool barriers, extremely tight-fitting test tube cotton plugs, or glass containers with Vaseline barriers applied with zero gaps ^[1].

Given the fogging collection suggesting arboreal habits, they might prefer vertical test tube setups or formicariums with climbing surfaces rather than ground-level nesting ^[1]. However, this is speculative. Any enclosure must be absolutely sealed, if you can see a gap, they can escape through it.

Environmental Conditions

Coming from tropical Seram at low elevation (below 500m) near the equator (3°S), these ants likely need warm, stable temperatures around 25-28°C year-round with no cooling period ^[1]. They probably require high humidity consistent with rainforest canopy environments, though not waterlogged conditions ^[1].

Without diapause (winter rest), they would remain active year-round if temperatures stay stable. A heating cable on one side of the nest could provide a gentle gradient, but given their unknown biology, start with uniform warmth around 26°C.

Feeding

Their diet is completely unknown. The arboreal collection suggests they might feed on honeydew from scale insects or treehoppers in the canopy, or possibly tiny arthropods ^[1]. In captivity, you would need to experiment with extremely small prey: springtails (Collembola), micro-flies, or possibly dissolved honey water offered on tiny droplets.

Given their size, they cannot tackle standard fruit flies or even small crickets. Prey would need to be very small. Liquid carbohydrates like honey water or sugar water would likely be accepted if they follow typical Cardiocondyla patterns, but acceptance is unconfirmed.

Frequently Asked Questions

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References