Tetramorium drunex

Quick Summary

• Difficulty: Unknown
• Origin & Habitat: Northern China (Ningxia/Pengyang) in the Palaearctic region. The habitat consists of temperate grasslands and semi-arid areas with cold winters and warm summers ^[1].
• Colony Type: Unknown, only the worker caste has been described. No information exists on queen number or colony structure in the wild.
• Size & Growth:
  • Queen: Unknown, queens have not been described
  • Worker: Approximately 3-4mm, inferred from the Tetramorium genus ^[2]
  • Colony: Unknown, no colony data exists
  • Growth: Unknown
  • Development: Unknown, no development data exists. Based on typical Tetramorium patterns, estimate 6-10 weeks at warm temperatures ^[2] (Development timeline is estimated from genus-level data since no species-specific research exists)
• Antkeeping:
  • Temperature: Based on the temperate climate of Ningxia (northern China), aim for room temperature in the range of 18-24°C. Provide a slight gradient if possible so ants can self-regulate.
  • Humidity: Ningxia has a semi-arid to moderate climate. Keep substrate moderately moist, damp but not waterlogged. Allow some drying between waterings, but avoid both waterlogged conditions and complete drying out.
  • Diapause: Likely yes, temperate species from northern China almost certainly require a winter rest period. Expect 2-3 months at reduced temperatures (5-10°C) during winter.
  • Nesting: No specific nesting data exists. Most Tetramorium are ground-nesting ants that prefer soil or small cavities. A standard test tube setup works well for founding colonies. For larger colonies, use a plaster or Y-tong nest with small chambers.
• Behavior: Behavior is unstudied. Based on typical Tetramorium behavior, expect generalist foraging with workers actively searching for small prey and sugary substances. Workers are small and likely non-aggressive. Their defense mechanism (smear venom) is typical of the tribe Crematogastrini. Escape prevention should be moderate, their small size means they can squeeze through small gaps, so ensure barrier integrity (use fine mesh or fluon barriers).
• Common Issues: no biological data exists, this is one of the least studied ants in the hobby, colony structure is completely unknown, you may not know if your colony is monogyne or polygyne, queen biology is undescribed, founding behavior and claustral status are inferred from genus patterns, development timeline is estimated, actual timing may vary significantly, temperate origin means hibernation is likely required, skipping this may harm the colony

Background and Nomenclature

Tetramorium drunex has a complicated naming history. It was originally described as Tetramorium flavum in 2001 by Chang and He from specimens collected in China. However, researchers discovered in 2025 that the name Tetramorium flavum was already being used for a different ant species, it had been previously given to what was then called Tetramorium gambogecum var. flavus back in 1941. When an older name is discovered, the newer name must be changed to avoid confusion. Brian L. Fisher officially renamed this species to Tetramorium drunex in 2025,using an arbitrary combination of letters as the new name. The type specimen (the individual used to describe the species) is a worker collected in Pengyang, Ningxia, and it is stored at NUYC (Ningxia University) ^[1].

Known Distribution and Habitat

This species is known only from northern China, specifically the Ningxia region. Ningxia is located in north-central China and has a continental temperate climate. Winters are cold (often below freezing) and summers are warm. The landscape consists largely of grasslands and semi-arid plains. This suggests the species is adapted to seasonal temperature extremes and likely spends cold periods in some form of dormancy. The specific microhabitat where the type specimen was found is not detailed in available literature, but most Tetramorium species nest in soil or under stones in open areas ^[2].

What We Do Not Know

Honesty requires acknowledging how little biological information exists for this species. We have no description of the queen, no colony size data, no information on whether colonies have one queen or multiple, no data on what they eat in the wild, no development timeline measurements, and no observations of their behavior. The queen caste has never been described scientifically. This is not unusual for many ant species, most are never deeply studied, but it does mean you will be pioneering much of what we know about keeping this species in captivity. Expect to learn through observation and experimentation rather than following established care protocols.

General Care Approach

Since specific biological data is lacking, we can make reasonable inferences from the genus and geographic origin. Tetramorium ants are typically small, ground-dwelling generalists that nest in soil and forage actively. The Ningxia origin strongly suggests they need a winter diapause period. For housing, start with a standard test tube setup for founding colonies. Once established, a small plaster or Y-tong nest with narrow chambers works well. Feed a varied diet of small protein sources (fruit flies, small mealworms) and sugar water or honey. Keep temperatures in the 18-24°C range with a slight gradient. The substrate should be kept moderately moist, damp but not waterlogged. Given their small size, use fine mesh on any ventilation to prevent escapes. ^[2]

Hibernation and Seasonal Care

Based on the temperate climate of their native Ningxia region, this species almost certainly requires an annual hibernation period. In captivity, you should provide a winter rest period of approximately 2-3 months. Reduce temperatures to around 5-10°C (a refrigerator or cold cellar works well). Reduce feeding significantly during this period and keep the nest slightly moist but not wet. Do not feed during deep hibernation. In spring, gradually warm the colony back to room temperature and resume normal feeding. Skipping hibernation may weaken or kill the colony over time, as this seasonal cycle is deeply ingrained in their physiology. ^[2]

Defense Mechanism

Based on its taxonomic classification (subfamily Myrmicinae, tribe Crematogastrini), Tetramorium drunex likely uses a 'smear' defense mechanism. Instead of piercing with a stinger, workers have a modified, flattened spatulate stinger used to wipe or smear venom onto enemies. This is a general characteristic of the tribe and has not been specifically studied for this species.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References