Temnothorax nylanderi

Temnothorax nylanderi

Temnothorax nylanderi is a tiny ant species native to Western and Central Europe, easily recognized by its small size (workers 2-3mm) and distinctive yellow-brown body with a dark band across the first abdominal segment ^[1]. These ants are forest dwellers that nest in the smallest cavities, hollow acorns, dead twigs, bark crevices, and old galls, which is how they earned their common name 'acorn ant' ^[2]. Colonies are small, typically containing 100-200 workers with a single queen, and can reach impressive densities of up to 10 nests per square meter in suitable habitat ^[3]. What makes T. nylanderi particularly interesting is their sophisticated communication: they use tandem running, where one ant physically leads another to food sources, adjusting their behavior based on distance and risk ^[4].

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to Western and Central Europe, from southern Scandinavia to the Caucasus, with the highest populations in deciduous and mixed forests of France, Germany, Belgium, and the Netherlands ^[5]. This species is strongly associated with old-growth forests, particularly oak-birch woodlands, where it nests in dead wood at ground level ^[2].
• Colony Type: Monogynous (single queen) colonies with 100-200 workers, though occasional polygynous nests have been recorded ^[3]. Colonies can occasionally fuse with each other, and intraspecific parasitism occurs where founding queens take over established colonies ^[6].
  • Colony: Monogyne
  • Founding: Semi-claustral, Pleometrosis
• Size & Growth:
  • Queen: 3-4 mm ^[1]
  • Worker: 2-3 mm ^[1]
  • Colony: 100-350 workers, commonly around 200 ^[1]
  • Growth: Slow
  • Development: Approximately 6-8 weeks at optimal temperature (estimated based on genus patterns) (First year produces only a few workers, colony reaches ~100 workers after about 5 years ^[1])
• Antkeeping:
  • Temperature: Keep at room temperature (18-22°C). This species prefers cooler conditions than many ants, in the wild they inhabit shaded forest floors with high humidity around 85% ^[1]. Avoid overheating.
  • Humidity: High humidity is essential, these ants naturally live in damp forest litter and rotting wood. Keep nest substrate consistently moist but not waterlogged. A humidity level of 70-85% mimics their natural habitat.
  • Diapause: Yes, requires a winter hibernation period of 3-4 months at 5-10°C, typically from November to March in temperate regions ^[1]. Colony founding queens overwinter alone in their sealed chamber before laying eggs in spring.
  • Nesting: Tiny cavities suit them best, test tubes with cotton stoppers, small acrylic nests, or natural setups with acorns/hollow twigs. They readily accept Y-tong nests with narrow chambers scaled to their small size. Nest sites should be dark and humid.
• Behavior: Generally peaceful and non-aggressive toward humans, workers are too small to sting effectively. They are active foragers using tandem running to recruit nestmates to food sources ^[4]. Workers forage primarily within 50cm of the nest and are efficient at finding scattered resources ^[7]. Colonies readily relocate when disturbed and can fuse with neighboring colonies. Escape risk is moderate, their small size means they can slip through small gaps, so fine mesh is recommended.
• Common Issues: High humidity requirements can lead to mold if ventilation is poor, balance humidity with adequate airflow, Small size makes escape prevention critical, use fine mesh barriers and tight-fitting lids, Colonies are slow-growing and small, beginners may lose patience with their slow development, Wild-caught colonies may carry parasites like tapeworms (Anomotaenia brevis) that can affect colony health ^[13], Test tube setups can flood if water reservoirs are too large, use appropriate-sized tubes for these tiny ants

Housing and Nest Setup

Temnothorax nylanderi thrives in tiny, humid cavities that mimic their natural nest sites in acorns and hollow twigs. Test tube setups work excellently, use small-diameter tubes (10-12mm) with a water reservoir at one end secured with cotton. The ants will cluster in the dark, humid end. Alternatively, Y-tong (AAC) nests with narrow chambers or custom acrylic nests scaled to their 2-3mm size work well. Natural setups using hollowed acorns or small twigs can be visually appealing but are harder to maintain. Place the nest in a dark area of your setup, as these forest ants prefer dim conditions. An outworld for foraging should include a shallow water source and small prey items. ^[1][2]

Feeding and Diet

These ants are generalist feeders with a preference for protein. In captivity, they readily accept small live prey like fruit flies, springtails, and tiny crickets. They also consume sugar water, honey, or diluted maple syrup, workers will carry these back to the colony. In the wild, they forage for small insects and opportunistically collect honeydew ^[9]. Feed them small prey items 2-3 times per week, removing any uneaten prey after 24 hours. Keep a constant supply of sugar water. Because of their tiny size, prey items should be appropriately sized, fruit flies and pinhead crickets are ideal.

Temperature and Seasonal Care

Temnothorax nylanderi prefers cooler temperatures than most ant species kept in captivity. Keep them at 18-22°C, ideally around 20°C. They naturally inhabit shaded forest floors and are sensitive to heat and dryness. During winter (November-March), they require a hibernation period at 5-10°C, this is essential for colony health and triggers spring breeding. Place the colony in an unheated room or refrigerator (not freezer) during diapause. Keep the setup dark during hibernation and ensure the nest doesn't dry out completely. Spring colonies tolerate environmental stressors like cadmium better than winter colonies, suggesting seasonal timing matters for any experiments or stress exposure ^[10].

Colony Dynamics and Behavior

This species exhibits fascinating social behaviors including tandem running recruitment, where a forager physically leads a nestmate to food ^[4]. The success rate of tandem runs improves dramatically with experience, from 67% on first attempts to over 90% after several visits ^[4]. Colonies can contain intercastes (intermediate forms between workers and queens), which is unusual in ants ^[11]. They show the 'dear enemy' phenomenon, reducing aggression toward familiar neighboring colonies ^[12]. Colonies readily relocate when disturbed and can fuse with neighboring colonies, which may be an adaptation to limited nest sites in forest habitats. Workers have an average lifespan of several months, while queens can live up to 15 years ^[1].

Reproduction and Nuptial Flights

Nuptial flights occur during summer, typically June through August, triggered by increasing morning light ^[1]. Males and winged queens emerge from colonies and mate during these flights. After mating, newly fertilized queens seek out small cavities, hollow twigs, acorns, or bark crevices, to establish new colonies. The founding queen seals herself in and overwinters alone before beginning egg-laying in spring ^[1]. First-year colonies produce only a handful of workers, it takes approximately 5 years for a colony to reach 100 workers. Colonies are strictly monogynous (single queen) but can occasionally adopt additional queens through colony fusion.

Health and Parasites

Temnothorax nylanderi can be parasitized by the tapeworm Anomotaenia brevis, which dramatically affects infected workers, they turn yellow, become less active, and live significantly longer (up to 842 days vs. 254 days for healthy foragers) ^[13]. This parasite manipulates host behavior to increase transmission to bird predators. Infected colonies show reduced overall aggression. The fungus Myrmicinosporidium durum has also been recorded in Italian populations ^[14]. When collecting wild colonies, watch for unusually yellow workers, this may indicate parasitism. Despite infections, colonies can persist for years, and parasitized workers often receive more care from nestmates ^[15].

Frequently Asked Questions

References