Lasius austriacus

Lasius austriacus

Lasius austriacus is an extremely small, almost completely subterranean ant species native to Central Europe. Workers measure just 0.7mm in body size, making them one of the smallest Lasius species in the Palaearctic region. They have notably reduced eyes, a clear adaptation to their underground lifestyle, and dark brown coloration with yellowish antennae and legs. This rare species inhabits hot, dry, rocky grasslands in Austria, Czech Republic, and Turkey, living almost exclusively underground where they tend to mealybugs for honeydew. The species was only described in 2003 and is closely related to the invasive garden ant Lasius neglectus ^[1][2].

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Central Europe (Austria, Czech Republic, Turkey). Inhabits xerothermous grassland with interspersed silicate rocks at elevations around 300-1900m. Lives almost exclusively underground in dry, rocky habitats ^[1][3][2].
• Colony Type: Monogyne (single queen) colonies. Hypothesized based on the absence of inseminated gynes found inside nests despite repeated sampling. Colonies contain approximately 1,000-10,000 workers ^[1].
  • Colony: Monogyne
• Size & Growth:
  • Queen: Medium size, exact measurements not specified in available literature ^[4]
  • Worker: 0.7mm (CS 705 ± 32 µm), one of the smallest Palaearctic Lasius species ^[2]
  • Colony: 1,000-10,000 workers ^[1]
  • Growth: Unknown, no development studies available
  • Development: Unknown, no direct measurements available. Based on typical Lasius patterns, expect 6-10 weeks at warm temperatures. (Development timeline has not been directly studied. Related Lasius species typically take 6-10 weeks from egg to worker at optimal temperatures.)
• Antkeeping:
  • Temperature: Keep at room temperature (18-24°C). This is a temperate species from Central Europe, so moderate temperatures are appropriate. Avoid extremes, they are adapted to stable underground conditions.
  • Humidity: Low to moderate. This species inhabits dry, xerothermic rocky grasslands and lives underground where humidity is stable but not high. Allow the nest to dry out between waterings rather than keeping it constantly moist.
  • Diapause: Likely yes. As a Central European temperate species, expect a winter rest period. Reduce temperature to around 10-15°C for 2-3 months during winter.
  • Nesting: Y-tong (AAC) or plaster nests work well for this tiny species. The key is providing narrow chambers and passages scaled to their minute size. Because they are subterranean, they prefer enclosed nest spaces with minimal light exposure. A small outworld is sufficient since workers rarely emerge.
• Behavior: Extremely reclusive and almost completely subterranean. Workers are never observed on the soil surface, in the herb layer, or on trees, they spend their entire lives underground. They are hypogaeic (ground-dwelling) foragers that maintain trophobiosis with mealybugs inside the nest. Workers show non-aggressive behavior toward conspecifics from different colonies. Escape risk is low for workers since they stay underground, but the tiny size means any that do escape could slip through standard barriers. Stinging behavior is unknown for this species, Lasius ants can sting but most are too small to penetrate human skin effectively.
• Common Issues: this species is nearly impossible to find in the antkeeping hobby, it was only described in 2003 and remains critically endangered in its native range, subterranean lifestyle makes them nearly invisible, you may not see workers outside the nest for months, they depend on mealybugs for honeydew in the wild, captive diet acceptance is completely unknown, slow growth and tiny size make them vulnerable to stress and starvation, habitat destruction threatens wild populations, never collect from the wild

Why This Species Is Challenging

Lasius austriacus is one of the most difficult ant species to keep because it was only described in 2003 and remains one of the rarest ants in Central Europe. There is almost no captive husbandry information available, no one has documented keeping this species in captivity. The biggest challenge is that these ants are almost completely subterranean. Workers never come to the soil surface, meaning they forage and move entirely underground. This makes observing your colony nearly impossible and makes feeding difficult since you cannot simply place food in an outworld and expect workers to find it. Additionally, they appear to depend heavily on trophobiosis with mealybugs in the wild, so their acceptance of artificial diets is completely unknown. This is a species for advanced antkeepers who want to study a species that has never been kept in captivity before ^[1].

Housing and Nest Setup

Because Lasius austriacus is almost completely subterranean, you need a nest setup that accommodates their underground lifestyle. A Y-tong (AAC) nest or plaster nest with very small chambers works best, the passages must be tiny to match their 0.7mm worker size. Keep the nest dark most of the time since they avoid light. Provide minimal outworld space since workers rarely emerge. If they do come to the surface, use fine mesh for barriers, their tiny size means they can escape through gaps that larger ants cannot. The nest should have some dry areas since this species inhabits dry, xerothermic rocky grasslands in the wild. Avoid keeping the nest constantly wet, allow it to partially dry between waterings ^[1][3].

Feeding Challenges

This is perhaps the biggest unknown for keeping Lasius austriacus. In the wild, they maintain trophobiosis with mealybugs (Euripersia europaea) inside their nests, the ants tend these scale insects and consume their honeydew. This is their primary food source in nature. It is completely unknown whether they will accept sugar water, honey, or other artificial sugar sources. Protein acceptance is also unstudied, they may be able to capture small prey underground, or they may rely entirely on the honeydew from their mealybug partners. If you can obtain mealybugs (a root-feeding species), keeping them in the nest alongside the ants might be necessary for survival. This represents a major husbandry challenge that would require experimentation ^[1][5].

Temperature and Seasonal Care

As a Central European species from Austria and Czech Republic, Lasius austriacus experiences cold winters and warm summers in its native habitat. Keep the colony at moderate room temperature (18-24°C), this matches the stable underground conditions they prefer. A heating cable on one side of the nest can create a temperature gradient if needed, but this species does not require high heat. For winter, provide a diapause period of 2-3 months at reduced temperatures (around 10-15°C). This mimics the seasonal cycle they would experience in their natural xerothermic grassland habitat. Do not keep them warm year-round, they likely need the winter rest period for colony health ^[1][3].

Conservation Status and Ethical Considerations

Lasius austriacus is critically endangered in its native range. It is classified as Category 1 (critically endangered) in Lower Austria and is known from only a handful of populations in Central Europe. The species inhabits extremely specialized xerothermic rocky habitats that are threatened by habitat destruction, scrub encroachment, and reforestation (particularly by black locust). Only a few populations exist in a 6,500 km² area. You should never collect this species from the wild, doing so would be ecologically damaging to an already imperiled species. If you ever obtain captive-bred stock, it would represent the first known successful captive breeding of this species. Always ensure any colony was captive-bred and never wild-collected ^[3][6][5].

Frequently Asked Questions

References