Strumigenys rehi

Strumigenys rehi

Strumigenys rehi is a tiny predatory ant measuring just 3.3-3.7mm in total length ^[1]. Workers have distinctive large eyes and relatively long mandibles (mandibular index over 85), features that indicate an arboreal lifestyle ^[2]. The species belongs to the Strumigenys mandibularis group, specifically the cordovensis-complex, and is the only species in this complex that lacks standing hairs on the first gastral tergite ^[2]. These ants are specialized predators, using their snap-trap mandibles to capture tiny prey like springtails.

This species was originally discovered in Brazil (Amazonas, Manaus) when workers were intercepted in orchid plants arriving at Hamburg, Germany, a finding that strongly supports their arboreal nesting habits ^[2]. The species is known from Brazil and Colombia in the Neotropical region ^[1].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Brazil and Colombia in the Neotropical region. Originally collected from orchid plants, indicating an arboreal habitat ^[2].
• Colony Type: Unknown colony structure, likely single-queen based on typical Strumigenys patterns
• Size & Growth:
  • Queen: Unknown for this species
  • Worker: 3.3-3.7mm ^[1]
  • Colony: Unknown for this species
  • Growth: Moderate, based on typical Strumigenys development patterns
  • Development: Estimated 8-12 weeks at optimal temperature based on related species (Direct development data unavailable for S. rehi, estimates based on genus-level patterns for small Myrmicinae)

Housing and Nest Setup

Strumigenys rehi requires careful housing due to its tiny worker size of just 3.3-3.7mm ^[1]. Use an acrylic nest or Y-tong setup with chambers appropriately scaled to their small size. The chambers should be tight and snug, larger open spaces can stress these tiny ants. Because they were found in orchid plants and have large eyes indicating arboreal habits, they likely prefer nesting in preformed cavities rather than digging in soil ^[2]. A small outworld area connected to the nest allows for hunting territory. Escape prevention is critical, use fine mesh barriers and ensure all connections are sealed. These ants cannot climb smooth surfaces as well as some other species, but their tiny size means they can still slip through surprisingly small gaps.

Feeding and Diet

Strumigenys rehi is a specialized predator that requires live prey. In the wild, these ants hunt springtails (Collembola) and other tiny arthropods using their specialized snap-trap mandibles ^[2]. In captivity, you must establish a reliable springtail culture, this is the primary food source. Other tiny live prey like fruit fly larvae, booklice, and dust mites may be accepted, but springtails should form the bulk of their diet. Do not rely on sugar sources or dead protein, these ants are obligate predators and will not accept conventional ant foods. Feed every 2-3 days, offering small amounts of live prey. Remove uneaten prey after 24 hours to prevent mold. Establishing and maintaining a thriving springtail culture is the single biggest challenge in keeping this species.

Temperature and Care

As a tropical species from Brazil and Colombia, Strumigenys rehi needs warm temperatures. Keep the nest area at 24-28°C, this range supports normal activity and brood development ^[2]. A slight temperature gradient allows the colony to self-regulate. Use a heating cable or mat on one side of the nest if your room temperature is below this range. Place heating on top of the nest, not underneath, to avoid evaporating moisture too quickly. These ants need high humidity (70-85%) to match their Amazonian origin. Monitor condensation levels in the nest, some condensation is normal and beneficial, but excessive moisture leads to mold. Use adequate ventilation to prevent stagnant air while maintaining humidity.

Behavior and Temperament

Strumigenys rehi is a calm, non-aggressive ant that poses no threat to keepers. Their small size means they cannot sting effectively, and they lack the painful defensive abilities of larger ant species. Workers are active hunters that will search out and capture small live prey. They do not form large colonies, expect modest numbers of workers even in established colonies. The species shows typical Strumigenys hunting behavior where workers use their snap-trap mandibles to quickly seize prey items. They are not known for escape attempts beyond what their tiny size naturally permits, but excellent barrier maintenance is still essential. Colonies are likely relatively quiet in terms of activity level compared to more active foragers. ^[1]

Frequently Asked Questions

References