Temnothorax stumperi

Temnothorax stumperi

Temnothorax stumperi is a tiny but aggressive slave-maker ant native to the European Alps and surrounding mountains. Workers measure just 2.2mm and are yellow to yellow-brown with a darker head and a distinct dark band across their abdomen ^[1][2]. Despite their small size, these ants are fierce parasites, the queen invades nests of related Temnothorax species like T. nigriceps and T. tuberum, kills the host queen by biting her throat, and then uses the host workers to raise her own brood ^[3][4]. This is one of the most challenging ants to keep because it cannot survive without a host colony, you must maintain both the parasite and its host species in captivity.

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Montane species found in the Alps (Austria, Northern Italy, Switzerland), mountains of Türkiye, Peloponnese (Greece), and Pyrenees (Spain) at altitudes between 1000-2000m ^[5]. They live under small, flat stones in open alpine pastures, short-grass meadows, and light larch/pine stands ^[6].
• Colony Type: Single-queen colonies (monogynous), the parasite queen lives in the host nest and kills the host queen to take over ^[1][3]. This is a permanent social parasite that cannot survive without its host.
  • Colony: Monogyne
  • Queen: Socially parasitic
  • Special: Slave-making
• Size & Growth:
  • Queen: 2.2mm ^[2]
  • Worker: 2.2mm ^[1]
  • Colony: Small colonies, typically under 20 parasite workers plus host workers ^[3]
  • Growth: Slow
  • Development: Unknown, development has not been directly studied in this species (As a social parasite, development occurs within the host colony using host worker resources)
• Antkeeping:
  • Temperature: Keep at cool mountain temperatures, around 15-20°C. This species naturally occurs at high altitudes where conditions are cool ^[7][6]. Avoid warm conditions.
  • Humidity: Moderate humidity. They naturally live under stones in alpine meadows, so keep substrate slightly moist but not wet.
  • Diapause: Yes, as a montane species, they likely require winter hibernation at cool temperatures (5-10°C) for several months ^[7].
  • Nesting: This species cannot be kept alone. You must establish and maintain a host colony (Temnothorax nigriceps, T. tuberum, or T. unifasciatus) first, then introduce the parasite queen to the host nest. Natural nests are under flat stones in open terrain.
• Behavior: Aggressive slave-maker. The parasite queen enters a host nest, kills the host queen, and uses the host workers to care for her brood. Workers are small (2.2mm) but actively conduct raids to steal more brood from nearby host colonies ^[3]. They have functional stingers but rarely use them given their small size. Escape risk is moderate, they're tiny but not particularly agile.
• Common Issues: establishing a host colony is difficult, host species must be collected from the same geographic area, introducing the parasite queen to the host colony often fails, the host workers may kill her, keeping both species alive requires precise temperature and humidity matching, this species cannot be kept long-term without a viable host colony, diapause requirements are strict, improper hibernation kills both parasite and host

The Challenge of Keeping a Slave-Maker

Temnothorax stumperi is one of the most difficult ants to keep because it is an obligate social parasite, it cannot survive without a host colony. Unlike most ants where you start with a founding queen and raise her workers, here you must first establish a healthy colony of a suitable host species (Temnothorax nigriceps, T. tuberum, or T. unifasciatus) ^[3][4]. Only then can you attempt to introduce the parasite queen. The parasite queen kills the host queen by biting her throat, then uses the host workers to raise her own brood ^[3]. This means you are essentially running two ant colonies simultaneously, and both must thrive.

Host Colony Requirements

You need to collect and maintain a host colony before acquiring T. stumperi. The best hosts are Temnothorax nigriceps (found in 11 of 20 samples) or T. tuberum (found in 2 samples) ^[4]. These are small (2-3mm), peaceful ants that nest under stones in similar alpine habitats. Keep the host colony in a small nest (test tube or Y-tong) at 15-20°C with moderate humidity. Feed them small insects and sugar water. The host colony should be well-established with at least 20-30 workers before introducing the parasite.

Introducing the Parasite

Introducing the parasite queen to a host colony is tricky and often fails. The host workers may recognize the intruder and attack her. Some keepers report success by placing the parasite queen in a separate container with some host workers and brood, allowing her to establish some scent before combining colonies. The parasite queen must kill the host queen to take over the nest, this is their natural behavior ^[3]. If successful, the parasite queen will lay eggs and the host workers will raise them. Expect high failure rates, this is not a species for beginners.

Temperature and Seasonal Care

As a montane species from high altitudes (1000-2000m), T. stumperi prefers cool temperatures around 15-20°C ^[7][6]. Avoid warm conditions, they naturally live in cold alpine environments. During winter, both the parasite and host colonies require a proper hibernation period at 5-10°C for 3-4 months ^[7]. This mimics the natural winter conditions in the Alps. Keep them in a cool basement, garage, or refrigerator during this time. Both species must hibernate together.

Feeding and Nutrition

Once established within the host colony, T. stumperi workers will forage alongside the host workers. They eat small insects (fruit flies, pinhead crickets, springtails) and likely also honeydew from aphids. The host workers do the foraging, so the parasite benefits from their labor. Feed the colony small prey items twice weekly. Sugar water can be offered occasionally, though acceptance varies.

Natural History and Defense

In the wild, T. stumperi queens conduct what are called 'mating flights', alates (winged reproductives) leave the nest to mate and found new colonies ^[1]. After mating, new queens seek out host nests to parasitize. The species is known to have diploid males, which occurs when fertilized females produce males from fertilized eggs, this is unusual in ants and indicates unusual sex determination ^[6]. Workers are small (2.2mm) but will defend the nest aggressively if threatened.

Frequently Asked Questions

References