Strumigenys rufobrunea

Quick Summary

• Difficulty: Hard
• Origin & Habitat: West Africa (Guinea, Ghana, Ivory Coast, Nigeria, Benin, Cameroon, Democratic Republic of Congo, Togo). Found in rainforest, gallery forest, and tree-shaded savannah. This is a leaf-litter species that nests in the ground, often in mango orchards ^[1]. Recorded in Nigeria ^[3].
• Colony Type: Colony structure is unconfirmed for this species. The closely related Strumigenys rogeri forms single-queen colonies, but it is not clear if Strumigenys rufobrunea follows the same pattern.
• Size & Growth:
  • Queen: Queen size data is unavailable. No total length measurements exist in literature.
  • Worker: 1.8-2.0 mm total length ^[1].
  • Colony: Colony size in the wild is unknown. Based on related Strumigenys species, colonies are likely small, probably under 100 workers.
  • Growth: Likely slow, as typical for dacetine ants, but unconfirmed.
  • Development: Unconfirmed, estimated 6-10 weeks based on related species, but no direct data exists. (No direct development data exists for this species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, they come from tropical West Africa. Provide a gentle temperature gradient. Avoid temperatures below 22°C as this may harm the colony.
  • Humidity: High humidity is essential. Keep the nest substrate consistently moist but not waterlogged, as they are leaf-litter ants from rainforest. A layer of leaf litter helps retain moisture.
  • Diapause: No diapause required. Being a tropical species, maintain warm temperatures year-round.
  • Nesting: Ground-nesting leaf-litter species. A naturalistic setup with moist substrate and leaf litter works well. Y-tong or plaster nests with narrow chambers are suitable. Avoid large open spaces.
• Behavior: Workers forage alone, hunting small prey in leaf litter ^[2]. They are not aggressive and will flee when disturbed. Their tiny size (2 mm) means even small gaps in the enclosure allow escapes, use fine mesh and tight seals.
• Common Issues: escape prevention is critical, their tiny 2 mm size means they can slip through the smallest gaps, requiring fine mesh barriers and tight-fitting lids, specialized diet makes them difficult, they require live small prey (springtails, micro-arthropods) and may not accept sugar or dead food, slow growth tests keeper patience, dacetine ants develop slowly and colonies remain small, humidity must be maintained, being leaf-litter species, they quickly decline in dry conditions, wild-caught colonies may have parasites that kill them in captivity

Housing and Nest Setup

Strumigenys rufobrunea requires a setup that recreates their natural leaf-litter habitat. A naturalistic terrarium with moist substrate works well, use a mixture of soil and leaf litter to provide both nesting material and hunting grounds. Alternatively, a Y-tong (AAC) or plaster nest with narrow chambers scaled to their tiny size can work, but ensure the chambers are tight enough that they feel secure. The key is maintaining high humidity while avoiding flooding. Place a water reservoir connected to the nest via cotton to provide moisture without drowning the colony. Because they are so small, even minor gaps in their enclosure can lead to escapes, inspect all connections and use fine mesh on any ventilation holes.

Feeding and Diet

This is the most challenging aspect of keeping Strumigenys rufobrunea. They are specialized predators that hunt small arthropods in nature, and in captivity they need live prey ^[2]. Their primary food should be live springtails, these tiny insects are the ideal size and nutritional profile. Other micro-arthropods like minute soil mites, tiny booklice, and small fruit fly larvae may be accepted. Do not rely on sugar water, honey, or dead commercial insect prey, these ants are unlikely to accept them. Offer small live prey every 2-3 days, removing any uneaten prey after 24 hours to prevent mold.

Temperature and Humidity

Maintain temperatures in the 24-28°C range, these are tropical ants from West Africa and need consistent warmth. A small heating cable on one side of the nest creates a temperature gradient. Avoid temperatures below 22°C as this can slow activity and potentially harm the colony. Humidity is equally critical, aim for high humidity in the nest area, keeping the substrate consistently damp but never waterlogged. Mist the outworld occasionally but focus on maintaining moisture in the nest itself. Poor humidity leads to colony decline faster than incorrect temperature. A layer of leaf litter in the setup helps retain moisture naturally.

Behavior and Colony Life

Strumigenys rufobrunea workers forage alone, hunting small prey in the leaf litter layer ^[2]. They use a patient, stalking approach rather than the explosive strikes of trap-jaw ants. Colonies remain small, expect under 100 workers even in established colonies. Workers are not aggressive and will flee rather than attack when disturbed. The colony will likely establish a single nest site in the substrate or nest chamber, with foragers venturing out to hunt. Because they are so small and secretive, observing them requires patience and careful observation of the nest entrance.

Acquiring and Starting a Colony

This species is not commonly available in the antkeeping hobby. If you obtain a colony, it will likely be through a specialized supplier or rare import. If you catch a queen during nuptial flights (timing is unknown for this species), you would need to house her in a small test tube setup with moist cotton. Given that founding behavior is unconfirmed ^[4], assume she may need to forage during founding (semi-claustral) and provide small live prey once she lays eggs. However, without documented founding behavior, this is an educated guess. The safest approach is to obtain an established colony with workers, as the specialized diet makes founding colonies extremely difficult.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References