Protanilla rong

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Cuc Phuong National Park, Ninh Binh, Vietnam, at approximately 145 m elevation. The only known colony was collected inside a macrotermitine termite mound ^[1].
• Colony Type: Presumably monogyne (single queen). Queens are alate (winged), unlike the ergatoid (wingless) queens of the related Protanilla wallacei ^[1].
• Size & Growth:
  • Queen: Size data unavailable, head width ~0.42 mm ^[1].
  • Worker: Size data unavailable, head width ~0.35–0.37 mm ^[1].
  • Colony: Unknown – only one colony collected (7 workers,1 queen) ^[1].
  • Growth: Unknown
  • Development: Unknown – no direct data available (Synchronous brood development observed: all larvae in the collected colony were at the same instar, suggesting batch-style brood production rather than continuous ^[1].)
• Antkeeping:
  • Temperature: No specific data. Based on tropical origin, likely needs warm conditions (24–28°C). Use a heat gradient and monitor ant behavior.
  • Humidity: High humidity required, consistent with termite mound environment. Keep nest substrate consistently moist but not waterlogged ^[1].
  • Diapause: Unknown – as a tropical species from Vietnam, probably does not require hibernation. Do not artificially cool unless observing dormancy.
  • Nesting: Natural nesting in termite mounds suggests preference for enclosed, humid spaces. Use Y-tong (AAC) or plaster nests with tight, small chambers ^[1].
• Behavior: Behavior unstudied in captivity. Based on related Leptanillinae, workers are likely subterranean and secretive. Temperament unknown. Their minute size (head width under 0.4 mm) makes escape prevention critical – they can pass through gaps invisible to the naked eye. Use Fluon on all edges and fine mesh barriers.
• Common Issues: extreme escape risk due to minute size – standard ant barriers may not work, no established captive care protocols – this species was only described in 2025, synchronous brood production may cause slow and irregular colony growth, wild-collected colonies may carry parasites or struggle to adapt to captivity, temperature and humidity needs are unconfirmed, careful monitoring and experimentation required

Discovery and Rarity

Protanilla rong was described in 2025 from a single colony collected in Cuc Phuong National Park, Vietnam ^[1]. It belongs to the Protanilla rafflesi species group. Only this one collection is known, making it exceptionally rare. The colony was found inside a macrotermitine termite mound, representing the first time any Leptanillinae has been documented nesting in termite structures ^[1]. The species name 'rong' honors the local term for the ant.

Identification and Appearance

Workers have a uniform yellowish color ^[1]. Their head narrows toward the front, and the mandibles bear about 12 peg-like teeth along the inner edge ^[1]. The petiole (waist segment) has a distinct node with a small projection underneath (subpetiolar process) ^[1]. Queens are alate (winged) and slightly larger, with a head width of about 0.42 mm ^[1]. They have compound eyes and ocelli, which workers lack.

Colony Structure

The species is presumed monogyne (single queen) ^[1]. All larvae in the collected colony were at the same developmental stage, indicating synchronous brood production in batches rather than continuous rearing ^[1]. This pattern may affect growth in captivity, as brood develops in distinct cohorts.

Housing and Nest Setup

Given their termite mound habitat, aim for an enclosed, humid nest. Y-tong (AAC) or plaster nests with small, tight chambers work well. The most critical concern is the ants' tiny size – head width under 0.4 mm. They can escape through gaps invisible to the naked eye. Apply Fluon to all edges and use fine mesh (e.g.,0.1 mm mesh) over ventilation holes. Ensure all connections are completely sealed. Provide a test tube with cotton as a moisture source. ^[1]

Feeding and Diet

No direct feeding observations exist. Based on Leptanillinae biology, they likely hunt small soil arthropods ^[1]. Offer live micro-prey such as springtails, fruit fly larvae, or micro-mites. Remove uneaten food after 24 hours to prevent mold. Sugar water acceptance is uncertain – do not rely on it until confirmed.

Temperature and Humidity Requirements

As a tropical species from northern Vietnam, provide warm conditions (24–28°C) using a heat cable gradient, allowing ants to choose their preferred spot. Humidity should be high: keep the nest substrate consistently damp but not waterlogged. Avoid direct sunlight and drafts that cause temperature swings. Adjust based on observed activity, if workers avoid heated areas, reduce temperature slightly. ^[1]

Frequently Asked Questions

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References