Polyrhachis thrinax

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to South and Southeast Asia, including Sri Lanka, India, Bangladesh, Philippines, Thailand, and Yunnan province in southern China. Found in tropical and subtropical forests where it nests arboreally in trees and shrubs ^[1][2][3].
• Colony Type: Colony structure is unconfirmed from available literature. Based on typical Polyrhachis patterns, likely single-queen colonies, but no specific data exists.
• Size & Growth:
  • Queen: Size data unavailable, no total length measurements in literature
  • Worker: Size data unavailable, no total length measurements in literature
  • Colony: Up to 100 workers based on descriptions of 'very small communities' ^[4]
  • Growth: Estimated moderate growth rate based on typical Formicinae patterns
  • Development: Development time is unknown, estimated 6-8 weeks based on related species (Specific development data for this species is not available in the literature)
• Antkeeping:
  • Temperature: Keep warm, roughly 24-28°C, based on tropical habitat. A gentle gradient allows workers to self-regulate ^[1][2]
  • Humidity: Keep nest substrate consistently moist but not waterlogged, based on forest habitat ^[4]
  • Diapause: No diapause required, as species is tropical ^[1][2]
  • Nesting: Arboreal nesting, provide vertical setups with branches and leaves. Use Y-tong, plaster, or 3D-printed nests. Avoid soil-based nests ^[6][5]
• Behavior: Workers spray formic acid for defense, as typical for Formicinae. They are generally calm and non-aggressive. Escape risk is moderate due to small size, ensure tight-fitting lids and check connections. Silk-weaving behavior may be observed if materials are provided ^[4][5]
• Common Issues: small colony size means colonies are sensitive to disturbance and stress, arboreal nature requires vertical space, horizontal-only setups may cause stress, high humidity needs can lead to mold if ventilation is poor, escape prevention is important, check all connections for gaps, wild-caught colonies may have parasites that can devastate captive colonies

Housing and Nest Setup

Polyrhachis thrinax is an arboreal species that requires vertical space. In the wild, they nest in trees by weaving leaves together with silk from their larvae ^[4][5]. In captivity, provide climbing structures like branches or fake leaves. Use Y-tong, plaster, or 3D-printed nests, avoid acrylic nests. The outworld should be tall for vertical exploration. You may observe silk-weaving if you provide materials like cotton or small fabric pieces ^[6][5].

Feeding and Diet

Feed sugar water, honey, or diluted maple syrup continuously for carbohydrates. Offer protein sources like fruit flies, small crickets, or mealworms 2-3 times per week. Remove uneaten prey after 24-48 hours to prevent mold. Fresh water should always be available ^[7].

Temperature and Humidity

Keep the nest area warm, roughly 24-28°C, with a slight gradient for self-regulation. Humidity is critical: keep the nest substrate consistently moist but not waterlogged. Use a water reservoir and mist regularly, but ensure good ventilation to prevent mold ^[1][2][4].

Colony Dynamics and Growth

Colonies remain small, with up to 100 workers in mature colonies ^[4]. This means colonies are sensitive to disturbance, avoid frequent nest checks. Growth is steady rather than explosive, so set expectations accordingly.

Unique Behaviors

The silk-weaving behavior is a key trait: workers use larvae to bind leaves into nests ^[5]. You may observe this in captivity if materials are provided. Spines on the thorax are for defense against predators.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References