Polyrhachis maculata

Polyrhachis maculata

Polyrhachis maculata is a tropical ant species belonging to the subgenus Campomyrma. Workers are medium-sized at 6-8mm, characterized by their dark coloration with distinctive lighter markings and the spiny projections on the thorax that give the genus its common name 'spiny ants'. These ants are native to the tropical regions of Southeast Asia and northern Australia, where they nest in rotting wood in forested areas. Unlike some Polyrhachis species that weave nests from leaves, this species is lignicolous, meaning it nests in wood ^[1]. They have cocooned pupae, which is typical for the genus ^[2].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tropical Southeast Asia and northern Australia, found in forested areas where they nest in rotting wood ^[1][2].
• Colony Type: Colony structure is not well-documented in scientific literature. Based on typical Polyrhachis patterns, they likely form colonies with a single queen (monogyne), though some related species can have multiple queens.
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 10-12mm based on genus patterns, not directly measured for this species
  • Worker: 6-8mm ^[3]
  • Colony: Likely several hundred workers based on related species, unconfirmed
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at tropical temperatures (25-28°C) based on genus patterns (Development time is inferred from related Polyrhachis species, direct measurements for P. maculata are not available)
• Antkeeping:
  • Temperature: Keep at 24-28°C. They are tropical ants that need consistent warmth. A heating cable on one side of the nest can create a suitable gradient.
  • Humidity: Require high humidity (70-80%) due to their tropical forest habitat and wood-nesting behavior. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: No, being tropical, they do not require hibernation. Maintain warm temperatures year-round.
  • Nesting: Lignicolous (wood-nesting) species. In captivity, they do well in Y-tong (AAC) nests, plaster nests, or naturalistic setups with rotting wood/corso bark. They prefer enclosed dark spaces that mimic their natural wood cavities.
• Behavior: Generally calm and non-aggressive foragers. Workers are active and will search for food both on the ground and can climb well. They are omnivorous, accepting both protein sources and sugar water. Escape prevention should be moderate, they are not tiny ants but can climb smooth surfaces. They are primarily nocturnal or crepuscular in activity patterns.
• Common Issues: tropical humidity requirements mean mold can be a problem if ventilation is poor, wood-nesting means they need appropriate nest materials that hold moisture without rotting quickly, temperatures below 22°C can slow activity and may stress colonies, wild-caught colonies may carry parasites that are difficult to treat in captivity, cocooned pupae take longer to develop than naked pupae, don't assume eggs are dead if development seems slow

Housing and Nest Setup

Polyrhachis maculata is a lignicolous species, meaning it naturally nests in rotting wood. In captivity, Y-tong (AAC) nests work well because they provide the dark, enclosed spaces these ants prefer. Plaster nests are also suitable as they can hold moisture well. For a naturalistic setup, you can use corso bark or pieces of rotting wood placed in an outworld. The key is providing chambers that are enclosed and dark, these ants do not like exposed, open spaces. Make sure the nest material can hold some moisture without quickly rotting. A water reservoir connected to the nest helps maintain humidity over time. ^[1][2]

Feeding and Diet

Like most Polyrhachis species, P. maculata is omnivorous. Offer a varied diet including protein sources like small insects (fruit flies, small crickets, mealworms) and sugar sources (honey water, sugar water, or pure honey). They will also eat small amounts of seeds or fruit. Feed protein 2-3 times per week, and keep a sugar source available at all times. Remove uneaten prey after 24-48 hours to prevent mold. Workers are active foragers and will readily search for food in the outworld.

Temperature and Humidity

These are tropical ants that need warm, humid conditions. Keep the nest area at 24-28°C consistently. Temperatures below 22°C can cause the colony to become sluggish and may lead to health problems. Use a heating cable on one side of the nest to create a gentle temperature gradient if your room temperature is below 24°C. Humidity should be kept at 70-80%. The nest substrate should feel consistently moist but never waterlogged. Mist the nest area occasionally and use a water reservoir to maintain long-term humidity. Good ventilation is important to prevent mold while maintaining humidity.

Colony Development

Polyrhachis maculata has cocooned pupae, which means development takes longer than species with naked pupae. Expect the egg to worker timeline to be around 6-8 weeks at optimal temperatures (25-28°C). The first workers (nanitics) will be smaller than mature workers. Growth rate is moderate, the colony will expand gradually over several months. Once the colony reaches 20-30 workers, growth typically accelerates. Be patient with founding colonies, they can take several months to establish firmly. Do not disturb the queen during the founding phase as she needs to seal herself in and focus on raising the first brood. ^[2]

Behavior and Temperament

Polyrhachis maculata workers are generally calm and not overly aggressive. They are good climbers and will explore their outworld actively, especially at night. Unlike some arboreal Polyrhachis species that weave leaf nests, this species is more ground-oriented due to its wood-nesting habit. Workers communicate through chemical trails and will efficiently recruit nestmates to food sources. They are not particularly defensive and rarely sting, making them suitable for observation. However, they can escape through small gaps due to their climbing ability, ensure your setup has tight-fitting lids and consider using fluon on rim edges.

Frequently Asked Questions

References