Tetramorium guineense

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Restricted to West and Central African rainforests: Guinea, Ghana, Ivory Coast, Nigeria, Cameroon, Gabon, Central African Republic, Democratic Republic of Congo, Liberia, Senegal, Somalia, and Zaire ^[3][2]. Inhabits rainforest leaf-litter layer and nests in rotten stumps or dead logs with adherent bark ^[1].
• Colony Type: Typically single-queen, but colonies with two queens have been found in introduced greenhouse populations ^[4], so facultatively polygynous.
• Size & Growth:
  • Queen: Size data unavailable (queen caste remains undescribed in literature) ^[5]
  • Worker: 2.9-3.7 mm ^[1]
  • Colony: No specific data available, similar species reach a few hundred workers
  • Growth: Moderate
  • Development: 6-8 weeks (estimated based on typical Tetramorium development at warm temperatures) (Development time depends on temperature, warmer conditions within the safe range speed it up)
• Antkeeping:
  • Temperature: Keep at 24-28 °C, a typical tropical range for this rainforest species ^[1]. Use a heating cable on one side for a gradient.
  • Humidity: Keep the nest substrate consistently damp but not waterlogged. These rainforest ants need high humidity, mist occasionally or use a water reservoir.
  • Diapause: No, this tropical species does not need hibernation. Keep temperatures stable year-round.
  • Nesting: They naturally nest in rotting wood, dead logs, and under bark ^[1]. In captivity they do well in Y-tong (AAC), plaster, or naturalistic setups with rotten wood pieces. Test tubes with a water reservoir and dark cover also work.
• Behavior: Predaceous, actively hunts small insects and arthropods in the leaf litter ^[1]. Also tends coccids and aphids for honeydew ^[4]. Workers follow fixed foraging paths and are moderately aggressive when defending the nest. Their small size (under 4 mm) requires fine mesh barriers to prevent escape. They move quickly when disturbed.
• Common Issues: small size makes escape easy without very fine mesh barriers, predaceous diet means they prefer live prey, though they may accept dead food moved with forceps, colonies can become stressed if temperatures drop below 22 °C for extended periods, high humidity requirements can promote mold if ventilation is poor, balance moisture with airflow, wild-caught colonies may carry parasites that can kill the colony

Housing and Nest Setup

Tetramorium guineense does well in various nest types. Y-tong (AAC) or plaster nests provide the dark, humid conditions they need. Naturalistic setups with pieces of rotten wood mimic their natural nesting preference (rotten stumps and dead logs with bark) ^[1]. Test tubes work for founding and small colonies, use a water reservoir and cover with a dark sleeve.

The outworld should have escape-proof barriers, these ants are small (under 4 mm) and can squeeze through tiny gaps. Use fluon on the rim and fine mesh over ventilation holes. They follow fixed foraging paths, so connecting tubes with a simple layout works well ^[4].

Feeding and Diet

These ants are predaceous and hunt small insects and arthropods ^[1]. In captivity, offer live prey such as fruit flies, small crickets, mealworms, or other small insects 2-3 times per week. They also accept dead protein items if moved with forceps. They have been observed feeding on ripe fruit (papaya) and are attracted to flowers ^[6][7]. Additionally, they tend hemipterans for honeydew ^[4], so you can offer sugar water or diluted honey once or twice a week. Remove uneaten prey within 24 hours.

Temperature and Seasonal Care

As a tropical species, Tetramorium guineense needs warm temperatures. Keep the nest at 24-28 °C. Temperatures below 22 °C can slow activity, and sustained cold can be fatal. Use a small heating cable on one side to create a gradient, workers will choose their comfort zone. Because this species comes from rainforests without winter, it does not require any diapause. Maintain stable warmth year-round ^[1].

Humidity Management

These rainforest ants need high humidity. The nest substrate should feel consistently damp but not waterlogged. Standing water can drown brood. In test tube setups, a water reservoir with a cotton plug works. In Y-tong or plaster nests, you can mist directly or use built-in reservoirs. Good ventilation is important to prevent mold, small mesh-covered holes help balance humidity and airflow ^[2][1].

Colony Founding and Early Development

Founding behavior is not documented for this species. Keepers should provide a small dark chamber with moist substrate (e.g., a test tube with water) and leave the queen completely undisturbed until the first workers appear. After that, start offering small live prey near the nest entrance. The development time from egg to first worker is estimated at 6-8 weeks at 24-28 °C.

Behavior and Temperament

Workers are active, predaceous, and hunt individually in the leaf litter. They also tend hemipterans for honeydew and walk in fixed columns on established paths ^[4][1]. When the nest is disturbed, workers rush out aggressively to defend it. Their main chemical alarm signal in the mandibular gland is 3-octanone (87% of the volatile secretion) ^[8]. Trail pheromones are species-specific compared to Tetramorium caespitum ^[9]. They have a modified stinger that smears venom onto enemies rather than piercing skin (typical of the tribe Crematogastrini), so they do not sting in the usual sense.

Frequently Asked Questions

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References