Plectroctena subterranea

Plectroctena subterranea - "Underground Millipede Muncher ant"

Plectroctena subterranea is a medium-sized predatory ant species native to central and eastern Africa. Workers measure approximately 8-12mm with distinctive powerful mandibles capable of rapid snapping movements, characteristic of trap-jaw ants in the Ponerinae subfamily. The species has a dark reddish-brown to black coloration. This ant was first recorded in Rwanda's Akagera National Park in 2026,expanding the known range of this rarely studied species ^[1]. In the wild, they typically nest in rotting wood or under stones in forested areas, where they hunt small invertebrates.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Central to eastern Africa, primarily in forested habitats. Collected in Akagera National Park, Rwanda, which features savanna and woodland ecosystems ^[1].
• Colony Type: Colony structure is unconfirmed. Based on typical Plectroctena patterns, likely single-queen colonies with moderate worker populations.
• Size & Growth:
  • Queen: Estimated 12-15mm based on genus Plectroctena morphology
  • Worker: Estimated 8-12mm based on genus patterns
  • Colony: Estimated several hundred workers based on related Ponerinae species
  • Growth: Moderate
  • Development: Estimated 8-12 weeks at optimal temperature based on typical Ponerinae development (Development time is estimated from related species, specific data for P. subterranea is unavailable)
• Antkeeping:
  • Temperature: Keep at 24-28°C. A heating cable on one side of the nest creates a temperature gradient allowing ants to self-regulate.
  • Humidity: Maintain moderate to high humidity (60-80%). Keep the nest substrate consistently moist but not waterlogged. Mist occasionally and provide a water tube.
  • Diapause: Unlikely required. As a tropical African species, they probably do not enter true diapause. However, slight temperature reduction during winter months may slow activity.
  • Nesting: In captivity, they do well in Y-tong (AAC) nests or naturalistic setups with rotting wood sections. They prefer dark, humid nest chambers. Avoid dry conditions.
• Behavior: Plectroctena subterranea is a predatory ant with powerful trap-jaw mandibles. They are active hunters and will readily tackle small live prey. Workers are moderately aggressive and will defend the colony. They are primarily nocturnal or crepuscular foragers. Escape prevention is important due to their medium size, ensure nest connections are secure. They may be less aggressive than some Ponerines but will sting if threatened.
• Common Issues: predatory diet means colonies can starve without regular live prey, this is the most common failure point, tropical species may decline if kept too cool, maintain warm temperatures year-round, escape prevention matters despite their medium size, they can squeeze through small gaps, wild-caught colonies may carry parasites that cause colony collapse in captivity, slow founding means new keepers often give up before first workers arrive

Housing and Nest Setup

Plectroctena subterranea does well in Y-tong (acrylic) nests or naturalistic setups. They prefer dark, humid chambers that mimic their natural underground nesting sites. A nest with chambers sized 10-15mm tall works well for their medium size. Provide a water tube for humidity and mist the outworld occasionally. Since they are predatory, include an outworld area where you can place live prey. Test tube setups work for founding colonies but will need upgrading as the colony grows. Avoid dry nests, these ants are adapted to humid forest floor conditions.

Feeding and Diet

As a predatory ant species, Plectroctena subterranea requires live protein prey as their primary food source. Offer small insects such as fruit flies, small crickets, mealworms, and other appropriately sized arthropods. They will likely accept soft-bodied prey more readily. Feed protein 2-3 times per week, adjusting based on colony size and consumption. Sugar sources may be accepted occasionally, you can offer a drop of honey or sugar water, but do not rely on these as primary nutrition. Fresh water should always be available.

Temperature and Seasonal Care

Maintain temperatures between 24-28°C for optimal colony health and development. A heating cable placed on one end of the nest creates a gradient that allows ants to regulate their own temperature. As a tropical African species, they do not require true hibernation. During winter months, you can slightly reduce temperatures (to around 20-22°C) which may slow activity, but avoid cold temperatures below 18°C. Keep them warm year-round and avoid drafts from windows or air conditioning.

Behavior and Handling

These ants possess powerful trap-jaw mandibles capable of rapid snapping. While they are not typically aggressive toward keepers, they will defend their nest if threatened. Workers are active hunters and will pursue prey across the outworld. They are primarily crepuscular or nocturnal, so expect most activity during evening and night hours. When cleaning the outworld or performing maintenance, use caution and work gently to avoid provoking defensive behavior. Their sting is not considered dangerous to healthy humans but can cause brief discomfort.

Frequently Asked Questions

References