Lasius chinensis

Lasius chinensis

Lasius chinensis is a medium-sized ant native to northeastern China, first described by Seifert in 2020. Workers measure around 3.5-4mm and have a dark to blackish brown coloration with paler yellowish tinges on the antennal funiculus, leg joints, and anterior clypeal border. This species is characterized by very numerous and long standing setae (hairs) across all body parts, which distinguishes it from its close relative Lasius japonicus. It occupies a niche comparable to Lasius niger, being a highly adaptable 'eurypotent' species found in diverse habitats from river banks and open forests to urban parks and even concrete-sealed city centers ^[1]. This is a western parapatric sibling species of L. japonicus, with their contact zone spanning between 116-117°E from Beijing south to Shandong ^[1].

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Northeastern China, from eastern Qinghai (36.6°N,101.7°E) east to Shandong (36.4°N,117.4°E), with the most southern record in Chengdu (30.64°N) and northern in Yong Deng (36.7°N). Altitudinal range from 370m to 3500m. Found at river banks, in open forest, and in parks. Regularly occurs in concrete-sealed city centers with few trees or some greenery ^[1].
• Colony Type: Single-queen (monogyne) colonies, following typical Lasius niger group patterns. Queens likely seal themselves in during founding (claustral) and raise first workers alone.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 7-9mm based on Lasius genus patterns
  • Worker: 3.5-4mm (CS 965 ± 57 µm) ^[1]
  • Colony: Likely several thousand workers at maturity, similar to L. niger
  • Growth: Moderate, typical Lasius development timeline
  • Development: 6-10 weeks at optimal temperature (estimated from Lasius genus patterns) (Development time varies with temperature, warmer conditions within range accelerate development, cooler slow it down)
• Antkeeping:
  • Temperature: Keep at 20-25°C. This is a temperate species from northern China that can tolerate cooler conditions. Room temperature (around 20-22°C) is ideal. A heating cable on one side of the nest creates a gradient allowing ants to self-regulate ^[1].
  • Humidity: Moderate humidity preferred. Keep nest substrate moist but not waterlogged. These ants naturally occur near river banks so they appreciate some moisture, but can handle drier conditions than many species given their urban adaptability. Provide a water tube as their primary water source.
  • Diapause: Yes, this is a temperate species from northern China with documented high-altitude records up to 3500m. You should hibernate colonies at 5-10°C for 2-3 months during winter, typically October/November through March in the Northern Hemisphere.
  • Nesting: Y-tong (AAC), plaster, or test tube setups work well. They adapt to various nest types similar to L. niger. Provide a dark nesting chamber. They do well in both naturalistic setups with soil and in artificial formicaria.
• Behavior: Generally calm and non-aggressive, typical of Lasius genus. Workers are active foragers that readily accept sugar water and protein. They are not strong climbers but can escape through small gaps, use fluon on edges. This species is more tolerant of urban conditions than many ants, making them forgiving for beginners. They establish colonies quickly once founding is complete.
• Common Issues: escape prevention, use fluon barriers as workers can squeeze through tiny gaps, hibernation failure, colonies often die if not given proper winter rest at appropriate temperatures, founding colony loss, claustral queens sometimes fail if disturbed during sealing period, overfeeding mold, excess sugar water or protein can cause mold issues in enclosed nests, test tube flooding, ensure water reservoirs are properly sized to avoid drowning the colony

Housing and Nest Setup

Lasius chinensis adapts well to various captive setups. Test tubes work perfectly for founding colonies, use a standard test tube with a cotton ball separating the water reservoir from the ants. For established colonies, Y-tong (AAC) nests, plaster nests, or acrylic formicaria all work well. These ants are not particularly fussy about nest materials, similar to their close relative L. niger. Provide a dark area for the nest chamber. Since they naturally occur in urban environments, they tolerate vibration and disturbance better than many ant species. Ensure your setup has proper escape prevention, apply fluon or barrier gel around the edges of any formicarium. ^[1]

Feeding and Diet

Like other Lasius species, Lasius chinensis is omnivorous with a strong sweet tooth. Offer sugar water (1:1 ratio) or honey as a constant energy source. For protein, provide small insects like fruit flies, small crickets, or mealworms. In the wild, they tend aphids and feed on honeydew, so sugar sources are essential for colony health. Feed protein 2-3 times per week depending on colony size. Remove uneaten prey after 24-48 hours to prevent mold. A varied diet helps, try different protein sources to see what your colony prefers. Fresh water should always be available.

Temperature and Seasonal Care

This species does well at room temperature (20-25°C). Being from northern China with altitudinal ranges up to 3500m, they are adapted to cooler temperatures than many tropical ants. During summer, avoid overheating, temperatures above 30°C can be harmful. In winter, you must provide a hibernation period. Reduce temperature gradually in autumn, then store colonies at 5-10°C for 2-3 months. A refrigerator or cool basement works well. Do not feed during hibernation. Bring them back to room temperature gradually in spring. This diapause period is essential for colony health and queen reproduction. ^[1]

Colony Development

A claustral queen will seal herself into a small chamber and not leave until her first workers emerge. During this founding period (typically 4-8 weeks depending on temperature), she relies entirely on stored fat reserves. Do not disturb a founding queen, any vibration or light exposure can cause her to abandon or consume her eggs. Once nanitic (first) workers emerge, they will begin foraging. The colony grows gradually at first, then accelerates as worker numbers increase. A mature colony may contain several thousand workers. Queens can live for 15-20 years with proper care.

Behavior and Temperament

Lasius chinensis workers are active and efficient foragers. They are not aggressive and rarely sting, their sting is mild and rarely penetrates human skin. Workers communicate using chemical trails and will quickly exploit food sources once discovered. This species shows good adaptation to urban environments, similar to L. niger, making them tolerant of the minor vibrations and disturbances that come with captive keeping. They establish clear foraging patterns and will readily take sugar water once discovered. Their dark coloration with the characteristic yellowish leg joints makes them distinctive in the ant keeper's setup. ^[1]

Frequently Asked Questions

References