Polyrhachis hector

Polyrhachis hector

Polyrhachis hector is a medium-sized arboreal ant belonging to the subgenus Myrmhopla, part of the hector species-group. Workers measure around 8.5mm and feature distinctive spur-like spines along the inner edge of the hind tibia, which helps distinguish them from similar species like Polyrhachis abdominalis ^[1]. These ants are found across the Indomalaya region, including Borneo, India, Indonesia, Malaysia, Myanmar, Philippines, Singapore, and the Andaman and Nicobar Islands ^[2][3].

Unlike most ground-nesting ants, P. hector is arboreal, building nests in trees and using silk to bind nest materials together. They construct silk shelters in vegetation, and their pupae are enclosed in cocoons rather than being naked like many other Formicinae ^[4][5]. This silk-nesting behavior makes them somewhat unusual among ants and influences how they should be housed in captivity.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tropical rainforests of Southeast Asia and the Indian subcontinent, from Singapore and Borneo to India and the Philippines. They are arboreal nesters, building silk shelters in vegetation rather than ground nests ^[4][5].
• Colony Type: Likely single-queen (monogyne) colonies based on typical Polyrhachis patterns, though this has not been specifically documented for P. hector.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 10-12mm based on genus patterns
  • Worker: Approximately 8.5mm ^[1]
  • Colony: Likely several hundred workers based on related Polyrhachis species
  • Growth: Moderate, estimated 6-10 weeks from egg to first worker at optimal temperature
  • Development: 6-10 weeks (estimated based on related Polyrhachis species) (Development time is estimated from genus-level data, as species-specific research is lacking. Cocooned pupae suggest slightly longer development than naked-pupae species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. These are tropical ants requiring warm, stable conditions. A heating cable on one side of the nest creates a suitable gradient.
  • Humidity: Maintain 70-80% humidity. Arboreal nesters prefer humid conditions but need good ventilation to prevent mold. Mist the outworld regularly and provide a water source.
  • Diapause: No, as a tropical species, they do not require hibernation. Keep temperatures stable year-round.
  • Nesting: Arboreal silk-nesters. Provide a naturalistic setup with live or artificial plants where they can build silk shelters. Acrylic nests with small chambers can work, but include twigs/branches reaching into the outworld for nest-building material. Y-tong nests with narrow passages scaled to their size are also suitable.
• Behavior: Generally peaceful and non-aggressive compared to many ants. Workers are active foragers that search for nectar, honeydew, and small prey. They are not known to sting and pose no danger to keepers. Their small size (8.5mm workers) means escape prevention should be taken seriously, use tight-fitting lids and fine mesh barriers. They are primarily arboreal, so they will spend more time on plants and branches than on the ground.
• Common Issues: humidity control is critical, too dry causes deshydration and death, escape risk due to small size, use fine mesh and tight barriers, silk-nesting behavior requires branches or plants in the outworld, tropical temperature requirements mean room temperature may be insufficient in winter, wild-caught colonies may have parasites that affect captive survival

Housing and Nest Setup

Polyrhachis hector is an arboreal species that builds silk shelters in vegetation. In captivity, you can provide a naturalistic setup with live or artificial plants where they can construct their silk nests. Alternatively, a Y-tong (acrylic) nest with narrow chambers works well, connected to an outworld that includes branches or vertical structures for foragers. The nest should have chambers scaled to their 8.5mm worker size, not too large or too small. Because they use silk to bind nest materials, adding small pieces of leaf litter or cotton fibers to the outworld can encourage natural building behavior. Keep the nest humid but ensure good ventilation to prevent mold buildup. ^[4][5]

Feeding and Diet

Like most Polyrhachis species, P. hector is omnivorous. They feed on nectar, honeydew from aphids and scale insects, and small insects. In captivity, offer sugar water or honey water as a constant energy source. For protein, provide small insects like fruit flies, small crickets, or mealworms. They are not aggressive predators but will scavenge and forage for protein. Feed them protein 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24 hours to prevent mold.

Temperature and Humidity

These are tropical ants requiring warm and humid conditions. Maintain temperatures between 24-28°C, use a heating cable on one side of the nest if your room temperature falls below this range. Place the heating on top of the nest, not underneath, to avoid evaporating moisture too quickly. Humidity should be kept at 70-80%. Mist the outworld regularly and provide a water tube in the nest area. Good ventilation is essential to prevent stagnant air and mold, but avoid excessive airflow that dries them out. Monitor condensation levels in the nest as a guide, some condensation is good, but standing water should be avoided.

Behavior and Colony Dynamics

Polyrhachis hector workers are active and agile foragers that will explore their territory systematically. They are not particularly aggressive and do not pose a sting threat to keepers. The species is arboreal by nature, so they will tend to stay on branches and vertical surfaces rather than the ground. Colonies grow moderately, expect 6-10 weeks for the first workers to emerge from eggs, then gradual growth over several months to a year. Unlike some Polyrhachis that form large colonies, P. hector likely tops out at a few hundred workers. They are peaceful colony-mates and can be kept alongside other ant species in a shared space if needed, though this is not typically recommended. ^[1]

Seasonal Care

As a tropical species, Polyrhachis hector does not require hibernation or diapause. Keep their conditions stable year-round with temperatures in the 24-28°C range. In winter, when room temperatures drop, you may need to use a small heater or heating cable to maintain warmth. Monitor humidity more carefully in winter, as heated rooms tend to be drier. There is no specific seasonal breeding cycle, queens can lay eggs continuously in warm, stable conditions. Nuptial flights likely occur during the wet season in their native range, but captive breeding is uncommon in the hobby.

Frequently Asked Questions

References