Polyrhachis sculpturata

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Warm broadleaved forests and built-up areas across the Indomalaya region (Borneo, India, Indonesia, Malaysia, Philippines, Sulawesi) at elevations of 700 to 1400 meters ^[5][3][4][2].
• Colony Type: Colony structure is unconfirmed. Based on typical Polyrhachis (Myrma) patterns, they likely form single-queen colonies.
• Size & Growth:
  • Queen: size data unavailable, inferred from Polyrhachis genus (~10-14mm)
  • Worker: size data unavailable, inferred from Polyrhachis genus (~6-10mm)
  • Colony: Up to a few thousand workers (estimated)
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at stable tropical temperatures, actual timing is unconfirmed. (Development speed depends on consistent warmth and steady food supply.)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly low-to-mid 20s°C to high 20s°C. Tropical species need consistent heat. Use a heating cable on one side of the nest if your room runs cooler.
  • Humidity: Keep the nest substrate consistently moist but not waterlogged. Provide a small moist area in the nest while keeping the rest drier.
  • Diapause: No. As a tropical species, they do not need winter dormancy. Activity may slow slightly during cooler months, but you should keep them above 20°C year-round.
  • Nesting: They nest in rotting wood, under bark, and in soil cavities ^[2]. In captivity, a Y-tong (AAC) nest, plaster nest, or 3D-printed nest works best. Provide damp substrate like soil or coco fiber.
• Behavior: Generally calm and non-aggressive. Workers forage actively but do not show extreme defensiveness. Escape risk is low to moderate. Use standard escape prevention like Fluon on container edges. They accept a wide range of foods and locate prey quickly.
• Common Issues: temperature drops below 20°C can stress or kill the colony, poor ventilation causes mold in humid nests, wild-caught colonies may carry parasites that cause failure, sugar alone is insufficient, they need regular protein, founders may fail if disturbed during the initial brood stage

Housing and Nest Setup

They nest in rotting wood, under bark, and in soil cavities ^[2]. You can house them in a Y-tong (AAC) nest, a plaster nest, or a 3D-printed nest. Provide chambers that give them room to move without crushing their thoracic spines. A naturalistic setup with rotting wood pieces, leaf litter, and damp soil mimics their forest floor habitat. Keep the substrate damp but not soggy. A water tube in the outworld provides drinking water. Start with a test tube setup for founding colonies. Move them to a larger formicarium once the colony reaches a manageable size.

Feeding and Diet

They are omnivorous and accept a varied diet. Offer sugar water or honey regularly for energy. Provide small insects like fruit flies, small crickets, or mealworms for protein. They hunt live prey actively in the outworld. Feed protein two to three times per week. Keep sugar water available at all times. Remove uneaten prey after 24 to 48 hours to prevent mold. They occasionally accept fresh fruit but do not require it.

Temperature and Humidity Control

This species comes from Southeast Asia and needs warm, humid conditions. Keep temperatures between 24 and 28°C year-round. A slight temperature gradient in the nest lets workers choose their preferred zone. Use a heating cable or mat on one side if your room runs cooler. Maintain high humidity by keeping the nest substrate consistently damp. Provide a humidity gradient with one small moist area and drier zones. Good ventilation prevents mold while keeping moisture levels stable.

Colony Founding and Early Development

Founding behavior is unconfirmed. Keep the queen undisturbed until workers emerge. The first workers (nanitics) will begin foraging to feed the developing brood. The colony grows gradually at first. Do not expect rapid expansion. Keep founding colonies in dark, quiet locations. Feed the first workers small amounts of sugar water and tiny prey items.

Behavior and Temperament

Workers are active and alert but not particularly aggressive. They investigate the outworld for food and defend the nest if threatened. They do not exhibit extreme defensiveness. Workers communicate using chemical trails and recruit nestmates to food sources efficiently. They are good climbers and may explore vertical surfaces. The thoracic spines give them a distinctive look and likely deter predators. Overall, they are a manageable species for keepers who maintain tropical conditions consistently.

Frequently Asked Questions

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References