Lasius himalayanus

Lasius himalayanus

Lasius himalayanus is a small, dark ant species native to the Himalayan region. Workers measure 3-3.5mm and have a distinctive appearance with a dark brown head and mesosoma, blackish brown gaster (abdomen), and yellowish-brown mandibles, clypeus, antennae, and legs. They belong to the brunneus species complex and are most similar to Lasius brunneus, but can be identified by their narrower head and longer scape (the antennae 'handle'). This is a high-altitude species found in the Himalayas at elevations between 2300-2800 meters, making it one of the more cold-tolerant Lasius species available in the antkeeping hobby.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Himalayan region, found in India, Pakistan, and China (Yunnan Province) at high elevations of 2300-2800 meters. They inhabit mountainous areas with moderate rainfall and are typically found on the ground in natural habitats ^[1][2].
• Colony Type: Likely single-queen (monogyne) colonies based on typical Lasius genus patterns. No specific colony size data exists for this species, but related Lasius species typically form colonies of several hundred workers.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Not specifically documented, estimated 7-9mm based on related Lasius species
  • Worker: 3-3.5mm ^[1]
  • Colony: Unknown, estimated several hundred workers based on related species
  • Growth: Moderate, typical for Lasius genus
  • Development: 6-10 weeks, estimated based on related Lasius species at optimal temperature (Development time is temperature-dependent, cooler high-altitude conditions may extend this timeline)
• Antkeeping:
  • Temperature: Keep cool, around 18-22°C. This is a high-altitude Himalayan species that prefers cooler conditions than typical room temperature. Avoid overheating. A room-temperature setup (around 20°C) is ideal, with no additional heating needed in most homes.
  • Humidity: Moderate humidity around 50-60%. They come from a temperate Himalayan climate with moderate rainfall. Keep the nest substrate lightly moist but not waterlogged. Allow some drying between waterings.
  • Diapause: Yes, required. As a Himalayan high-altitude species, they need a winter hibernation period. Reduce temperature to 5-10°C for 3-4 months during winter (roughly October to March in the Northern Hemisphere).
  • Nesting: Ground-nesting species. They do well in test tube setups for founding colonies, then can be moved to Y-tong (AAC), plaster, or naturalistic setups with soil. Provide a layer of moist substrate for workers to dig in.
• Behavior: Generally calm and non-aggressive. Like other Lasius species, they are not particularly territorial and tend to focus on honeydew collection and small prey. Workers are active foragers but not particularly aggressive toward humans. They have no stingers and pose no danger to keepers. Their small size (3mm) means escape prevention is important, they can squeeze through small gaps.
• Common Issues: high altitude cold requirements, they may struggle in warm rooms above 24°C, escape prevention is critical due to their tiny 3mm size, hibernation is mandatory, colonies that don't cool down properly may fail to thrive, slow colony growth compared to tropical species can frustrate beginners, limited availability in the antkeeping hobby, this is a rarely kept species

Housing and Nest Setup

For founding colonies, a simple test tube setup works well. Fill a test tube one-third with water, plug with a cotton ball, then add the queen. Place it in a dark, quiet location and wait for eggs to appear. Once the colony reaches 20-30 workers, you can transition to a proper formicarium. Y-tong (AAC) nests work well because they allow you to control humidity precisely. You can also use plaster nests or naturalistic setups with a soil layer. Whatever setup you choose, ensure it has a water source, either a water tube attached to the nest or moist substrate. ^[1][2]

Feeding and Diet

Like other Lasius species, L. himalayanus is omnivorous. They primarily collect honeydew from aphids and other small insects. In captivity, offer sugar water or honey water as a constant energy source. For protein, provide small insects like fruit flies, pinhead crickets, or mealworms. Feed protein 2-3 times per week, and keep sugar water available at all times. Remove any uneaten prey after 24-48 hours to prevent mold.

Temperature and Seasonal Care

This is the most critical aspect of keeping Lasius himalayanus. Being a high-altitude Himalayan species, they prefer cool conditions. Keep the nest at 18-22°C, room temperature in most homes is ideal. Avoid placing the colony near heat sources or in direct sunlight. During winter, you must provide a hibernation period. Reduce temperature to 5-10°C (a garage or unheated room works well) for 3-4 months. This mimics their natural high-altitude environment and is essential for colony health and reproduction. ^[1]

Behavior and Colony Dynamics

Lasius himalayanus workers are active foragers that search for honeydew and small prey. They are not aggressive and handle gently. Colonies grow at a moderate pace, don't expect the rapid growth seen in tropical species. The first workers (nanitics) will be smaller than mature workers. This species is not well-studied in captivity, so expect some trial and error as you learn what works for your colony. Watch for signs of stress like workers clustering at the coolest part of the nest or avoiding food. ^[1]

Frequently Asked Questions

References