Polyrhachis ruficornis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tropical rainforests of Borneo, Sarawak ^[1][2]. They nest in rotting wood, under bark, and in vegetation in humid forest environments ^[3].
• Colony Type: Colony structure is unconfirmed. Based on genus patterns, likely monogyne (single queen), but no species-specific data exists.
• Size & Growth:
  • Queen: Approximately 8-9mm ^[2].
  • Worker: Size data unavailable, no total length measurements for workers in context. Inferred from Polyrhachis genus to be smaller than queens.
  • Colony: Maximum colony size unknown, estimated from genus patterns to be up to several hundred workers.
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at tropical temperatures, based on genus patterns. (Development time is inferred from related Polyrhachis species, as no species-specific data is available.)
• Antkeeping:
  • Temperature: Keep warm, around 24-28°C, as inferred from tropical habitat.
  • Humidity: High humidity needed, keep nest substrate consistently moist but not waterlogged, based on tropical habitat.
  • Diapause: No, as a tropical species from Borneo, they do not require hibernation.
  • Nesting: Prefers arboreal nesting in wood or bark-like materials. Use Y-tong, plaster nests with wood, or naturalistic setups ^[3].
• Behavior: Generally peaceful and not aggressive toward keepers. Workers are active foragers that explore both ground and vegetation. Defense involves formic acid spray, as typical for Formicinae ants. Escape risk is moderate due to climbing ability, ensure tight seals on setups.
• Common Issues: mold can develop if humidity is too high and ventilation is poor, balance is key, temperatures below 20°C can be lethal for this tropical species, arboreal nesting preference may require specific setup adjustments, escape risk due to climbing ability, ensure no gaps in the outworld or nest

Housing and Nest Setup

Polyrhachis ruficornis does best in setups that mimic their natural arboreal nesting preferences. Use Y-tong (AAC) nests with wood sections or cork backing, or plaster nests with added wood pieces ^[3]. Provide a proper outworld with climbing surfaces and vegetation. Test tubes can work for founding colonies but move them to a proper nest within a few months as the colony grows. Ensure good escape prevention, these ants are agile climbers ^[3].

Feeding and Diet

These ants are omnivorous, as typical for Polyrhachis genus. Offer sugar sources like honey or sugar water constantly, and protein such as small insects 2-3 times per week. In founding colonies, the queen relies on stored fat reserves. Once workers arrive, feed them small prey items and remove uneaten food after 24-48 hours to prevent mold.

Temperature and Humidity Management

Maintain temperatures between 24-28°C year-round, as inferred from tropical habitat. Humidity should be high, keep nest substrate damp but not waterlogged. A water reservoir can help maintain humidity. Avoid temperatures below 20°C, as this can stress or kill the colony. No hibernation is needed.

Colony Development and Growth

A newly mated queen may seal herself in a chamber and lay eggs. First workers typically emerge after 6-8 weeks at optimal temperatures, based on genus patterns. Colony growth is moderate, with acceleration after the first workers establish. Patience is key, as growth rates vary.

Behavior and Temperament

Polyrhachis ruficornis is peaceful and rarely aggressive toward keepers. Workers are active foragers and explore regularly. Their primary defense is formic acid spray, as typical for Formicinae ants. They are day-active and establish foraging patterns once established.

Frequently Asked Questions

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References