Polyrhachis philippinensis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Philippines ^[1][2]. They inhabit tropical forest environments and nest in rotting wood or under bark.
• Colony Type: Based on typical Polyrhachis patterns, these ants likely form single-queen colonies. Multi-queen colonies are uncommon in this genus.
• Size & Growth:
  • Queen: size data unavailable, inferred from Polyrhachis genus (~13-18 mm)
  • Worker: ~11 mm ^[3]
  • Colony: up to several hundred workers
  • Growth: Moderate
  • Development: Estimated 6-10 weeks at 25-28°C based on genus patterns (Development speed depends on maintaining warm, stable temperatures.)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly 24-28°C. Use a heating cable on one side of the nest to create a gradient.
  • Humidity: Provide a humidity gradient. Keep the nest substrate consistently damp but never waterlogged. These ants prefer tropical conditions.
  • Diapause: No. They are tropical ants and do not require winter cooling.
  • Nesting: Arboreal nesters. Use Y-tong (AAC), plaster, or 3D-printed nests with tight chambers. Avoid open soil setups.
• Behavior: Generally calm. They lack a functional sting and instead spray formic acid from an acidopore when threatened. Escape risk is moderate, use smooth barriers like fluon on test tube rims.
• Common Issues: colonies fail if kept below 22°C for extended periods, workers may abandon the nest if humidity is too dry or too wet, queens can struggle to found colonies without confirmed claustral data, escape attempts increase if nest barriers are not properly maintained

Housing and Nest Setup

Polyrhachis philippinensis nests in trees and rotting wood in the wild ^[2]. In captivity, you should provide tight, enclosed chambers that mimic this environment. Y-tong (AAC), plaster, or 3D-printed nests work best. These materials hold moisture well and give the ants dark, secure spaces to build their brood. Avoid open soil setups, as these ants are not ground-nesters and can struggle in constantly damp or loose substrates. Test tubes work for founding colonies, but you will need to transition them to a proper nest once the colony grows. Keep the nest away from direct sunlight and drafts to maintain stable conditions.

Temperature and Climate Control

These ants require warm, tropical conditions to thrive. Keep the nest area between 24°C and 28°C year-round ^[5]. Most homes run too cool, so you will likely need a heating cable or heat mat on one side of the nest. This creates a gentle temperature gradient that allows workers to move between warmer and cooler areas as needed. Avoid temperatures below 22°C for long periods, as this slows colony development. Use a thermostat controller to prevent overheating. Stable warmth is more important than extreme heat.

Feeding and Diet

Polyrhachis species are omnivorous and will eat a variety of foods. Offer small insects like fruit flies or pinheads for protein. Provide sugar sources such as honey water or sugar water regularly. In the wild, they forage for nectar, honeydew, and small invertebrates. Feed them prey items that match their size. Remove any uneaten insects after 24 to 48 hours to prevent mold. Change sugar water every few days to keep it fresh. Founding queens need tiny prey items and a steady sugar supply to survive their first weeks ^[5].

Frequently Asked Questions

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References