Polyrhachis labella

Polyrhachis labella

Polyrhachis labella is a spiny ant species from the Maluku Islands of Indonesia and the Solomon Islands. Workers are approximately 6-7mm with a distinctive black coloration and fine silky grayish pubescence covering the head and thorax. The thorax is flattened and longitudinally striated, with the lateral margins raised into sharp spines. The petiole (node) features two long, stout, erect spines. The tibiae and tarsal claws are reddish-brown. This is a tropical species that likely nests in vegetation or rotting wood in humid forest environments.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the Maluku Islands (Bacan/Batjan) in Indonesia and the Solomon Islands (Guadalcanal, Bellona). Found in tropical forest habitats ^[1][2].
• Colony Type: Colony structure is unconfirmed. Most Polyrhachis species are monogyne (single queen), but this has not been directly documented for P. labella.
• Size & Growth:
  • Queen: Undocumented, estimated 8-10mm based on genus patterns
  • Worker: Approximately 6-7mm (3 lines) ^[1]
  • Colony: Unknown for this species, Polyrhachis colonies typically reach several hundred workers
  • Growth: Moderate, inferred from tropical Formicinae patterns
  • Development: Estimated 6-8 weeks at optimal tropical temperatures (25-28°C) (Development time is inferred from related Polyrhachis and Camponotus species. Warm temperatures will accelerate development.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. These are tropical ants that need warmth. Use a heating cable on one side of the nest to create a gradient if room temperature is below 24°C.
  • Humidity: High humidity (70-85%). Keep the nest substrate consistently moist but not waterlogged. Mist occasionally and provide a water tube for drinking.
  • Diapause: No, this is a tropical species that does not require hibernation. Maintain warm temperatures year-round.
  • Nesting: Polyrhachis ants are often semi-arboreal. They prefer nests in rotting wood, under bark, or in hollow twigs. In captivity, a Y-tong (AAC) nest or plaster nest with some moisture retention works well. Provide a small piece of rotting wood or cork bark if using a naturalistic setup.
• Behavior: Polyrhachis ants are generally peaceful and not aggressive. Workers are active foragers that search for honeydew and small prey. They have a moderate escape risk due to their size, ensure enclosures have tight-fitting lids. They are not known to sting and pose no danger to keepers.
• Common Issues: tropical species may struggle in cool, dry environments, maintain heat and humidity, colonies can stall if temperatures drop below 24°C for extended periods, wild-caught colonies may carry parasites, quarantine and monitor new colonies, small colony sizes initially may be fragile, avoid disturbing founding queens

Housing and Nest Setup

Polyrhachis labella does well in a Y-tong (acrylic) nest or a moist plaster nest. These ants prefer some humidity retention in their nest environment. Since they are likely semi-arboreal in nature, you can include small pieces of cork bark or rotting wood in a naturalistic setup. A test tube setup can work for founding colonies, but transfer to a proper nest once the colony reaches 20-30 workers. Ensure the outworld has space for foraging and place a water tube for drinking.

Feeding and Diet

Like most Polyrhachis species, P. labella likely feeds on honeydew from aphids and scale insects, plus small insects and arthropods. In captivity, offer a constant source of sugar water or honey diluted with water. Feed small insects like fruit flies, pinhead crickets, or mealworms twice weekly. Remove uneaten prey after 24 hours to prevent mold. This species is not specialized and should accept standard ant foods.

Temperature and Heating

As a tropical species from Indonesia and the Solomon Islands, P. labella requires warm conditions. Keep the nest area at 24-28°C consistently. A heating cable placed on top of the nest (never underneath to avoid drying) can create a gentle warmth gradient. Room temperature alone may be insufficient if your home is below 24°C. Monitor colony activity, if workers cluster near the heat source, increase temperature slightly. Avoid temperature fluctuations.

Humidity and Moisture

Tropical forest ants need high humidity. Keep the nest substrate consistently moist but never waterlogged. The substrate should feel damp to the touch. Provide a water tube in the outworld so workers can drink. Mist the outworld occasionally, especially if you notice workers gathering at water droplets. Good ventilation helps prevent mold while maintaining humidity.

Colony Development and Growth

A newly mated queen will seal herself in a chamber and lay eggs after the claustral founding period. First workers (nanitics) will be smaller than mature workers. The colony will grow slowly at first, then accelerate once the first workers begin foraging. Expect 6-8 weeks to first workers at optimal temperatures. Colony growth is moderate, patience is key during the founding phase. Do not disturb the queen during founding as this can cause her to eat her brood.

Frequently Asked Questions

References