Recurvidris pickburni

Recurvidris pickburni

Recurvidris pickburni is a tiny yellow ant species native to Sri Lanka and parts of India. Workers measure just 1.9-2.1mm in total length, making them one of the smaller ant species you'll encounter ^[1]. They belong to the Myrmicinae subfamily and are characterized by their distinctive 4-toothed mandibles with an enlarged, sharply pointed basal tooth. The head has broadly rounded occipital corners that almost form a single smooth arc when viewed from the front, and their yellow coloration helps distinguish them from related species ^[1][2].

This species was described by Bolton in 1992 and named in honor of Bernerd Pickburn, a friend of the describer. They remain poorly studied in the wild, with most records coming from Sri Lanka's central highlands around Kandy at elevations of 600-700 meters, and more recently from Uttar Pradesh in northern India ^[1][3]. Their biology and captive care requirements are not well documented in scientific literature, so much of what we recommend is based on inference from related Myrmicinae species and general antkeeping principles.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Sri Lanka (Kandy,600-700m elevation) and northern India (Uttar Pradesh). Found in tropical to subtropical forested regions ^[1][3].
• Colony Type: Unconfirmed. Colony structure (single-queen vs multi-queen) has not been documented in scientific literature.
• Size & Growth:
  • Queen: Undescribed in available literature, queen size is unknown ^[1].
  • Worker: 1.9-2.1mm total length (HL 0.48-0.50mm, HW 0.44-0.46mm) ^[1].
  • Colony: Unknown. No colony size data available from research.
  • Growth: Unknown, no development data exists for this species.
  • Development: Unconfirmed. Based on typical Myrmicinae patterns in tropical species, estimate 4-8 weeks at optimal temperature, but this is speculative. (No direct development studies exist for this species. Estimates based on genus-level patterns for small tropical Myrmicinae.)
• Antkeeping:
  • Temperature: Based on Sri Lankan origin (tropical highlands), aim for warm conditions around 24-28°C. Avoid temperatures below 20°C. Provide a gentle temperature gradient if possible.
  • Humidity: Moderate to high humidity preferred. Keep nest substrate slightly moist but not waterlogged. Mist occasionally and provide a water source.
  • Diapause: Unlikely, being a tropical species from Sri Lanka, they probably do not require a true hibernation period. However, a slight reduction in temperature during winter months may be appropriate.
  • Nesting: Natural nesting habits unconfirmed. Based on related genera and their small size, they likely nest in soil, under stones, or in decaying wood. In captivity, a small test tube setup or Y-tong nest with fine chambers works well. Keep nesting area dark and quiet.
• Behavior: Behavior is poorly documented. As a small Myrmicinae, they are likely generalist foragers, collecting nectar, honeydew, and small insects. Their tiny size (under 2mm) means they can easily escape through small gaps, excellent escape prevention is essential. They are probably relatively docile compared to larger ants. Foraging activity is likely highest in warm, humid conditions.
• Common Issues: tiny size means escapes are likely without fine mesh barriers and tight-fitting lids, lack of documented care information means you may need to experiment to find optimal conditions, slow colony growth is normal for small species, don't overfeed or overhandle, wild-caught colonies may have parasites or stress from collection that causes captive failures, they likely need small prey items due to their tiny size, fruit flies and springtails are appropriate

Housing and Nest Setup

Due to their extremely small size (under 2mm), Recurvidris pickburni requires careful housing selection. A small test tube setup works well for founding colonies, use a test tube with a cotton-plugged water reservoir that provides humidity. The chamber should be dark and quiet during the founding stage. For established colonies, a Y-tong (AAC) nest with narrow chambers or a small plaster nest works better than larger commercial formicaria designed for bigger ants. Escape prevention is critical, these tiny ants can squeeze through gaps that seem impossible. Use fine mesh on any ventilation holes and ensure all connections are sealed. A small outworld for foraging allows you to observe their activity and offer food without disturbing the nest. ^[1]

Feeding and Diet

Their diet in the wild is not documented, but being a small Myrmicinae, they likely forage for nectar, honeydew, and small arthropods. In captivity, offer a combination of sugar sources (honey water, sugar water, or diluted honey) and protein. Small live prey is ideal, fruit flies, pinhead crickets, mealworms, and other tiny insects are appropriate. They may also accept commercial ant foods, but observe whether they actually consume them. Feed small amounts every few days and remove uneaten food to prevent mold. Always provide a fresh water source, either through a soaked cotton ball or small water tube.

Temperature and Humidity

As a species from tropical Sri Lanka, Recurvidris pickburni prefers warm, moderately humid conditions. Maintain temperatures between 24-28°C during the active season. A heating cable or mat on one side of the nest can create a temperature gradient, allowing the ants to self-regulate. Avoid temperatures below 20°C for extended periods. For humidity, aim for 60-80% relative humidity. The nest substrate should be slightly moist but never waterlogged. A small water tube in the outworld helps maintain humidity. During winter, you can slightly reduce temperatures (to around 20-22°C) but avoid true cold hibernation, this species is not adapted to cold winters. ^[1]

Colony Establishment and Growth

Since colony founding behavior has not been documented for this species, the best approach is to capture a mated queen during nuptial flights or locate an existing colony. If you find a queen, place her in a small test tube setup with a water reservoir. Provide a dark, quiet environment and do not disturb her during the founding stage. Expect her to lay eggs within a few weeks. The first workers (nanitics) will be very small and may take several weeks to months to emerge, depending on temperature and feeding. Growth will be slow compared to larger ant species, be patient and avoid the temptation to overfeed or check on the colony too frequently. Once the colony reaches 10-20 workers, you can consider moving them to a more permanent nest setup.

Behavior and Temperament

Specific behavioral observations for this species are lacking in scientific literature, but based on related Recurvidris species and general Myrmicinae patterns, they are likely relatively docile and non-aggressive. They probably form small colonies and are not known for being particularly territorial or aggressive toward keepers. Their tiny size makes them difficult to observe in detail, but they will likely show typical ant behaviors: workers foraging for food, caring for brood, and responding to threats. If threatened, they may bite (though with their small size, this is not painful) or secrete formic acid, which is typical of Myrmicinae. They are unlikely to sting given their small mandibles.

Seasonal Care

Being from a tropical region without pronounced winters, Recurvidris pickburni does not require true hibernation. However, you may observe reduced activity during cooler months. In captivity, you can simulate natural seasonal changes by slightly lowering temperatures (by 2-4°C) during what would be winter, but maintain at least 20°C. Reduce feeding frequency during this period but continue providing water. Do not cool them dramatically or attempt full hibernation, this species is not adapted to cold and may die. Year-round warm conditions (24-28°C) are likely ideal for maintaining active, growing colonies. ^[1]

Frequently Asked Questions

References