Polyrhachis nigripes

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to New Guinea (Gulf of Papua coast) and northern Queensland, Australia, in monsoon rainforest environments ^[1][2].
• Colony Type: Colony structure is unconfirmed. The single observed wild colony had one queen with 19 workers ^[1]. Based on typical Polyrhachis patterns, colonies are likely single-queen.
• Size & Growth:
  • Queen: ~8.52 mm ^[1]
  • Worker: ~5.74-6.25 mm ^[1]
  • Colony: Up to 19 workers observed in the wild ^[1]. Colonies likely grow larger based on related species.
  • Growth: Moderate, inferred from similar Polyrhachis species
  • Development: Estimated 6-10 weeks at optimal temperature, based on related species (Development time is not directly documented. Cocoons are present ^[3].)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly 24-28°C, based on tropical rainforest origin. Use a heating gradient if needed.
  • Humidity: Keep nest substrate consistently moist but not waterlogged, as they are from humid environments.
  • Diapause: No, as a tropical species from near-equatorial regions.
  • Nesting: Arboreal nester that uses silk and vegetation debris ^[3]. Provide naturalistic setups with plant material or Y-tong nests with silk materials.
• Behavior: Workers are generally calm and non-aggressive. As Formicinae, they lack a stinger but can spray formic acid for defense. Escape risk is moderate due to their medium size, standard barriers like Fluon work well.
• Common Issues: high humidity can lead to mold if ventilation is poor, arboreal nesting needs may be challenging to replicate, slow colony growth may frustrate beginners, wild-caught colonies may have parasites or diseases, silk nest construction requires appropriate materials

Nest Preferences and Housing

Polyrhachis nigripes is an arboreal species that builds nests using silk and vegetation debris ^[3]. In the wild, they nest in trees or on fallen branches ^[1]. For captivity, provide a naturalistic setup with twigs, leaves, or artificial plants for silk construction. Alternatively, use a Y-tong nest with narrow chambers and include silk materials. Keep the nest humid but ensure ventilation to prevent mold.

Feeding and Diet

These ants are omnivorous. Offer sugar sources like honey water constantly and protein such as small insects twice weekly. Feed in the outworld and remove uneaten prey after 24-48 hours to avoid mold.

Temperature and Seasonal Care

As a tropical species, keep temperatures around 24-28°C with minimal fluctuations. A heating cable on one side of the nest creates a gradient. No hibernation is needed, but activity may reduce in cooler periods.

Behavior and Defense

Workers are calm and moderately active. They lack a stinger but can spray formic acid from an acidopore for defense, which may irritate skin. Escape risk is moderate, use Fluon barriers for containers.

Colony Founding

Founding behavior is unconfirmed. Based on typical Polyrhachis patterns, queens may seal themselves in a chamber and raise the first brood alone, but this is not documented for this species.

Frequently Asked Questions

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References