Centromyrmex sellaris

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Tropical and subtropical Africa, from lowland forests to savanna regions. In the wild, they nest exclusively inside active termite mounds of the genus Odontotermes, living in close proximity to their prey ^[1][3]. Found at elevations around 110 m in Gabon forest zones ^[4].
• Colony Type: Likely monogyne (single queen) based on typical Ponerinae patterns, though colony structure is not directly documented. Workers are blind, indicating a highly specialized underground (hypogaeic) lifestyle ^[2].
• Size & Growth:
  • Queen: 6.9 mm ^[1]
  • Worker: 4.8-6.1 mm ^[1]
  • Colony: Unknown, likely small, up to a few hundred workers at most, based on their specialized predator lifestyle.
  • Growth: Unknown, likely slow due to specialized diet requirements.
  • Development: Unknown, no direct data. Based on typical Ponerinae patterns in tropical species, estimate 6-10 weeks at optimal temperature. (No specific development studies exist for this species. Related Ponerines typically take 6-12 weeks from egg to worker at warm temperatures.)
• Antkeeping:
  • Temperature: Keep warm, around 24-28°C. As a tropical African species from termite mounds, they need consistently warm conditions without temperature drops. A heating cable on one side of the nest creates a gradient ^[2].
  • Humidity: High humidity is essential, they naturally live inside termite mounds which maintain humid, stable conditions. Keep the nest substrate consistently moist but not waterlogged. The substrate should feel damp to the touch, with some slightly drier areas available for the ants to regulate their position.
  • Diapause: No, as a tropical species from Africa, they do not require hibernation. Keep them at warm temperatures year-round.
  • Nesting: Y-tong (AAC) nests or plaster/naturalistic setups work well. They prefer dark, enclosed spaces and will not use exposed outworlds much. Provide a soil-filled chamber or substrate that allows them to dig and maintain humidity. The nest should mimic the humid, enclosed environment of a termite mound.
• Behavior: Extremely specialized termite predators with blind workers, they rely on vibrations and chemical cues rather than vision ^[2]. They are not aggressive toward keepers but their specialized diet makes them challenging to keep. Workers are likely poor climbers and unlikely to escape aggressively, but their small size (under 6 mm) means standard escape prevention measures should still be used. They are hypogaeic, meaning they spend almost all their time underground in the nest chambers.
• Common Issues: specialized diet, they require termites and will not accept standard ant prey like mealworms or crickets, high humidity needs, drying out quickly kills colonies, blind workers mean they are easily stressed by light and disturbance, slow growth and low colony sizes make them vulnerable to losses, difficulty obtaining regular termite food supply in captivity

Feeding and Diet - The Critical Challenge

This is the most challenging aspect of keeping Centromyrmex sellaris. They are obligate termite predators, meaning they only eat termites ^[2]. In the wild, they raid termite mounds and have evolved specialized morphology (blind workers, digging legs) to infiltrate and hunt inside termite galleries. In captivity, you must provide a regular supply of live termites. Termite workers (not alates) are the ideal food. You can collect termites from decaying wood or purchase them from some reptile suppliers. Other small live prey is unlikely to be accepted, this species has evolved specifically for termite hunting and shows no flexibility in diet. Do not rely on sugar water, honey, or standard insect prey. Feeding frequency depends on colony size, but plan to provide termites every few days for established colonies.

Housing and Nest Setup

Centromyrmex sellaris requires a humid, dark, enclosed nest environment that mimics the interior of a termite mound. Y-tong (AAC) nests or plaster formicaria work well because they hold humidity. The nest chambers should be relatively small and enclosed, these ants are adapted to tight underground spaces. Provide a small outworld for feeding, but expect minimal activity outside the nest. A naturalistic setup with a soil-filled chamber allows for more natural digging behavior and better humidity control. Keep the entire setup in a dark location or use a nest box to block light, blind workers are stressed by bright conditions. The nest material should retain moisture well without becoming waterlogged. ^[1][3][2]

Temperature and Humidity Requirements

As a tropical African species, Centromyrmex sellaris needs warm, stable temperatures around 24-28°C. Avoid any temperature drops below room temperature. A heating cable placed on part of the nest creates a gradient allowing ants to thermoregulate. Place the heating on top of the nest to avoid drying out the substrate. Humidity is critical, these ants naturally live inside termite mounds which maintain very high, stable humidity. Keep the nest substrate consistently moist. Check moisture levels daily and rehydrate as needed rather than on a fixed schedule. Poor humidity quickly leads to colony death. Do not confuse the high humidity they need with ventilation, they need both adequate ventilation to prevent mold and high humidity, but avoid strong airflow that dries the nest. ^[2]

Understanding Their Specialized Biology

Centromyrmex sellaris represents an extreme example of specialization in the ant world. Their workers are blind, they have reduced eyes and navigate using vibrations and chemical signals ^[2]. Their legs are modified with stout, spine-like setae (bristles) that help them dig through hard termite mound material ^[2]. This specialization means they are poorly adapted to any lifestyle other than raiding termite colonies. The species is found across much of sub-Saharan Africa, making it the most widespread member of its species group ^[1][3]. They are collected from Odontotermes termitaries, the genus of their preferred termite prey ^[1]. This specialization explains why they are rarely kept and considered an expert-level species. Understanding their unique biology helps keepers appreciate why standard ant-keeping approaches fail with this species.

Colony Founding and Growth

No direct observations of colony founding exist for this species. Like most Ponerinae, the queen likely seals herself in a chamber and raises the first brood alone (claustral founding), living on stored fat reserves until the first workers emerge. However, this is an inference from related species, not documented behavior. Colony growth is likely slow, specialized predators typically maintain smaller colonies than generalist species. Expect a colony to remain small (under 100 workers) for the first year or two. The queen measures 6.9 mm and workers are 4.8-6.1 mm ^[1]. Given their specialized diet requirements, colonies are vulnerable during the founding stage when the queen cannot forage. Ensure the founding chamber remains humid and undisturbed.

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References