Tetramorium shensiense

Quick Summary

• Difficulty: Medium
• Origin & Habitat: China: Shaanxi, Jiangxi, and Hainan Province in the Palaearctic region ^[1][2]. Found in diverse habitats including urban areas and subtropical forests.
• Colony Type: Monogyne – single-queen colonies (inferred from typical Tetramorium colony structure, but no species-specific data available).
• Size & Growth:
  • Queen: Approximately 6-7mm (inferred from Tetramorium genus patterns – direct measurement not available)
  • Worker: 3.7-3.8mm ^[1]
  • Colony: Up to several hundred workers (estimated based on genus patterns)
  • Growth: Moderate – seasonal activity suggests summer and autumn growth ^[4]
  • Development: Estimated 6-8 weeks at optimal temperature, typical for Tetramorium (Development likely occurs during warm summer months when colony activity is highest)
• Antkeeping:
  • Temperature: Keep at 20-26°C during the active season. Optimal brood development likely around 24-26°C based on summer/autumn foraging peak ^[4]. Provide cooler winter conditions for diapause.
  • Humidity: Moderate – keep nest substrate lightly moist but not waterlogged. No specific data, adjust based on typical Tetramorium needs.
  • Diapause: Yes – required. Field data shows near-zero winter activity (4 vs 1407 in autumn), indicating a mandatory diapause ^[4]. Keep at 10-15°C for 2-3 months during winter.
  • Nesting: In nature, likely nests in soil or under stones (inferred from Tetramorium nesting habits). In captivity, use test tubes, Y-tong, plaster, or soil nests with appropriately sized chambers for 3-4mm workers.
• Behavior: Docile and not aggressive toward keepers. As opportunists, they are adaptable and quick to colonize new areas. Their small size (under 4mm) makes escape prevention critical – use fine mesh barriers. They belong to the tribe Crematogastrini and possess a modified, flattened stinger used to smear venom rather than pierce (general subfamily trait). Workers are active foragers, likely searching for small prey and sugary substances. They show strong seasonal activity, becoming much less active in winter.
• Common Issues: escape prevention is critical due to their tiny 3.7-3.8mm size – they can squeeze through standard gaps easily, winter die-offs are common if proper diapause conditions are not provided – they require a cold period, colonies may appear dead in winter but are simply in hibernation – do not discard until spring, slow initial colony growth is normal – founding colonies take time to establish, test tube setups can dry out quickly in heated rooms – monitor moisture levels regularly

Appearance and Identification

Tetramorium shensiense workers are 3.7-3.8mm long and yellow-brown to orange-brown, with the base of the antennal scape stained blackish-brown or black ^[1]. The head and body have many standing hairs ^[1]. Mandibles have striae, the head has relatively weak longitudinal striae and inconspicuous reticulate lines, the mesosoma has weak reticulate striae, strongest on the pronotum, the first petiolar node has weak wrinkles on its dorsum and sides, the second node and gaster are smooth ^[1]. The clypeus has three strong carinae and a shallow notch in the front center, the frontal carinae are long and almost reach the occipital margin, with a vertical low semi-transparent lamella ^[1]. Antennae have 11 segments, with a short scape (SI less than 80) ^[1]. Propodeal spines are long, narrow, and slightly upcurved, and the lateral lobes are broad blunt triangles ^[1]. The first petiolar node has a slightly convex dorsum in profile, with nearly straight front and rear sections, the second node is round and clearly lower than the first ^[1].

Housing and Nest Setup

For a founding colony, a test tube with a water reservoir and cotton plug works well. Keep it dark and undisturbed until first workers appear. Once the colony has around 20 workers, you can move them to a small formicarium. Y-tong (AAC) or plaster nests are good choices because they hold humidity well and have appropriately sized chambers for 3-4mm ants. Since workers are only 3.7-3.8mm, seal all connections with fine mesh or tight lids to prevent escapes. A small outworld for foraging lets you feed and observe without disturbing the nest. ^[1]

Feeding and Diet

Tetramorium shensiense is an opportunist and accepts a varied diet ^[4]. Provide protein (small insects like fruit flies, pinhead crickets, or mealworms) 2-3 times per week, and keep a sugar source (honey water, sugar water, or ant nectar) available at all times. Because they are tiny, offer very small portions – a drop of honey water or a small insect piece is plenty. Remove uneaten food after 24-48 hours to prevent mold. They will exploit a wide range of food resources.

Temperature and Seasonal Care

This species has a clear seasonal pattern: peak foraging in summer and autumn, almost no activity in winter ^[4]. Maintain 20-26°C during the active season, with 24-26°C likely optimal for brood development. In autumn, gradually reduce temperature to trigger diapause. During winter (roughly November to February in the Northern Hemisphere), keep the colony at 10-15°C for 2-3 months. Stop feeding during hibernation but keep the nest slightly moist. In spring, slowly warm them back to room temperature and resume feeding. This seasonal cycle is essential for long-term health and reproduction.

Behavior and Colony Dynamics

Tetramorium shensiense workers are active foragers and relatively docile. They cannot sting (they belong to the tribe Crematogastrini and have a modified, flattened stinger used to smear venom) but may bite if threatened. As opportunists, they adapt quickly to changes in environment and food availability ^[4]. The queen will focus on egg-laying while workers tend brood and forage. Colony growth is moderate: expect the first nanitics within 6-8 weeks if kept warm (24-26°C), then steady growth through the warm months. Mature colonies may reach several hundred workers over a few years.

Frequently Asked Questions

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References