Lasius schaeferi

Quick Summary

• Difficulty: Expert, due to extreme cold adaptation and no captive records
• Origin & Habitat: Tibet and western China at approximately 33.60°N,96.58°E,3900 m elevation. The type locality has a vegetation period of only 3.5 months, night frosts until May, and daily temperature ranges exceeding 40°C in summer ^[1].
• Colony Type: Likely monogyne (single queen) based on typical Lasius patterns, though not directly documented.
• Size & Growth:
  • Queen: Size data unavailable, only head measurements known. Inferred from related Lasius, possibly around 8-9 mm total length ^[3].
  • Worker: Size data unavailable. Based on related Lasius species, workers are small, roughly 3-4 mm ^[3].
  • Colony: Unknown, likely moderate, possibly several hundred to a few thousand workers, but not documented.
  • Growth: Unknown, likely slow due to extreme cold and short active season.
  • Development: Unconfirmed. Based on cold-climate Lasius, estimate 8-12 weeks at optimal temperature, but may be longer given the extreme habitat ^[1]. (Direct development data does not exist. The short 3.5-month growing season suggests colonies may produce only one or two broods per year.)
• Antkeeping:
  • Temperature: Keep cool. The natural habitat has extreme temperature swings. Provide a temperature gradient with a cool zone around 15-20°C, avoid sustained heat above 25°C. Overheating is a serious risk. In winter, provide hibernation at 5-10°C for 3-4 months ^[1].
  • Humidity: Moderate humidity. Keep the nest substrate lightly moist but allow portions to dry between waterings. Avoid waterlogging, which could promote mold.
  • Diapause: Yes, essential. The species experiences months of freezing conditions. Provide a cold winter period of 3-4 months at 5-10°C ^[1].
  • Nesting: Likely nests in soil under stones. Use a naturalistic setup with a soil chamber or a Y-tong/plaster nest. Keep the nest cool and stable.
• Behavior: Typical Lasius: docile, not aggressive. Workers forage for nectar, honeydew, and small insects. Escape risk is moderate, standard barrier methods (Fluon, talc) work for ants of this size.
• Common Issues: no captive records exist, all care is inferred from habitat data and genus patterns, overheating is a critical risk, keep the nest cool, ideally below 25°C, hibernation failure likely prevents colony development, provide 3-4 months of cold dormancy, colony growth is expected to be very slow due to the short active season, unknown dietary preferences, may not accept common feeder insects, experimentation needed

Origin and Natural Habitat

Lasius schaeferi is known only from a single collection site in Tibet at approximately 33.60°N,96.58°E, at 3900 m elevation ^[1][2]. This site has the harshest climate of any Lasius species worldwide: the growing season is only 3.5 months, night frosts occur until late May, and summer daily temperature swings exceed 40°C ^[1]. The type specimens were collected during Ernst Schäfer's 1934-1936 expedition, at station 131 on August 4,1935 ^[1]. This extreme cold adaptation means the species is unlikely to thrive in typical warm ant-keeping setups.

Identification and Distinguishing Features

Workers are small, with a pale yellowish-brown head and mesosoma, and a yellow to yellowish-brown gaster ^[1]. The key identification feature is the numerous erect hairs on the hind tibia: on average 12.7,compared to only 2.8 in the similar Lasius obscuratus ^[2]. These hairs also occur on the distal half of the extensor profile, separating it from related species Lasius lawarai and Lasius wittmeri ^[2]. Lasius schaeferi is part of the Lasius obscuratus species complex ^[3]. Queens are larger, with similar pale coloration.

Temperature and Seasonal Care

This is the most critical aspect. The species is adapted to extreme cold and should be kept cool year-round. Provide a nest area at roughly 15-20°C, with a clear gradient that lets workers choose. Overheating is a serious risk, if workers cluster away from the warm side, the nest may be too hot. In winter, a hibernation period of 3-4 months at 5-10°C is essential, mimicking the long freezing season in Tibet ^[1]. Do not keep this species warm like tropical ants.

Feeding and Nutrition

Like other Lasius species, Lasius schaeferi likely feeds on nectar, honeydew, and small insects. Offer a constant supply of sugar water or honey, and provide protein from small insects like fruit flies, small mealworms, or crickets once or twice a week. Adjust frequency based on colony size, remove uneaten food to prevent mold. The short growing season in the wild suggests they may store food, but this is unconfirmed. Fresh water should always be available.

Nesting Preferences

In the wild, these ants likely nest in soil under stones, using the thermal mass of rocks to moderate temperature. For captive care, a naturalistic setup with a soil chamber or a Y-tong/plaster nest works well. The nest must stay cool. Avoid nests that become warm (e.g., near heat sources). Chambers should be sized for small workers (roughly 3-4 mm).

Colony Establishment and Growth

Lasius schaeferi has never been kept in captivity. Queens likely found colonies claustrally, as is typical for Lasius. Colony growth is expected to be slow given the extreme climate and likely long development times. The short 3.5-month active season suggests only one or two broods per year. Patience is essential, establishing a captive colony would be pioneering work. ^[1]

Frequently Asked Questions

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References