Temnothorax strymonensis

Temnothorax strymonensis

Temnothorax strymonensis is a tiny ant species from the Mediterranean region, first described in 2018. Workers measure just 4-6mm and have a distinctive yellow to dark orange body with a brown to black transverse band on the first gastral tergite (the rear part of the abdomen). This band is usually narrower than one-third of the tergite length and often has a narrow break in the middle. The species belongs to the Temnothorax interruptus group and can be identified by its FL/SL ratio exceeding 0.45,which separates it from the similar T. morea ^[1][2].

This species occupies a wide range across the East Mediterranean, found in Greece, southern Bulgaria, Croatia along the Adriatic coast, and Turkey. It lives in various habitats from stream valleys with deciduous forests to mountain pastures, nesting primarily in shaded areas under moss or in limestone crevices at altitudes between 10 and 1550 meters ^[1]. The species name refers to the ancient Strymon River (now Struma) in Bulgaria, which is the type locality.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: East Mediterranean species found in Greece, southern Bulgaria, Croatia, and Turkey. Inhabits stream valleys with deciduous or mixed forests, open oak woodlands, mountain pastures with phrygana and oak shrubs, and occasionally montane conifer forests. Nests in shaded areas under moss or in limestone crevices ^[1][3].
• Colony Type: Single-queen (monogyne) colonies. Colony size is moderate, likely reaching several hundred workers based on related species in the genus.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Approximately 5-6mm (estimated based on related species and gyne measurements in original description)
  • Worker: 4-6mm (cephalic size 515 ± 29 μm or 0.461-0.592mm) ^[2]
  • Colony: Estimated several hundred workers based on related Temnothorax species
  • Growth: Moderate
  • Development: Estimated 6-10 weeks at optimal temperature based on typical Temnothorax development (Development time inferred from genus-level data, specific measurements for this species are not available)
• Antkeeping:
  • Temperature: Keep at 20-24°C. This species tolerates a range from cool mountain elevations to warmer lowland areas (10-1550m altitude), so room temperature is likely suitable. A gentle gradient allows workers to self-regulate.
  • Humidity: Moderate humidity around 50-60%. Provide a moist area in the nest for brood, but avoid waterlogging. The species naturally inhabits shaded, somewhat damp microhabitats under moss.
  • Diapause: Yes, likely requires a winter rest period of 2-3 months at 5-10°C, consistent with other European Temnothorax species
  • Nesting: Prefers tight chambers and narrow passages scaled to their tiny size. Y-tong (AAC) nests or small acrylic/formicarium setups work well. Provide moss or small crevice-like spaces to mimic their natural limestone crevice nesting. Test tubes with cotton can work for founding colonies.
• Behavior: Generally peaceful and non-aggressive. Workers are small but active foragers. They may form tandem running chains to recruit nestmates to food sources, a common behavior in Temnothorax. Escape prevention is critical due to their tiny size, use fine mesh barriers and tight-fitting lids. They are not known to sting and pose no danger to keepers.
• Common Issues: escape prevention is critical due to their very small size, they can squeeze through standard barrier gaps, slow founding phase, claustral queens seal themselves in and may take months before first workers emerge, colonies are slow to establish and may appear inactive during founding, resist the urge to disturb, test tube setups can flood if water reservoirs are too large for such small colonies, wild-caught colonies may carry parasites that can devastate captive populations

Housing and Nest Setup

Temnothorax strymonensis is a tiny ant, so your housing setup must reflect their small size. Y-tong (AAC) nests with narrow chambers work exceptionally well because they mimic the tight limestone crevices these ants naturally nest in. Acrylic nests with small chambers are also suitable. For founding colonies, a standard test tube setup works, but ensure the cotton is packed firmly, these tiny ants can easily escape through gaps that larger species would ignore. The nest should have both a moist area (for brood) and a drier area (for the queen and workers to rest). A small piece of moss in the outworld adds enrichment and helps maintain humidity. Because they are so small, escape prevention must be excellent, apply Fluon or similar barriers to all edges and use fine mesh for any ventilation holes ^[1][3].

Feeding and Diet

Like most Temnothorax species, T. strymonensis is omnivorous with a preference for protein. Offer small live prey such as fruit flies, pinhead crickets, or small mealworms. They will also accept sugar sources, a drop of honey water or sugar water can be offered occasionally. In the wild, they forage for small insects and tend aphids for honeydew. Feed founding colonies small amounts every few days, removing any uneaten prey to prevent mold. Once established, offer protein 2-3 times per week and keep a constant sugar source available. Their small size means even tiny prey items are substantial meals for them.

Temperature and Seasonal Care

This species tolerates a wide temperature range in the wild (found from 10-1550m elevation), so captive colonies do well at room temperature, ideally 20-24°C. Avoid temperatures above 28°C or below 15°C for extended periods. Like other European Temnothorax, they benefit from a winter dormancy period. Reduce temperature to 5-10°C for 2-3 months during winter (typically November-February in the Northern Hemisphere). During this time, reduce feeding significantly and keep the nest slightly moist but not wet. Do not feed during deep dormancy. The cooling period helps trigger proper reproductive cycles and keeps colonies healthy long-term. ^[1]

Colony Founding

Temnothorax strymonensis is claustral, the queen seals herself in a small chamber and raises her first brood without leaving to forage. She relies entirely on her stored fat reserves (visible as a thick mesosoma) to survive and feed the larvae. Expect the founding process to take 4-8 weeks before eggs appear, then another 4-8 weeks before nanitic (first) workers emerge. During this time, the queen will be completely sealed in and you should resist the urge to check on her, disturbance can cause her to abandon or eat the brood. Keep the founding setup in a dark, quiet place at stable room temperature. Once the first workers emerge (nanitics will be smaller than normal workers), you can begin offering tiny food items near the nest entrance.

Behavior and Observation

These ants are peaceful and not aggressive toward keepers. Workers are active and can be observed foraging in the outworld. Like other Temnothorax, they may use tandem running, where one worker leads another to a food source, as a recruitment method. This makes them fascinating to watch as the colony grows. They are not known to sting and pose no danger to humans. Their small size and dark coloration with the distinctive abdominal band make them visually distinctive. Watch for the characteristic dark transverse band on the first gastral tergite, this is one of the key identification features of this species and helps distinguish it from similar Temnothorax in the region ^[1][2].

Growth and Development

Colony growth is moderate. After the founding stage (nanitic workers), subsequent broods develop faster as the queen can focus on egg production rather than tending first larvae alone. A well-established colony may reach several hundred workers over 1-2 years. Growth rate depends heavily on temperature, warmer (within range) temperatures speed development, while cooler temperatures slow it. The brood develops through all stages (egg, larva, pupa) in the nest chambers. You may notice the queen spending more time tending brood during early stages, then less as the worker force grows. Mature colonies may produce alates (reproductives) annually if conditions are favorable.

Frequently Asked Questions

References