Polyrhachis melpomene

Quick Summary

• Difficulty: Medium
• Origin & Habitat: New Guinea (Papua New Guinea and Indonesian Papua), tropical rainforest environment ^[1]
• Colony Type: Colony structure is unconfirmed. Research does not specify queen number.
• Size & Growth:
  • Queen: Approximately 10-12 mm, inferred from Polyrhachis genus patterns.
  • Worker: Approximately 6-9 mm, inferred from Polyrhachis genus patterns.
  • Colony: Up to several hundred workers, inferred from genus patterns.
  • Growth: Moderate, inferred from typical Polyrhachis development.
  • Development: Estimated 6-8 weeks at tropical temperatures, inferred from related Polyrhachis species. (Cocoons are present, which is typical for the genus ^[2].)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This tropical species does not tolerate cool temperatures well.
  • Humidity: Maintain moderate to high humidity. Keep the nest substrate moist but not waterlogged.
  • Diapause: No, as a tropical species, they do not require hibernation.
  • Nesting: Lignicolous in nature. In captivity, use wood-based nests like Y-tong or plaster with wood inclusions ^[2][3].
• Behavior: Polyrhachis ants are generally calm and will defend their nest if disturbed. Workers have spines for defense. As Formicinae, they use formic acid spray rather than stinging. Escape prevention is important due to their climbing ability.
• Common Issues: temperatures below 22°C can cause decline, keep them warm, wood-nesting species need appropriate nest material, test tubes may not be ideal long-term, limited availability makes this species difficult to acquire, high humidity requirements can lead to mold if ventilation is poor, wild-caught colonies may have parasites or diseases

Nest Preferences and Housing

Polyrhachis melpomene is a lignicolous species, meaning it naturally nests in rotting wood ^[2][3]. In captivity, provide nest conditions that mimic this. Y-tong (AAC) nests work well, or create a naturalistic setup with pieces of rotting wood embedded in soil or plaster. The wood should be soft enough for excavation but firm enough to hold tunnels. Some keepers use plaster nests with wood cavities. Test tubes can work for founding colonies, but transfer to a wood-based nest as the colony grows. Ensure humidity retention since wood-nesting ants prefer slightly moist conditions.

Feeding and Diet

Diet is not specified in research for this species. Based on general Polyrhachis habits, they are likely omnivores. Offer sugar water or honey constantly for energy, and provide small insects like fruit flies or mealworms for protein. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Care

As a tropical species, P. melpomene requires warm conditions. Keep the nest area at 24-28°C, with a slight gradient if possible. Avoid temperatures below 22°C. Use heating cables or mats if needed, but monitor for overheating. Since they do not undergo diapause, maintain consistent temperatures year-round.

Humidity and Water

New Guinea has a humid climate, so maintain moderate to high humidity. Keep the nest substrate moist but not waterlogged. Provide a water source like a cotton wick. Balance humidity with ventilation to prevent mold growth.

Behavior and Temperament

Polyrhachis ants are generally calm. Workers forage methodically and defend the nest if disturbed. Spines serve as passive defense. As Formicinae, they use formic acid spray rather than stinging. They are good climbers, so escape prevention is important. Use barriers like Fluon on outworld rims.

Frequently Asked Questions

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References