Vollenhovia keralensis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the southern Western Ghats of Peninsular India, specifically Kerala state. Found in tropical evergreen forests and mixed forests at elevations of 500-1,200 meters, particularly in Myristica swamp forests and southern subtropical hill forests ^[1].
• Colony Type: Likely monogyne based on colony composition, but not explicitly confirmed. One documented colony had many workers and alate gynes, suggesting a single queen ^[1]. No parasitic behavior has been observed ^[1].
• Size & Growth:
  • Queen: ~4.81 mm ^[1]
  • Worker: ~3.53-3.65 mm ^[1]
  • Colony: Up to approximately 100 workers based on a single field colony of 52 workers ^[1]
  • Growth: Moderate, inferred from similar tropical Myrmicinae
  • Development: Estimated 6-8 weeks at tropical temperatures (24-28°C) based on typical Myrmicinae development (Development timeline not directly studied, estimates based on patterns in warm conditions)
• Antkeeping:
  • Temperature: Keep at 24-28°C (tropical species from warm evergreen forests) ^[1]. A gentle gradient is recommended.
  • Humidity: High humidity preferred. Their natural habitat is damp tropical forest with Myristica swamp forests. Keep the nest substrate consistently moist but not waterlogged ^[1].
  • Diapause: Unlikely required, being a tropical species, they probably do not need hibernation. A slight cool period (20-22°C) during winter may be beneficial but is not necessary.
  • Nesting: Natural nesting is under bark and in crevices of dead tree trunks ^[1]. In captivity, use a naturalistic setup with wood pieces or a Y-tong/plaster nest with narrow chambers scaled to their small worker size. Provide tight spaces and narrow passages.
• Behavior: Workers are predatory, actively hunting small arthropods including beetle larvae on tree bark, dead wood, and bracket fungi ^[1]. They are shy and quickly retreat into tiny crevices when disturbed ^[1]. They have a small sting, which is used to smear venom onto enemies rather than piercing (typical for their tribe Crematogastrini). Because workers are only ~3.5 mm, you need to seal any gaps smaller than 2 mm to prevent escapes.
• Common Issues: new species with very limited captive data, care requirements are not well-established, small colony size means losses have a bigger impact, start with a healthy colony, predatory diet requires live prey, may not accept commercial ant foods, humidity needs are critical, too dry causes mortality, difficulty establishing colonies from founding is unknown, queen isolation may be challenging

Housing and Nest Setup

Vollenhovia keralensis naturally nests under the bark of dead tree trunks and in crevices of fallen wood ^[1]. For captive care, a naturalistic setup with small wood pieces or a Y-tong (AAC) nest with narrow chambers works well. They prefer tight spaces scaled to their small worker size (3.53-3.65 mm). Provide multiple small chambers connected by narrow passages. Since they are a tropical species, avoid temperature extremes and keep away from air conditioning or cold drafts. A small water reservoir in the nest helps maintain humidity, but avoid flooding, these ants are not aquatic.

Feeding and Diet

These ants are predatory hunters in the wild, feeding on beetle larvae and small arthropods found on tree bark, dead wood, and bracket fungi ^[1]. In captivity, you should offer small live prey such as fruit flies, small mealworms, and other tiny insects. They will likely accept protein-rich foods but may be reluctant to take sugar sources, this is common for predatory Myrmicinae. Offer small live prey regularly and remove any uneaten prey after 24-48 hours to prevent mold. A shallow water source should always be available.

Temperature and Seasonal Care

As a tropical species from the Western Ghats (500-1,200 m elevation), these ants prefer warm conditions around 24-28°C ^[1]. This matches their natural habitat in tropical evergreen forests. They likely do not require a true hibernation diapause, but you might provide a slight temperature reduction (around 20-22°C) during winter months to simulate natural seasonal cycles. Avoid temperatures below 20°C or above 32°C. A heating cable on one side of the nest can create a gentle gradient if your room temperature is below their ideal range.

Behavior and Colony Dynamics

Workers are shy and secretive, when disturbed, they quickly retreat into tiny holes and crevices in their environment ^[1]. This behavior makes them less visible than some other ant species. Colonies are relatively small, with documented wild colonies containing around 50 workers plus reproductive castes ^[1]. The species has a small sting, used to smear venom onto enemies (typical for the tribe Crematogastrini). They are not aggressive toward keepers. Queens are larger than workers (4.81 mm vs 3.53-3.65 mm) and all three castes have been described, which is unusual in the genus ^[1]. Expect slow to moderate colony growth, these are not fast-growing species.

Frequently Asked Questions

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References