Pseudolasius circularis

Quick Summary

• Difficulty: Unknown
• Origin & Habitat: Only known from Singapore ^[1]. Collected at night while attracted to artificial lights ^[2][3], indicating nocturnal or crepuscular activity.
• Colony Type: Unknown. No documented observations of colony structure.
• Size & Growth:
  • Queen: Size data unavailable, not recorded in available literature.
  • Worker: Workers are undescribed in scientific literature.
  • Colony: No data available.
  • Growth: Unknown
  • Development: Unknown, no development data exists for this species. (No species-specific development data. Estimates from related Lasiini are speculative.)
• Antkeeping:
  • Temperature: No species-specific data. Based on Singapore's warm climate (25-32°C year-round), maintain temperatures around 24-28°C. A small heating cable can create a gradient if needed.
  • Humidity: High humidity preferred, Singapore humidity often exceeds 80%. Keep nest substrate consistently moist but not waterlogged. Provide a water tube.
  • Diapause: No, Singapore has no winter. Maintain stable warm conditions year-round.
  • Nesting: No nesting data exists. Start with a test tube setup or a small soil nest with moist substrate. Avoid acrylic nests.
• Behavior: Almost nothing documented. Attraction to lights suggests nocturnal foraging ^[2][3]. Their small size and secretive nature mean escape prevention is critical, use fluon or similar barriers on all setups.
• Common Issues: no established captive care protocols, you will be pioneering all husbandry methods., workers are undescribed, making species identification very difficult without an expert., extremely rare in the hobby, no verified sources for acquisition., lack of data increases risk of unintentional errors in temperature, humidity, or feeding., no information on disease or stress tolerance.

Discovery and Taxonomy

Pseudolasius circularis was described by Hugo Viehmeyer in 1916 from a single queen collected in Singapore ^[1]. The species name 'circularis' refers to a feature in the original description, but the exact meaning is unclear. Only the queen caste has been formally described, workers remain unknown in the scientific literature ^[1]. This makes P. circularis one of the few ant species where the worker caste is entirely undocumented.

Distribution and Habitat

This species is known only from Singapore ^[1]. The only published records are of individuals attracted to lamps at night ^[2][3], suggesting nocturnal activity. Singapore's environment is consistently tropical with temperatures 25-32°C, high humidity, and abundant rainfall. The specific microhabitat (soil, leaf litter, wood) is unknown.

Keeping an Undescribed Species

Pseudolasius circularis presents a unique challenge: it has no established captive care protocol, and even confirming the species identity is difficult without an expert. This makes it an experimental species for experienced keepers only. Start with a standard test tube setup with moist cotton. For humidity, keep the tube moist but not waterlogged. Since nothing is known about diet, begin with diluted honey water (1:4 honey to water) and small protein sources like fruit flies or pinhead crickets. Observe carefully and document everything, your findings could become the first care notes for this species.

Feeding Experiment

Because no feeding data exists, you will need to experiment. Offer food in the evening (given likely nocturnal activity) and remove uneaten portions after 24-48 hours to prevent mold. Test diluted honey water, small insects (fruit flies, small crickets, mealworm pieces), and possibly soft fruits. Note which items are accepted and which are ignored. Keep portions small to avoid contaminating the nest.

Temperature and Humidity Guidelines

Without direct data, extrapolate from Singapore's climate. Keep temperatures in the range 24-28°C. Use a small heating cable on one side to create a gradient if room temperature is cooler. For humidity, aim for moderate to high, the nest substrate should feel consistently moist but never soggy. Provide a water tube for drinking. Do not attempt hibernation, maintain stable conditions year-round.

Frequently Asked Questions

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References