Polyrhachis nigropilosa

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tropical rainforests of Borneo, Peninsular Malaysia, Sulawesi, and the Philippines ^[1][2][3]. They are ground-dwelling ants that nest in rotting wood and terrestrial locations ^[5][6].
• Colony Type: Single-queen colonies (monogyne) that maintain multiple nests within their territory (polydomous) ^[5][6]. This means your colony may expand into additional nesting sites as it grows.
• Size & Growth:
  • Queen: size data unavailable
  • Worker: size data unavailable
  • Colony: Colonies can reach several hundred workers
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at optimal tropical temperatures (Development is likely similar to other tropical ant species, warm temperatures accelerate development)
• Antkeeping:
  • Temperature: Keep warm, roughly 24-28°C, based on their tropical habitat ^[5]. Provide a gentle gradient if possible.
  • Humidity: Keep the nest substrate consistently moist but not waterlogged, as they come from humid rainforests ^[5][6].
  • Diapause: No, as a tropical species, they do not require hibernation ^[5].
  • Nesting: Provide Y-tong, plaster, or soil nests with moisture retention. They prefer wood-based substrates and multiple chambers for polydomous behavior ^[5][6].
• Behavior: Workers are active foragers that use group recruitment to find food ^[7]. They are nocturnal on tree trunks ^[8]. They are not aggressive and lack a functional stinger, making them safe to handle. Escape risk is moderate due to their climbing ability.
• Common Issues: high humidity requirements can lead to mold if ventilation is poor., temperatures below 20°C can stress the colony., polydomous colonies may expand into multiple areas, requiring space., wild-caught colonies may carry parasites., foraging workers may escape if connections are not secure.

Nest Preferences and Housing

Polyrhachis nigropilosa naturally nests in rotting wood and terrestrial locations in humid forest environments ^[5][6]. For captive care, use a Y-tong, plaster, or soil nest with good moisture retention. The nest should have multiple chambers connected by tunnels to accommodate their polydomous behavior ^[5][6]. Keep the nest substrate consistently moist but not waterlogged. Since they are moderate climbers, ensure all connections are secure to prevent escapes.

Feeding and Diet

In the wild, these ants collect sugary sap from plants and dead insects ^[7]. For captive colonies, offer a varied diet including sugar water or honey as a constant energy source, and protein-rich foods like mealworms or crickets 2-3 times per week. They are opportunistic scavengers and will accept most protein sources. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Seasonal Care

As a tropical species, Polyrhachis nigropilosa requires warm temperatures year-round. Maintain nest temperatures around 24-28°C for optimal brood development ^[5]. Room temperature may be sufficient if your home stays in this range, otherwise use a heating cable to create a gentle gradient. They do not require hibernation, keep them warm year-round. Avoid temperatures below 20°C as this can stress the colony.

Colony Structure and Growth

This species forms single-queen colonies (monogyne) but maintains multiple nests within their territory, this is called polydomous nesting ^[5][6]. In captivity, this means your colony may naturally want to expand into additional spaces as it grows. A queen can live for many years, and colonies can eventually reach several hundred workers. Growth is moderate, expect several months to a year before seeing significant worker numbers from a newly founded colony.

Behavior and Foraging

Workers forage both during the day and at night, with field observations showing particular activity on tree trunks after dark ^[8]. They use group recruitment to organize foraging efforts, when a worker finds food, she returns to the nest and leads other workers to the source ^[7]. They are not aggressive toward keepers and lack a painful sting, though they may bite if provoked. Their moderate size and active foraging make them engaging pets.

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