Colobopsis rothneyi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the Indomalaya region, specifically found in India (West Bengal, Odisha, Sikkim, Uttarakhand), Nepal, Bangladesh, and Singapore ^[1][2]. These ants inhabit tropical and subtropical environments with warm temperatures and moderate to high humidity. They are typically found in forested areas and likely nest in rotting wood or under stones.
• Colony Type: Colony structure is unconfirmed. Further research is needed to confirm whether colonies have single or multiple queens.
• Size & Growth:
  • Queen: Approximately 7mm ^[3]
  • Worker: Approximately 4mm ^[3]
  • Colony: Unknown, likely moderate-sized colonies based on related species patterns
  • Growth: Moderate
  • Development: Development time is unconfirmed for this species (No specific development data exists for C. rothneyi. Related tropical Camponotini species typically take 6-8 weeks at warm temperatures, but this is not confirmed for this species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This species originates from warm tropical and subtropical regions, so maintain temperatures in the low-to-mid 20s Celsius. A gentle gradient with a heating cable on one side of the nest allows workers to self-regulate.
  • Humidity: Maintain moderate to high humidity, roughly 60-80%. The natural habitat in tropical forests suggests they prefer damp conditions. Keep the nest substrate consistently moist but not waterlogged, with some drier areas available for the ants to choose.
  • Diapause: Likely no true diapause required. Given their tropical/subtropical distribution across India and Nepal, these ants probably remain active year-round without a winter rest period. However, a slight reduction in temperature during cooler months may be beneficial.
  • Nesting: In nature, they likely nest in rotting wood or under stones, typical of Colobopsis species. In captivity, a Y-tong (AAC) nest or plaster nest with narrow chambers works well. Provide damp substrate and avoid overly dry conditions.
• Behavior: These ants are generally calm and not particularly aggressive. Workers are moderately active and likely forage for honeydew and small insects. As with other Colobopsis species, they may have a soldier caste capable of blocking nest entrances with their specialized heads. Escape risk is moderate, at 4mm worker size, standard escape prevention measures (tight-fitting lids, barrier tape) are recommended but not as critical as for tiny species. They are not known to be invasive outside their native range.
• Common Issues: colonies may be difficult to establish due to their rarity in the wild, slow founding phase, queens may take several months to raise first workers, humidity control is critical, too dry and brood will fail, too wet and mold becomes a problem, escape prevention should be maintained even though they are not tiny ants, wild-caught colonies may carry parasites that can decimate captive colonies

Getting Started: Founding a Colony

Colobopsis rothneyi founding behavior is unconfirmed. For best results, set up your queen in a test tube setup with a water reservoir. Place the tube in darkness and avoid disturbing her for 4-6 weeks. After the first workers emerge, you can begin offering tiny amounts of sugar water and small protein sources like fruit flies or small mealworm pieces. Wait until you have 10-15 workers before considering a transfer to a larger nest. The founding phase can be slow, be patient and resist the urge to check on her too frequently, as this can stress the queen and cause her to abandon or eat her brood.

Housing and Nest Setup

For founding colonies, a simple test tube setup works well. Fill a test tube about one-third with water, plug it with a cotton ball to create a water reservoir, then place the queen in the dry portion. For established colonies with 20+ workers, consider a Y-tong (AAC) nest or plaster formicarium. These nests hold humidity well, which is important for this tropical species. The chambers should be appropriately sized, not too large for the colony size, as ants feel safer in snugger spaces. Add a shallow outworld for foraging and place a heat source like a heating cable on one side of the nest to create a temperature gradient. Cover the nest partially to provide dark areas for the ants to retreat to. Always use escape prevention, while not tiny, these ants can still squeeze through small gaps.

Feeding Your Colony

In the wild, Colobopsis rothneyi likely feeds on honeydew from aphids and scale insects, plus small insects they can overpower. In captivity, offer a constant source of sugar water (honey water or sugar water in a small test tube with a cotton wick). For protein, provide small live or frozen insects like fruit flies, pinhead crickets, or small mealworms. Feed protein roughly twice a week, removing any uneaten prey after 24 hours to prevent mold. As the colony grows, increase food portions accordingly. A varied diet helps ensure healthy development, try alternating between different protein sources. Fresh fruit can occasionally be offered as a sugar source, but remove it before it ferments.

Temperature and Seasonal Care

As a species from tropical and subtropical Asia, Colobopsis rothneyi prefers warm conditions. Keep the nest area at 24-28°C for optimal brood development. A heating cable placed on top of the nest (never underneath where it could dry out the substrate too quickly) creates a gentle gradient allowing workers to regulate their own temperature. Room temperature in most homes may be too cool, monitor with a thermometer. Unlike temperate species, these ants likely do not require a true diapause or hibernation period. However, a slight reduction during winter months (dropping to around 20-22°C) may be natural and is generally well-tolerated. Avoid temperatures below 18°C or above 32°C for extended periods.

Understanding Colony Development

Colobopsis rothneyi is polymorphic, meaning colonies contain different worker sizes (majors and minors). This is typical of the genus and Camponotini tribe. Development time is unconfirmed for this species. The first workers are typically smaller than normal workers. Growth rate is moderate, do not expect rapid colony expansion. A healthy colony may take 1-2 years to reach 100+ workers. Be patient during the founding phase, as this is when colonies are most vulnerable. Avoid the temptation to overfeed, as excess food mold can kill developing brood.

Frequently Asked Questions

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References