Lasius pallitarsis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: North America, boreal and cold-temperate forests from eastern Québec across Canada to southeastern Alaska, south to Massachusetts and through the mountains of California and the west ^[4][2]. Also found in Mexico (Chihuahua state) ^[5].
• Colony Type: Monogyne (single-queen colonies) with documented pleometrosis, multiple queens can found colonies together, influenced by queen condition and alate density ^[6][7].
• Size & Growth:
  • Queen: Size data unavailable for queens, inferred from Lasius genus as ~7-9 mm
  • Worker: 2.5-5.0 mm ^[1]
  • Colony: Up to several thousand workers, estimated based on typical Lasius colony sizes
  • Growth: Moderate
  • Development: Estimated 6-10 weeks at optimal temperatures, inferred from genus patterns (Development time varies with temperature, specific timing for this species not directly studied)
• Antkeeping:
  • Temperature: Keep cool, roughly 15-22°C, based on their boreal habitat and flight observations ^[8]. Avoid temperatures above 25°C.
  • Humidity: Keep nest substrate consistently moist but not waterlogged, reflecting their natural nesting in rotting wood and under stones ^[8][4].
  • Diapause: Yes, require a winter rest period of 3-4 months at 5-10°C, based on their temperate range and seasonal cycle ^[8].
  • Nesting: Prefers nesting in rotting wood, stumps, or under stones. In captivity, use Y-tong, plaster, or naturalistic setups with damp substrate ^[8][4].
• Behavior: Generally peaceful and non-aggressive. Workers forage for honeydew and small insects, and may forage at night ^[4]. They are disturbance specialists, adapting well to human-modified environments ^[9][10]. Their small size means escape risk is high, use fine mesh barriers.
• Common Issues: escape prevention is critical, workers are small and can squeeze through gaps, fungal parasites like Laboulbenia formicarum can infect colonies in humid conditions ^[12], colonies may fail if kept too warm, they prefer cooler temperatures, pleometrosis may lead to queen conflict if multiple queens are kept together, alates produced in summer/fall require adequate space in the nest

Nest Preferences

In the wild, Lasius pallitarsis nests in rotting logs, stumps, under stones, and in soil under debris. They prefer moist, shaded locations like forests, bogs, swamps, and marshes ^[8]. In New Mexico, they nest under stones, logs, cow manure, or in sandy soils ^[4]. For captivity, provide a nest that retains moisture, Y-tong, plaster, or naturalistic setups with damp substrate work well. Monitor moisture to avoid dryness or mold ^[8][4].

Feeding and Diet

Lasius pallitarsis is a generalist omnivore. It eats plant debris, small insects, and tends aphids for honeydew ^[4]. Workers carry dead insects to nests in the evening, and colonies accept honey and insects in labs ^[4]. Feed sugar water or honey regularly, plus protein like fruit flies or small mealworms.

Temperature and Seasonal Care

This boreal species prefers cooler temperatures. Keep nests at 15-22°C, avoiding above 25°C ^[8]. They require winter diapause at 5-10°C for 3-4 months. Nuptial flights occur in afternoon with dimming light and temperatures around 20-27°C ^[8].

Colony Founding and Growth

Colonies are monogyne, but pleometrosis occurs, multiple queens may found together ^[7]. Queen condition affects co-founding success ^[11]. Colony growth is moderate, egg to worker takes about 6-10 weeks at optimal temperatures. Mature colonies reach several thousand workers.

Health Concerns and Parasites

This species hosts fungal parasites like Laboulbenia formicarum and Aegeritella tuberculata in the USA ^[12]. These fungi form dark protuberances on the cuticle, reducing lifespan and activity. Maintain hygiene and avoid over-humid conditions to minimize risk ^[12].

Behavior and Temperament

Workers are peaceful, non-aggressive, and forage for honeydew and insects. They may forage at night ^[4]. Their small size (2.5-5.0 mm) means high escape risk, use fine mesh barriers. They are disturbance specialists, thriving in human-modified areas ^[9][10].

Frequently Asked Questions

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References