Polyrhachis armata

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southeast Asian tropical rainforests, from India through the Philippines, Borneo, Sumatra, Java, Thailand, Vietnam, Malaysia, Singapore, Laos, Cambodia, and southern China. Found primarily in primary lowland dipterocarp forests and canopy environments ^[1][7].
• Colony Type: Colony structure is unconfirmed. Based on genus patterns, likely single-queen colonies.
• Size & Growth:
  • Queen: Size data unavailable
  • Worker: Approximately 9-11 mm ^[4][5]
  • Colony: Up to 500 workers (estimated)
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at optimal temperatures ^[9] (Development time is not directly documented, estimates based on typical Polyrhachis patterns.)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly 24-28°C, based on tropical rainforest habitat ^[9].
  • Humidity: Keep nest substrate consistently moist but not waterlogged, with some drier areas available, as they are from humid environments ^[9].
  • Diapause: No, as a tropical species, they do not require hibernation ^[9].
  • Nesting: Arboreal ants that naturally nest in trees using silk. In captivity, provide naturalistic setups with plants or Y-tong nests with climbing structures ^[6].
• Behavior: Workers are generally calm but will defend themselves by secreting bubble acid foam when threatened ^[8]. They are good climbers and may attempt to escape if housing is not secure. Escape prevention should be moderate due to their size and climbing ability.
• Common Issues: primary forest specialist may struggle in suboptimal captive environments., arboreal nature requires vertical space and climbing structures., defensive foam secretion can be startling but is harmless to humans., sensitive to temperature drops, keep consistently warm., may be difficult to establish if wild-caught from degraded habitats.

Housing and Nest Setup

Polyrhachis armata is an arboreal species, so provide a setup with vertical space for climbing. Use naturalistic arrangements with live plants, branches, or leaves that they can bind with silk ^[6]. Alternatively, a Y-tong nest with multiple chambers works well. Add materials like cotton or fabric for silk binding. Ensure the setup is secure to prevent escapes.

Feeding and Diet

These ants are omnivorous. Offer sugar water or honey constantly for energy, and provide protein sources like small insects 2-3 times per week ^[9]. Remove uneaten food after 24-48 hours to prevent mold.

Temperature and Humidity

Keep temperatures between 24-28°C consistently, as they are from tropical rainforests ^[9]. Maintain humidity by keeping the nest substrate moist but not waterlogged, with some drier areas available ^[9].

Behavior and Defense

Workers secrete a bubble acid foam from the abdomen when threatened, which is a unique defensive trait ^[8]. They are not aggressive but will defend their nest. Use standard escape prevention measures due to their climbing ability.

Colony Development

Colony growth is moderate. First workers may emerge in about 6-8 weeks at optimal temperatures, based on typical Polyrhachis patterns ^[9]. Provide adequate space as the colony expands.

Ecological Notes

Polyrhachis armata is a primary forest specialist, found almost exclusively in intact rainforest and absent from disturbed areas ^[7]. It can be host to the fungus Ophiocordyceps unilateralis in Asia ^[10][11]. This specialization means captive colonies may be sensitive to environmental conditions.

Frequently Asked Questions

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References