Myrmica curvithorax

Myrmica curvithorax

Myrmica curvithorax is a small to medium-sized Myrmica ant native to grasslands across Central and Eastern Europe, extending into West Siberia and Kazakhstan. Workers measure around 4-6mm with the characteristic reddish-brown coloration typical of many Myrmica species. This species belongs to the specioides complex and is distinguished by its very narrow frons (the area between the eyes). Colonies are typically monogyne (single-queen) and can grow to around 800 workers. The species has a complicated taxonomic history, it was previously known as Myrmica curvithorax and was long confused with M. salina in central Europe ^[1][2].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Grasslands of Central and Eastern Europe, from Germany and Spain east to West Siberia and Kazakhstan. In central Europe it inhabits dry meadows, while in its eastern range it prefers wet, often salted habitats in steppe zones. It thrives in habitats with extreme moisture and temperature fluctuations and is a specialist for grassland habitats ^[3][1][4][5].
• Colony Type: Monogyne (single-queen) colonies with up to 800 workers. Colonies typically have one queen ^[1][6].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 5-7mm based on genus typical size
  • Worker: 4-6mm ^[3]
  • Colony: Up to 800 workers ^[1]
  • Growth: Moderate, typical for Myrmica species
  • Development: 6-10 weeks at optimal temperature (estimated based on related Myrmica species) (Development time follows typical Myrmica patterns, expect several weeks from egg to first worker at room temperature)
• Antkeeping:
  • Temperature: Keep at 20-24°C. This is a warmth-loving (thermophilous) species that benefits from moderate heating. A gradient allowing workers to choose their preferred temperature works best ^[7].
  • Humidity: Moderate to high. In nature they inhabit both dry meadows and wet salted habitats, so they tolerate a range. Keep nest substrate moist but not waterlogged, with some drier areas available.
  • Diapause: Yes, as a temperate species, colonies require a winter rest period. Reduce temperature to 5-10°C for 2-3 months during winter.
  • Nesting: Soil-nesting species that builds nests directly into the ground. In captivity, a naturalistic setup with soil or a Y-tong/plaster nest with moist substrate works well. They prefer nests with good moisture retention.
• Behavior: Generally non-aggressive but will defend the nest if threatened. Workers are active foragers that search for food both on the ground and in low vegetation. Like most Myrmica, they have a functional stinger but rarely sting unless handled roughly. They are moderate escape artists, ensure enclosures have secure barriers. They are grassland specialists and do well in setups that mimic their natural meadow habitat.
• Common Issues: colonies may fail if kept too dry, they need consistent substrate moisture, winter diapause is essential, skipping hibernation weakens colonies over time, confusion with similar species means wild-caught specimens may be misidentified, parasitic fungi (Rickia wasmannii) can infect colonies, avoid introducing wild ants to established colonies, slow growth compared to tropical species requires patience, don't overfeed or disturb founding colonies

Housing and Nest Setup

Myrmica curvithorax is a soil-nesting species that builds nests directly into the ground. In captivity, you can keep them in a naturalistic setup with a soil-filled container, or use a Y-tong (acrylic) nest or plaster nest with moist substrate. Because they are grassland specialists, they do well in setups that mimic their natural habitat, a layer of soil or sand mixed with some organic material works well. The nest should retain moisture well since they inhabit areas with varying humidity. A test tube setup can work for founding colonies, but established colonies do better in larger naturalistic setups where they can create proper tunnel systems. Ensure your setup has good escape prevention, while not extreme escape artists, Myrmica workers can climb smooth surfaces. ^[1][3]

Feeding and Diet

Like other Myrmica species, Myrmica curvithorax is omnivorous. Workers collect honeydew from aphids and other sap-sucking insects in the wild, and they also hunt small invertebrates. In captivity, offer a mix of protein and carbohydrate sources. Protein options include small insects like fruit flies, small crickets, and mealworms. For carbohydrates, provide sugar water, honey, or diluted honey water. They typically forage on the ground and up into low vegetation, so place food where workers can easily find it. Feed protein sources 2-3 times per week and keep a constant sugar water supply. Remove uneaten prey after 24 hours to prevent mold.

Temperature and Seasonal Care

This is a warmth-loving (thermophilous) species that does best at temperatures between 20-24°C. They can tolerate cooler temperatures since they naturally occur in temperate regions, but growth and activity are optimal in this range. During summer, room temperature is usually sufficient. In winter, colonies require a diapause (hibernation) period of 2-3 months at temperatures around 5-10°C. This is essential for colony health, skipping hibernation will weaken the colony over time and may prevent proper brood development. You can achieve this by moving the colony to a cool basement, garage, or refrigerator (not freezer) during winter. Reduce feeding during diapause but do not let the nest dry out completely. ^[7][4]

Colony Development and Growth

Myrmica curvithorax colonies grow at a moderate pace typical of temperate Myrmica species. Founding queens are claustral, they seal themselves in a chamber and raise their first workers alone using stored fat reserves. The first workers (nanitics) are typically smaller than normal workers. Expect 6-10 weeks from egg to first worker at optimal temperatures. Established colonies can reach up to 800 workers ^[1]. Growth is slower than tropical species, so patience is required, don't disturb founding colonies or overfeed them. Once established, colonies are fairly resilient but do best with consistent care and proper seasonal cycles.

Behavior and Temperament

Workers of Myrmica curvithorax are active foragers that search for food both on the ground and in low vegetation. They are not particularly aggressive but will defend their nest if threatened. Like most Myrmica species, they have a functional stinger but rarely use it unless handled roughly or when the nest is directly disturbed. They are moderate escape artists, while not as problematic as some tiny species, they can climb smooth surfaces, so ensure your setup has secure barriers. They do well in groups and the single-queen colony structure means you won't have to deal with queen conflicts. Their grassland habitat preference means they do best with some vertical space to explore and forage.

Common Problems and Health

The main issues keepers face with this species relate to improper seasonal care and humidity management. Because they naturally inhabit habitats with moisture fluctuations, they need consistent substrate moisture, too dry and brood will fail to develop. The winter diapause is essential, colonies that are kept active year-round often decline. This species can also be infected by the parasitic fungus Rickia wasmannii, which has been documented in Czech Republic, Hungary, and Romania ^[8][9]. Avoid introducing wild-caught ants to established colonies, as this is a common transmission vector. Finally, be aware of identification confusion, this species was long misidentified as M. salina in central Europe, so if you obtain wild-caught specimens, verify the identification.

Frequently Asked Questions

References