Tetramorium bevisi

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Native to Lesotho, South Africa, and Zimbabwe, found in Bushveld and agricultural areas, often at elevations up to 2560 m ^[1][2].
• Colony Type: Not recorded in published literature. Based on related Tetramorium species, it is assumed to be monogyne, but this has not been confirmed.
• Size & Growth:
  • Queen: Unknown – no measurements have been published for queens of this species.
  • Worker: 2.8–3.0 mm (total length) ^[1]
  • Colony: Unknown – no data on colony size for this species.
  • Growth: Unknown
  • Development: Unknown – not documented. In related Tetramorium species kept at warm temperatures, development takes 6–8 weeks, but this is a very rough estimate. (No specific developmental data exist for Tetramorium bevisi.)
• Antkeeping:
  • Temperature: Unknown – based on its high‑altitude habitat, this species likely prefers moderate temperatures around 20–24°C. Avoid overheating above 28°C. A temperature gradient (cool side of the nest) is recommended so workers can self‑regulate.
  • Humidity: Unknown – the Bushveld habitat is seasonally dry. Provide a humidity gradient: allow most of the nest to dry out slightly while keeping one small area lightly moist. Avoid waterlogging.
  • Diapause: Unknown – southern African species often experience a dry winter period. If colony activity slows in winter, reduce temperature to about 15–18°C for 2–3 months and reduce feeding. This is a precaution, not a proven requirement.
  • Nesting: Likely ground‑nesting (collected in pitfall traps). Use a Y‑tong (AAC), plaster, or soil‑based formicarium with chambers large enough for small workers. Alternatively, a test tube setup works for founding colonies.
• Behavior: Not well documented. As a small myrmicine ant, it is probably active and will defend the nest. Escape prevention is critical because workers are tiny (under 3 mm) – use fine mesh and fluon on all barriers. No specific data on foraging trails or aggression exist.
• Common Issues: escape risk due to tiny worker size – they can squeeze through gaps of 1 mm or less, limited published information means keepers must experiment cautiously with care parameters, overheating can be fatal – avoid temperatures above 30°C until more is known, wild‑caught colonies may introduce parasites or diseases that have not been studied

Housing and Nest Setup

Because so little is known about Tetramorium bevisi, housing should mimic a general ground‑nesting ant. A test tube with a water reservoir works well for founding, and you can later move the colony to a Y‑tong (AAC) or plaster nest. For naturalistic setups, a soil chamber with a separate outworld is fine. Escape prevention is the top priority – use fine stainless‑steel mesh on all ventilation holes and apply fluon or PTFE to rims. Workers are tiny (2.8–3.0 mm) and can slip through gaps you might not notice ^[1]. Keep the nest chambers relatively small to help the colony feel secure and to make it easier to maintain humidity gradients.

Feeding and Diet

No specific dietary studies exist for Tetramorium bevisi. Based on its habitat (Bushveld, vineyards), it probably eats small insects, nectar, and honeydew ^[2][1]. Offer a standard ant diet: sugar water or honey water for carbohydrates, and small protein items like fruit flies, pinhead crickets, or pieces of mealworm. Feed protein 2–3 times per week and remove leftovers after 24 hours to prevent mould. Adjust portions based on how many workers are present. Some colonies may show preferences – offer variety to see what they accept best.

Temperature and Seasonal Care

Published data on temperature preferences are absent. Because the type locality is at 2560 m elevation in Lesotho, the species likely experiences cool summers and cold winters. In captivity, start with a range of 20–24°C and watch colony activity. If growth is slow, try warming to 26°C on one side of the nest. Do not exceed 30°C. For winter, if you notice brood production stopping and workers becoming less active, you can give a gentle cooling period of 2–3 months at 15–18°C. This is entirely speculative – monitor the colony and adjust based on its behaviour. ^[1]

Colony Founding and Growth

How Tetramorium bevisi queens start colonies is unknown. Most Tetramorium species are claustral – the queen seals herself in a chamber and raises the first workers without feeding. For this species, it is safest to assume the same and provide a quiet, dark tube with water. The time from egg to first worker has not been recorded, in related species at warm temperatures it takes about 6–8 weeks, but this is just a guess. After the first workers (nanitics) appear, the colony will grow slowly at first. Because we lack data, there is no reliable timeline for reaching certain sizes. Be patient and avoid disturbing the queen during founding. ^[1]

Behavior and Temperament

No behavioural studies have been published for Tetramorium bevisi. As a member of the myrmicine tribe Crematogastrini, it is expected to have a modified stinger used to smear venom rather than inject it – a 'smear' defence. Reports from collectors suggest they are active and will aggressively defend their nest, but this is anecdotal. Their small size makes them excellent escape artists: always use barriers. Because they are unstudied, handle any nest disturbance with care and be prepared for unexpected behaviour. ^[1]

Frequently Asked Questions

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References