Tetramorium phasias

Quick Summary

• Difficulty: Unknown
• Origin & Habitat: Afrotropical forests from South Africa to eastern Africa, including Angola, Democratic Republic of Congo, Rwanda, Tanzania, Zimbabwe, Mozambique, Malawi, and Zambia ^[1][3].
• Colony Type: Social structure is unconfirmed
• Size & Growth:
  • Queen: Unknown (queen measurements not available in published data)
  • Worker: 2.9-3.6 mm ^[1]
  • Colony: Unknown (no published data on colony size)
  • Growth: Unknown
  • Development: Unknown (No published data on development speed.)
• Antkeeping:
  • Temperature: Unconfirmed. Based on African forest habitat, try 24-28 °C and watch colony response. Avoid overheating above 30 °C.
  • Humidity: Keep the nest substrate consistently moist but not waterlogged. These forest ants likely need moderate to high moisture.
  • Diapause: Unknown. Being an African species, they may not need a true winter diapause, but no data is available.
  • Nesting: Provide rotten wood pieces, cork, or a Y‑tong/plaster nest with moist substrate. They naturally use decaying wood and soil mounds ^[1].
• Behavior: Published behavioral data is lacking. Workers are small (under 4 mm), so escape prevention with fine mesh (0.5 mm or finer) is essential. As members of the Crematogastrini tribe, they have a modified spatulate stinger used to smear venom rather than pierce, a defensive method described for the tribe. Their temperament is unknown.

Housing and Nest Setup

In nature, Tetramorium phasias nests in rotting wood and soil ^[1]. For captivity, you can try a naturalistic setup with pieces of moist rotten wood, cork, or bark, placed in a container with good ventilation. Another option is a Y‑tong (AAC) or plaster nest with a water reservoir, keep the substrate damp but not flooded. Because the workers are tiny (under 4 mm), nest chambers should be small and narrow to mimic their natural cavities. A horizontal or slightly sloped nest works better than a deep vertical one. Always connect the nest to an outworld for foraging. Be careful with escape barriers, use fine mesh (0.5 mm) on all air holes and openings.

Feeding and Diet

No specific dietary data exists for this species. Based on what other Tetramorium eat, you can offer small insects (fruit flies, pinhead crickets, tiny mealworms) and sugar sources (honey water, sugar water). Feed small amounts of protein two to three times per week and keep a constant sugar source. Remove uneaten prey after 24-48 hours to prevent mold. Because the workers are only about 3 mm, make sure prey items are appropriately sized. ^[1]

Temperature and Heating

Temperature requirements have not been studied. Since these ants live in African forests, they likely prefer warm, stable conditions. Aim for 24-28 °C and watch how the colony reacts, if workers cluster in one area, they may be seeking a different microclimate. Use a small heating cable on one side of the nest to create a gentle gradient. Avoid temperatures above 30 °C, which could be deadly. If your home stays naturally warm (low‑to‑mid 20s °C), additional heating may not be necessary. ^[1]

Humidity Management

Humidity needs are not published, but the forest habitat suggests moderate to high moisture. Keep the nest substrate consistently moist, it should feel damp to the touch without pooling water. If using a test tube setup, make sure the water reservoir is sized to prevent flooding. For naturalistic nests, check regularly that the substrate hasn't dried out. Mist the outworld occasionally, but avoid letting water collect in the nest area. Good ventilation helps prevent mold while maintaining humidity. Sudden moisture changes can stress the colony. ^[1]

Colony Founding

There is no published information on how Tetramorium phasias queens found colonies. In many Tetramorium species, queens are claustral (they seal themselves in and raise the first brood on stored reserves), but this is not confirmed for T. phasias. If you obtain a queen, keep her in a dark, quiet test tube with a water supply and check only infrequently. The time to first workers is unknown, so patience is necessary. ^[1]

Behavior and Defense

Very little is known about this species' behavior. Workers are small and likely fast-moving, but aggression levels are undocumented. As members of the Crematogastrini tribe, they possess a modified, flattened stinger used to smear venom onto attackers rather than sting deeply, a defense strategy called “smearing.” This does not pose a significant threat to keepers, but avoid handling. Because workers are under 4 mm, they can escape through standard barriers, use fine mesh (0.5 mm or smaller) on all openings. The species has been recorded in Rwanda's Akagera National Park ^[2], extending its known range.

Frequently Asked Questions

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References