Cataulacus oberthueri

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Northeastern Madagascar, humid evergreen forest at 600-875m elevation ^[1]. Found in the Réserve Spéciale d'Anjanaharibe-Sud and western Masoala Peninsula.
• Colony Type: Unconfirmed, colony structure has not been studied for this species.
• Size & Growth:
  • Queen: Size data unavailable, no measurements exist for this species
  • Worker: Approximately 6-8mm, inferred from Cataulacus genus patterns
  • Colony: Unknown, no colony size data exists for this species
  • Growth: Unknown, development has not been studied
  • Development: Unknown, no species-specific development data exists (Development time is unconfirmed for this species)
• Antkeeping:
  • Temperature: Keep warm, roughly 24-28°C. This matches their native tropical rainforest habitat. Avoid temperatures below 22°C or above 32°C.
  • Humidity: High humidity required, aim for 70-85%. These forest ants need consistently moist conditions. Mist the outworld regularly and ensure the nest area retains humidity without becoming waterlogged.
  • Diapause: No diapause expected. As a tropical species from Madagascar, they do not experience cold winters. Maintain consistent warm, humid conditions year-round.
  • Nesting: Arboreal setup required. These ants naturally nest in hollow twigs, branches, and tree cavities. In captivity, they do well in Y-tong (AAC) nests, plaster nests with horizontal chambers, or naturalistic setups with cork bark and twigs. Avoid deep soil-based formicariums, they prefer elevated, enclosed spaces.
• Behavior: Relatively docile and not aggressive toward keepers. They are arboreal and spend most of their time in elevated spaces within the nest. Workers are active foragers and will search for food throughout their territory. They are not strong climbers on smooth surfaces but navigate rough surfaces well. Escape prevention is important, their flattened bodies allow them to squeeze through small gaps. Members of the subfamily Myrmicinae tribe Crematogastrini possess a modified flattened stinger used to smear venom onto enemies rather than pierce flesh.
• Common Issues: high humidity management is critical, too dry and colonies will fail, too wet and mold becomes a problem, arboreal nesting requirements mean standard ground-nest setups are unsuitable, escape prevention is important, their flattened bodies allow them to squeeze through small gaps, limited availability makes this species difficult to acquire, no species-specific care information exists, all care guidance is inferred from genus patterns, temperature and humidity requirements may be overestimated due to lack of direct data

Housing and Nest Setup

Cataulacus oberthueri requires arboreal-style housing that mimics their natural tree-dwelling habitat. Standard vertical formicariums designed for ground-nesting ants are not suitable. Instead, use Y-tong (AAC) nests with horizontal or slightly inclined chambers, plaster nests with multiple connected chambers, or naturalistic setups featuring cork bark, hollow twigs, and small branches. The nest should be positioned higher than the outworld to encourage natural arboreal behavior. Include plenty of climbing structures like twigs, branches, or rough-textured surfaces in the outworld. Test tube setups can work for founding colonies if placed horizontally or at a slight angle, but the colony will need to be moved to a more appropriate arboreal setup once it grows beyond 20-30 workers.

Feeding and Diet

Based on typical Cataulacus genus feeding patterns, these ants are omnivorous with a preference for protein sources. They likely feed on small insects, arthropods, and honeydew from sap-sucking insects in the wild. In captivity, offer a varied diet including small live insects like fruit flies, pinhead crickets, and mealworms. Sugar sources are generally accepted, offer diluted honey, sugar water, or commercial ant nectar periodically. Fresh water should always be available. Feed protein 2-3 times per week and maintain a constant sugar source. Remove uneaten prey after 24-48 hours to prevent mold issues in the humid environment they require.

Temperature and Humidity Management

Maintaining proper temperature and humidity is critical for keeping this species. They require temperatures of 24-28°C, which can be achieved with a small heat mat placed on one side of the nest (never directly on the nest material as it can cause drying). Humidity must be maintained at 70-85%, this is higher than most ground-nesting ant species require. Use a moisture reservoir in the nest (like a water tube in a Y-tong setup) and mist the outworld regularly. However, balance is essential: too much moisture leads to mold, while too little causes desiccation and colony decline. Monitor both conditions closely and adjust based on colony behavior and health.

Behavior and Activity Patterns

Cataulacus oberthueri is an arboreal species with behavioral adaptations for canopy dwelling. Workers are active foragers that search for food in the upper regions of their enclosure. They are not particularly aggressive and will typically flee rather than engage in confrontation. In captivity, they may be more active during dim lighting conditions. Their flattened body morphology allows them to navigate through narrow twig cavities and may assist in remaining stationary on vertical surfaces.

Frequently Asked Questions

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References