Probolomyrmex brevirostris

Quick Summary

• Difficulty: Expert
• Origin & Habitat: East Africa: recorded from Eritrea, Ethiopia, Uganda, and Yemen ^[1]. Collected near termites in Eritrea and among humus and leaves at the base of a tree in a banana plantation in Uganda ^[2].
• Colony Type: Unknown – no colony structure data exist.
• Size & Growth:
  • Queen: size data unavailable
  • Worker: size data unavailable
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown – not documented (No data from scientific literature.)
• Antkeeping:
  • Temperature: Warm,24–28°C – estimated from tropical distribution ^[2]. Use a gentle temperature gradient.
  • Humidity: High – keep substrate consistently moist. Based on collection notes from humid leaf litter and termite habitats ^[2].
  • Diapause: Unknown – likely no true diapause given tropical range, but may slow down during cooler months ^[2].
  • Nesting: Use a test tube setup or a small plaster/Ytong nest with very tight chambers. In nature found near termites and in leaf litter ^[2]. Avoid acrylic nests.
• Behavior: Nothing documented for this species. Based on Proceratiinae subfamily, they are secretive, slow-moving predators with functional stingers. Their tiny size demands extreme escape prevention – use fine mesh and tight seals.
• Common Issues: species is almost never available in the hobby – virtually no captive experience exists, no established care protocols – keepers must experiment with caution, escape prevention is critical due to their tiny size – they can squeeze through minute gaps, colony dynamics are unknown, making them vulnerable to stress from unknown causes, high humidity requirements can cause mold if ventilation is inadequate

Why This Species Is So Challenging

Probolomyrmex brevirostris is among the most difficult ants to keep because virtually nothing is known about its life in the wild or in captivity. Only a handful of specimens have ever been collected since its original description in 1910 ^[1]. This is not a species you will find for sale – it remains one of the rarest ants in the world. Even if you somehow acquire a queen, no care protocols exist. Before attempting this species, you should have extensive experience with other Proceratiinae ants like Proceratium or Discothyrea. Even then, success is far from guaranteed ^[2].

Housing and Nest Setup

Because the ants are so tiny (size data unavailable) ^[2], housing must be carefully designed. Use a test tube setup with a very small water reservoir, or a small plaster or Ytong nest with chambers scaled to fit a very small colony. The nest material should hold moisture consistently – plaster with a water reservoir works well. Provide a small outworld for foraging that is easy for the ants to navigate. Escape prevention is absolutely critical: use fine mesh on all openings and ensure lids fit tightly. These ants can squeeze through gaps that other ants cannot. A naturalistic setup with damp soil and small hiding spots may also work, but watch for mold.

Temperature and Humidity

Keep the nest at 24–28°C, matching their tropical East African distribution ^[1][2]. A gentle temperature gradient lets the ants choose their preferred zone. Humidity should be high – keep the substrate consistently moist but not waterlogged. The collection sites (near termites, in leaf litter and banana plantation humus) ^[2] indicate a humid environment. Use a water reservoir connected to the nest to maintain humidity. Avoid placing the nest near air conditioning or heating vents that could cause rapid drying.

Feeding and Diet

Diet is unknown for this species. Based on related Proceratiinae, they are thought to be specialized predators that hunt small arthropods like springtails, mites, and other micro-invertebrates (inferred from subfamily characteristics). Offer tiny live prey – ideally no larger than 1–2 mm. Springtails are an excellent choice. Do not rely on sugar sources unless acceptance is confirmed, Proceratiinae are primarily predatory. Feed small amounts of live prey every few days and remove any leftovers to prevent mold. Given their tiny size, even small fruit flies may be too large.

Understanding Their Extreme Rarity

Described from Eritrea in 1910,with the synonym Probolomyrmex brevirostris described from Uganda in 1949,the species was synonymized by Taylor in 1965 ^[2]. Despite being known for over a century, only a handful of specimens exist. This suggests they are either extremely rare in the wild, live in very cryptic habitats that are rarely sampled, or both. The original collections note the worker was found "bei termiten" (near termites) and the queen was collected "among humus and leaves at the base of a tree with a few bushes forming an island in a banana plantation" ^[2]. These clues point to damp, shaded areas with organic matter.

Frequently Asked Questions

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References