Temnothorax algerianus

Temnothorax algerianus

Temnothorax algerianus is a small parasitic ant native to North Africa (Morocco and Algeria) with recent records in southern Spain near Hornos village ^[1]. Workers are tiny, measuring approximately 3-4mm with distinctive short petiolar hairs (85-130μm) that help distinguish them from similar species like T. kraussei and T. ravouxi ^[1]. The species has a dark reddish-brown coloration typical of the genus. This ant is an obligate slave-maker, it cannot survive without a host colony of other Temnothorax species, most commonly Temnothorax spinosus ^[1]. The queens invade host nests, kill the host queen, and are then accepted by the host workers as replacement reproductives ^[2].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Mediterranean and North African regions, found in Morocco, Algeria, and southern Spain. Inhabits dry, rocky habitats with sparse vegetation where host species nest ^[1][2].
• Colony Type: Polygynous (multiple queens) in most populations, though monogynous and functionally monogynous colonies also occur. Multiple reproductive queens may be present in slavemaker colonies ^[3][2].
  • Colony: Optionally polygyne
  • Queen: Socially parasitic
  • Special: Slave-making
• Size & Growth:
  • Queen: Approximately 4-5mm (estimated from gyne cephalic size data of 615±18μm) ^[1]
  • Worker: Approximately 3-4mm (estimated from worker cephalic size data of 598±21μm) ^[1]
  • Colony: Colony size data limited, parasitic species typically maintain smaller colonies than their hosts ^[3]
  • Growth: Moderate, growth depends on host colony success
  • Development: Unknown, directly tied to host colony development (Development is linked to host species (T. spinosus) development timeline)
• Antkeeping:
  • Temperature: Keep at 20-24°C, Mediterranean species preferring warm, stable conditions. A gentle gradient allows thermoregulation ^[2].
  • Humidity: Moderate humidity (50-60%), dry Mediterranean climate. Provide a water tube but allow portions of the nest to dry between mistings ^[2].
  • Diapause: Yes, queens may leave mother colonies in fall, winter, or spring, suggesting seasonal dormancy at lower temperatures ^[2]. Provide a cool period (10-15°C) during winter months.
  • Nesting: Requires a host colony to function. Best kept in a setup that allows interaction between parasite and host. Y-tong or acrylic nests work well for observation. Must include both parasite and host chambers ^[2].
• Behavior: Temnothorax algerianus is an active slave-maker. Workers conduct raids on neighboring host nests to steal brood, which then emerge as host workers that serve the parasite colony ^[2]. Queens exhibit agonistic behavior toward each other in polygynous colonies, this aggression helps determine whether young queens stay or leave to found new colonies ^[2]. Workers are small but active foragers. Escape risk is moderate due to their small size, use standard barrier methods ^[2].
• Common Issues: Host dependency is the primary challenge, without a healthy host colony, the parasite colony cannot survive, Colony failure often occurs if the host queen is not properly replaced or if host workers reject the parasite queen, Keeping both parasite and host alive requires careful balance, overpopulation of parasites can collapse the host colony, Small size means escapes are possible through standard barriers, use fine mesh and check connections regularly, Finding and maintaining a proper host species (T. spinosus or similar) is difficult and expensive

Understanding the Parasitic Lifestyle

Temnothorax algerianus is an obligate social parasite, it cannot survive without a host colony. This makes it fundamentally different from most ant species kept in captivity. The queen must invade an established colony of a host species (typically Temnothorax spinosus) and kill the host queen through strangulation ^[1]. Once the host queen is dead, the parasite queen is accepted by the host workers as their new reproductive, effectively taking over the colony ^[2]. The host workers continue their normal duties (foraging, brood care, nest maintenance) while the parasite queen lays eggs. Worker ants of T. algerianus then conduct slave raids on neighboring host colonies, stealing pupae that emerge as additional host workers ^[2]. This relationship is permanent, the parasite colony cannot survive without its host. You must maintain both species for success.

Housing and Colony Setup

Keeping T. algerianus requires a dual-colony setup, you need both the parasite and a healthy host colony. The simplest approach is to obtain an already-established mixed colony containing both species. If starting from scratch, you would need to introduce a mated parasite queen to a host colony, which is challenging and often fails. For housing, use a Y-tong (AAC) or acrylic formicarium that allows you to observe both the parasite and host sections. Connect multiple outworlds if you want to simulate slave-raiding behavior. Temperature should be maintained at 20-24°C with a slight gradient. Humidity should be moderate (50-60%) with a water tube always available. The nest should have chambers sized appropriately for these tiny ants (3-4mm workers), tight spaces help them feel secure ^[2].

Feeding and Nutrition

Feed both the parasite and host workers separately. The host workers will forage for food and feed the entire colony, including the parasite individuals. Offer standard ant foods: sugar water/honey for energy, and protein sources like fruit flies, small crickets, or mealworms. Since host workers do the foraging, ensure food is accessible in the outworld. Feed every 2-3 days, removing uneaten food to prevent mold. Fresh water should always be available. The parasite workers will also feed directly when they encounter food in the outworld. Monitor feeding activity, active foraging indicates a healthy mixed colony ^[2].

Reproduction and Nuptial Flights

Reproduction in T. algerianus is unique among ants. Young queens mate inside the mother nest rather than during nuptial flights ^[2]. After mating, they have two options: remain in the mother colony as additional reproductive queens, or leave to found new colonies by invading other host nests. This departure happens over an unusually protracted period, fall, winter, or spring, at comparatively low temperatures ^[2]. In polygynous colonies, agonistic behavior between parasite queens has been observed and may determine which queens stay and which leave ^[2]. If you have a healthy established colony, you may eventually see new reproductives (both males and gynes) develop inside the nest.

Seasonal Care and Overwintering

Temnothorax algerianus experiences seasonal changes in activity. The mention of queen dispersal in fall, winter, and spring suggests they have a period of reduced activity during winter ^[2]. Provide a cool overwintering period of 10-15°C for 2-3 months during winter. During this time, reduce feeding frequency and allow the colony to slow down. Do not feed during hibernation. Ensure some moisture remains available, do not let the nest dry out completely. In spring, gradually increase temperature back to normal keeping temperatures. Watch for increased activity as the colony emerges from dormancy. This seasonal cycle helps maintain colony health and may trigger reproduction in established colonies ^[2].

Common Problems and Solutions

The biggest challenge with T. algerianus is their obligate parasitic lifestyle. If the host colony dies or is rejected, the parasite colony will also die, they cannot survive independently ^[3]. Host rejection of the parasite queen is a common failure point during colony establishment. Another issue is colony collapse when parasites outnumber hosts, the host workers cannot sustain the parasite population. To prevent this, maintain a balanced ratio and avoid disturbing the colony excessively. Escape is a moderate risk due to their small size, check all connections and use appropriate barriers. Finally, finding a proper host species can be difficult and expensive, as T. spinosus or similar hosts may not be readily available. Start with an established mixed colony if possible rather than attempting introduction ^[2].

Frequently Asked Questions

References