Strongylognathus karawajewi

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Native to Crimea, Transcaucasia, Kazakhstan, Central Asia, Armenia, Bulgaria, Greece, and Türkiye ^[2][4]. Inhabits extremely xerothermic (hot and dry) sites at altitudes below 660m, including steppe-like calcareous ridges in the Thracian plain and southern foothills of mountain ranges ^[3].
• Colony Type: Permanent social parasite (inquiline), lives permanently in host Tetramorium colonies. Queen-tolerant inquilinism means the parasite queen coexists with the host queen ^[5][6]. The parasite colony produces its own workers rather than relying on host workers.
• Size & Growth:
  • Queen: No data available
  • Worker: 2.2-2.6mm ^[1]
  • Colony: Unknown, likely small (few workers relative to reproductives) ^[3]
  • Growth: Slow
  • Development: Unknown, no specific data available (Development likely similar to host Tetramorium species (6-10 weeks at optimal temperature))
• Antkeeping:
  • Temperature: Keep at 22-26°C, they naturally occur in warm, xerothermic habitats ^[3]. Provide a temperature gradient allowing them to move between warmer and cooler areas.
  • Humidity: Low to moderate, they inhabit dry, steppe-like environments. Keep the nest relatively dry with some moisture areas available. ^[3]
  • Diapause: Likely, based on temperate distribution and host species behavior. Provide a cool period (10-15°C) during winter months.
  • Nesting: Must be kept with a host Tetramorium colony. A naturalistic setup with both species or a divided formicarium allowing host-parasite interaction works best. They cannot survive without their host species. ^[3]
• Behavior: Generally peaceful and non-aggressive, as they rely on host acceptance. They do not raid or conduct slave raids like some related species, instead they integrate peacefully into the host colony ^[5]. Workers are small at 2.2-2.6mm ^[1] and relatively inactive. Escape risk is low due to their small size but they can still climb smooth surfaces. They are primarily nest-dwelling and rarely forage in the open. Defense: smear venom using a flattened stinger (subfamily Myrmicinae, tribe Crematogastrini).
• Common Issues: host colony requirement is the biggest challenge, you must keep both the parasite and a healthy Tetramorium host colony., without a host colony, S. karawajewi cannot survive as they depend on host workers for nest maintenance and foraging., finding a proper host species (T. hungaricum, T. caespitum, T. chefketi) can be difficult outside their natural range., colonies remain small and slow-growing due to inquiline lifestyle., this species is listed as Vulnerable D2 on the IUCN Red List ^[3][7], captive breeding should be done responsibly, and wild collection may be illegal in some countries.

Understanding Strongylognathus karawajewi as a Social Parasite

Strongylognathus karawajewi is a permanent social parasite, meaning it cannot establish its own colony and must live within a host Tetramorium colony throughout its entire life cycle ^[5]. This is different from temporary parasites that only use host workers temporarily. As a queen-tolerant inquiline, the parasite queen is accepted by the host colony and lives alongside the host queen, with both laying eggs ^[6].

The host workers care for the parasite brood as if it were their own, and both species coexist peacefully within the same nest. The parasite colony produces its own workers, which are smaller than host workers, creating a mixed workforce ^[3].

Known host species include Tetramorium caespitum, T. hungaricum, T. chefketi, T. ferox, T. inerme, and T. sulcinode ^[3][4]. In Bulgaria, S. karawajewi has been found primarily in nests of T. hungaricum and T. chefketi at elevations below 660m ^[3]. This species evolved from slave-making ancestors through a degeneration of raiding behavior ^[5].

Housing and Nest Setup

Keeping S. karawajewi requires keeping TWO colonies: the parasite and a healthy host Tetramorium colony. This is the fundamental challenge in cultivating this species. You cannot keep S. karawajewi alone, they will not survive.

The best approach is a naturalistic or formicarium setup that houses both species in proximity, either in a divided nest or in separate nests connected by tubing. The host colony handles all foraging and nest maintenance, while the parasite colony lives within or adjacent to the host nest. Some keepers successfully maintain them in a single large naturalistic setup with multiple chambers housing both species.

The nest should be kept warm (22-26°C) and relatively dry, matching their xerothermic natural habitat ^[3]. A small water tube for moisture is sufficient, avoid overly damp conditions. Provide a temperature gradient so both colonies can regulate their preferred conditions.

Feeding the Colony

The host Tetramorium colony does all the foraging, so the parasite colony relies on whatever the host workers bring back. In captivity, you should feed the host colony directly. Tetramorium species are generalist foragers that accept proteins (dead insects, mealworms), sugars (honey water, sugar water), and seeds.

Feed the host colony small amounts of protein 2-3 times per week and provide a constant sugar source. The host workers will share food with the parasite colony through trophallaxis (mouth-to-mouth food sharing), which is how the parasites get their nutrition. Do not expect to see S. karawajewi workers foraging actively, they are primarily nest-dwelling and rely on host workers for food.

Temperature and Seasonal Care

S. karawajewi naturally inhabits warm, dry habitats in the Mediterranean and Central Asian regions. Keep the nest at 22-26°C, with a slight gradient if possible ^[3]. They can tolerate higher temperatures briefly but should not be exposed to temperatures below 15°C for extended periods.

Based on their temperate distribution and the behavior of related species, they likely require a winter diapause period. During winter (roughly November to March in the Northern Hemisphere), reduce temperatures to 10-15°C and reduce feeding. Do not feed during the cold period. The host colony will also slow down during this time, which is natural.

Behavior and Interactions

Unlike their close relatives in the testaceus group that engage in slave-making (dulosis), S. karawajewi is a peaceful inquiline that does not raid other colonies ^[5]. The parasite queen is accepted by the host colony through a process that is not fully understood, she is not attacked or killed, and instead integrates into the social structure.

Workers of S. karawajewi are smaller than host workers and are rarely seen outside the nest area. They are not aggressive and cannot defend themselves against threats. The host colony provides all nest protection and territory defense. This means your main concern is keeping the host colony healthy, if the host dies, the parasites will not survive.

Frequently Asked Questions

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References