Leptanilla phthirigyna

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Cuc Phuong National Park, Ninh Binh, Vietnam. Found living inside termite mounds (macrotermitine) just below the surface at approximately 400m elevation ^[1]. This is a tropical forest environment.
• Colony Type: Colony structure is not fully confirmed. A single colony was found containing two gynes (queens), which is exceptional for Leptanilla, though their reproductive phases were not synchronized suggesting they may not form stable multi-queen colonies ^[1]. Likely single-queen based on typical genus patterns.
• Size & Growth:
  • Queen: ~2mm, inferred from Leptanilla genus patterns ^[1]
  • Worker: ~1.5mm, inferred from Leptanilla genus patterns ^[1]
  • Colony: Unknown, no colony size data available ^[1]
  • Growth: Unknown, no development data available
  • Development: Unknown, no direct measurements exist for this newly described species (Development timeline has not been studied. Related Leptanilla species may develop in several weeks under optimal conditions, but specific timing is unconfirmed.)
• Antkeeping:
  • Temperature: Keep warm, around 24-28°C. This species comes from tropical Vietnam where temperatures are consistently warm year-round. Use a heating cable on one side of the nest to create a gradient.
  • Humidity: High humidity is essential. These ants live inside termite mounds which maintain humid conditions. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: No, this is a tropical species from Vietnam that does not experience cold winters. Maintain warm temperatures year-round ^[1].
  • Nesting: Based on their natural discovery in termite mounds, they likely prefer enclosed nests with high humidity. A small test tube setup or ytong nest with tight chambers scaled to their tiny size would work well. They are tiny and may have specific spatial requirements.
• Behavior: This is a poorly understood species due to its recent discovery. Based on genus patterns, Leptanilla are predatory ants that hunt small prey. They are hypogaeic (ground-dwelling) and likely avoid light. Their tiny size and association with termites suggests they may prey on termite eggs or larvae. Workers are not aggressive and likely flee from threats. Escape prevention is critical due to their extremely small size, they can squeeze through the tiniest gaps.
• Common Issues: escape prevention is critical, they are among the smallest ants and can squeeze through standard barrier gaps, no captive breeding data exists, this is a newly described species with no established husbandry protocols, humidity management is challenging, they need high humidity but also ventilation to prevent mold, prey size is problematic, their tiny size means they can only tackle extremely small prey like springtails, two queens in one colony may cause stress, the wild colony had two gynes but their phases were not synchronized, suggesting possible tension

Discovery and Taxonomy

Leptanilla phthirigyna was only described in 2025,making it one of the most recently discovered ant species available to keepers. It belongs to the Leptanilla revelierii species-group, which is distributed across east Asia ^[1]. The species was discovered in Cuc Phuong National Park in northern Vietnam during targeted sampling of termite mounds. This finding was significant because it revealed a completely new microhabitat for the Leptanillinae subfamily, previously, these ants were not known to associate with termite mounds ^[1]. The type series includes workers and queens (gynes), and the species can be identified by its three-toothed mandibles, short scapes, and specific proportions of abdominal segments ^[1].

Natural History and Habitat

The most distinctive aspect of Leptanilla phthirigyna is its association with termite mounds. Researchers found specimens just below the surface of a macrotermitine (large termite) mound at an elevation of approximately 400 meters ^[1]. This represents a previously unknown nesting microhabitat for the entire subfamily Leptanillinae. The discovery of a physogastric gyne (a queen with a distended abdomen adapted for continuous egg production) confirms that this species practices phasic brood production, similar to other Leptanilla species with known biology ^[1]. The presence of two gynes in a single putative colony is exceptional for Leptanilla, though their reproductive phases were not synchronized, suggesting this may have been a temporary association rather than true polygyny ^[1].

Housing and Nest Setup

Due to their recent discovery, there are no established husbandry protocols for Leptanilla phthirigyna. However, based on their natural history, you should provide a small, enclosed nest that maintains high humidity. A small test tube setup works well for founding colonies, use a test tube with a water reservoir at one end and fill roughly one-third with cotton. For established colonies, a small ytong nest with tight chambers scaled to their tiny size is appropriate. Given their association with termite mounds, adding some termite nest material or substrate from their natural habitat may help, though this is speculative. Escape prevention is absolutely critical, these ants are among the smallest in the world and can squeeze through gaps invisible to the naked eye. Use fluon on all edges and ensure container lids fit tightly ^[1].

Feeding and Nutrition

Leptanilla are predatory ants, and L. phthirigyna almost certainly requires small live prey. Based on related species in the genus, they likely hunt small soil arthropods. In captivity, you should offer live springtails as a primary food source, these are small enough for their tiny workers to tackle. Other potential prey includes tiny isopods, micro-arthropods, and fruit fly larvae. The association with termite mounds raises the interesting possibility that they may prey on termite eggs or larvae, offering small termite pieces may be worth experimenting with. Sugar sources are unlikely to be accepted given their predatory nature. Feed small amounts of prey every few days, removing any uneaten prey to prevent mold ^[1].

Temperature and Seasonal Care

As a species from tropical Vietnam, Leptanilla phthirigyna requires warm conditions year-round. Aim for temperatures in the range of 24-28°C, which matches their natural environment in Cuc Phuong National Park. A heating cable placed on one side of the nest creates a temperature gradient allowing the ants to self-regulate. Place the heating on top of the nest material, not underneath, to avoid drying out the substrate too quickly. Given their tropical origin, they do not require a true diapause or hibernation period. Maintain consistent temperatures, avoid drafts and sudden temperature changes ^[1].

Challenges and Considerations

This species is not recommended for beginners. The combination of its recent discovery (2025), tiny size, unknown colony requirements, and lack of captive breeding data makes it an expert-level species. The primary challenges include: escape prevention (they are among the smallest ants and require fine mesh and excellent barriers), humidity management (they need high humidity but also ventilation to prevent mold), and prey size (their tiny workers can only tackle extremely small live prey). There is no established protocol for keeping this species, so you will essentially be pioneering captive husbandry. Monitor colonies closely for signs of stress, and be prepared to experiment with different setups. If the colony struggles, consider adjusting temperature, humidity, or prey types ^[1].

Frequently Asked Questions

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References