Temnothorax ravouxi

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Western Palearctic: from Spain and France through central Europe to Turkey and Georgia. Lives in thermophilic, dry, sunny areas like light pine-oak forests, rocky slopes, and abandoned vineyards ^[3][7].
• Colony Type: Monogyne, each colony has a single parasitic queen that permanently replaces the host queen ^[8]. Colonies contain both parasite workers (typically 1-77,average 23) and host workers (typically 4-514,average 138) ^[8].
• Size & Growth:
  • Queen: 2.5-3.5 mm ^[3]
  • Worker: 2-3 mm ^[3]
  • Colony: Up to 400 workers total (combined parasite and host workers) ^[3]
  • Growth: Slow
  • Development: Unknown, brood development is seasonal, with larvae hibernating before emerging as adults the following spring ^[3]. (Sexual larvae hibernate in the nest, then pupate and emerge in early summer ^[3][5].)
• Antkeeping:
  • Temperature: Keep at room temperature (20-24°C). As a Mediterranean species, they do well with typical indoor warmth ^[3].
  • Humidity: Low to moderate, they live in dry, sunny habitats. Keep the nest substrate mostly dry, with only a slightly moist area if needed ^[3].
  • Diapause: Yes, sexual larvae need a cool winter period (10-15°C) to finish development ^[3][5].
  • Nesting: Small formicarium or test tube setup. In nature they nest in dead branches, under stones, or in hollow twigs, small cavities are essential ^[3]. Use materials scaled to their tiny size.
• Behavior: T. ravouxi is an active slave-maker. Workers conduct organized raids using pheromone trails and their venomous sting, which they aim at the head or gaster of defending host ants ^[3][9]. They steal pupae and large larvae. The queen kills the host queen by slowly throttling her with her mandibles over days or weeks ^[5][6]. Parasite workers are not aggressive to humans but will sting if handled. Escape prevention is critical due to their very small size.
• Common Issues: requires a healthy host colony, without host workers, the parasite colony cannot survive, difficult colony foundation, the queen must successfully usurp an existing host colony, which often fails, slow colony growth and small maximum size, death of host workers will kill the colony, legally protected in many European countries (IUCN Vulnerable, national red lists), do not collect from the wild ^[12][13]

Understanding T. ravouxi as a Slave‑Maker

Temnothorax ravouxi is an obligate social parasite, it cannot survive without a host colony of other Temnothorax ants ^[5]. This makes it completely different from most ant species in captivity. The species is monogyne, meaning each colony has exactly one parasitic queen that lives permanently in the usurped host nest ^[8]. She does not found a colony independently like typical ants. After mating during nuptial flights in late August-September ^[3], the fertilized queen searches for a host colony. She enters the nest and slowly kills the resident queen by throttling, grasping around the neck or throat with her mandibles and squeezing over days or weeks ^[5][6]. Amazingly, the host workers then accept the parasite queen as their own. The parasite colony then relies entirely on host workers for foraging, brood care, and nest maintenance, the parasite workers themselves are relatively inactive and have a limited behavioral repertoire ^[3]. This arrangement is permanent, not temporary.

Host Species Requirements

T. ravouxi parasitizes several Temnothorax species, but shows a strong preference for Temnothorax unifasciatus in western Europe (found in 40 of 76 samples in one study) ^[1]. Other recorded hosts include T. affinis, T. nigriceps, T. albipennis, T. tuberum, T. crasecundus, T. nadigi, T. lichtensteini, T. corticalis, T. jailensis, and T. turcicus ^[1][10]. In captivity you must maintain both the parasite and a host species at the same time. The host colony provides all essential functions, foraging, brood care, nest maintenance, while parasite workers focus mainly on raiding ^[3]. Without a healthy host worker population, the parasite colony cannot survive. That makes T. ravouxi one of the most challenging ants to keep, because you are essentially running two colonies in one setup.

Slave Raids and Colony Expansion

The most notable behavior of T. ravouxi is its organized slave raids. A few scout workers search for nearby Temnothorax colonies. When a scout finds a target, she lays a short‑lived pheromone trail from her poison gland, leading a group of parasite workers to the host nest ^[9]. The raid usually involves several dozen workers traveling just a few meters, the maximum distance is about 3 m ^[9]. During the raid, parasite workers fight defending host workers using their venomous sting, targeting the head or between gastral segments ^[3]. Their venom is effective and quickly subdues defenders. Once inside, they steal pupae and large larvae and carry them back to their nest ^[9]. These stolen pupae eclose as host workers, the 'slaves' that will then work for the parasite colony. Male pupae are consumed, while female pupae and any newly hatched parasite queens have their wings bitten off to keep them as workers ^[11]. Raiding typically happens in early summer (June-July) when parasite workers mature ^[3].

Housing and Care

Keeping T. ravouxi means maintaining both the parasite and a host species. Use a small formicarium or test tube setup scaled to their tiny 2-3 mm workers. The nesting area should be dark and small, in nature they use dead branches, under stones, or hollow twigs ^[3]. Keep temperature around room level (20-24°C) ^[3]. Humidity should be low to moderate, reflecting their preference for dry, sunny sites, the nest substrate should be mostly dry, with only a slightly damp area if needed. Provide a winter diapause at 10-15°C, because sexual larvae hibernate before pupating ^[5]. The most critical care aspect is maintaining a healthy host colony, the host workers do all the foraging and brood care. Feed the host colony typical ant foods (sugar water, small insects). Escape prevention is vital due to their very small size, use fine mesh barriers. This species is Vulnerable on the IUCN Red List and protected in several European countries, do not collect from the wild ^[12][13][14]. Captive breeding is extremely difficult.

Legal and Ethical Considerations

T. ravouxi is listed as Vulnerable (VU D2) on the IUCN Red List ^[12][14] and is critically endangered in several countries, including Austria (Carinthia) and Germany (Bavaria) ^[15][13]. It is fully protected in Carinthia, Austria ^[13] and included in various national red lists across its range. This species must not be collected from the wild. Captive breeding is exceptionally difficult because of its obligate parasitic relationship with host ants. For these reasons, T. ravouxi is NOT suitable for beginner antkeepers, it is an expert‑level species that requires deep knowledge of both parasite and host biology. If you encounter this species in the wild, observe and photograph it but leave it undisturbed. The best way to appreciate this fascinating ant is through field observation or by following research literature.

Frequently Asked Questions

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References