Protanilla jongi

Protanilla jongi

Protanilla jongi is a tiny trap-jaw ant native to central Taiwan, found at elevations around 840 meters. Workers measure just 0.77-0.84mm and are brownish-yellow in color, while queens are slightly darker brown. This species belongs to the Leptanillinae subfamily and is part of the rafflesi species group. Workers are completely blind with no eyes, and they possess distinctive long triangular mandibles capable of opening 180 degrees, the same trap-jaw mechanism used by famous trap-jaw ants like Odontomachus. The colony was discovered nesting about 20cm deep in soil beneath a stone in a tea garden near secondary forest. These ants produce a strong, distinct odor that is noticeable even when the colony is undisturbed.

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Central Taiwan (Nantou) at 840m altitude in tea garden near secondary forest. Nesting chamber in soil at approximately 20cm depth, covered by a stone ^[1].
• Colony Type: Single-queen colony with approximately 25 workers,15 larvae, and 1 dealated queen observed in laboratory ^[1]. Colony structure in wild is not fully documented.
  • Colony: Monogyne
• Size & Growth:
  • Queen: 0.73 mm head length ^[1]
  • Worker: 0.77-0.84 mm head length ^[1]
  • Colony: Approximately 25 workers in studied colony, likely small colonies in general ^[1]
  • Growth: Slow
  • Development: Unknown, no development data available for this species (Based on related Leptanillinae and small colony size, expect development to take several months. Related Protanilla lini shows mixed larval instars suggesting asynchronous development.)
• Antkeeping:
  • Temperature: Unknown for this species. Based on Taiwan habitat (840m elevation, tea garden at latitude ~23°N), likely prefers moderate temperatures in the low-to-mid 20s°C range. Start around 22-25°C and monitor colony activity.
  • Humidity: Soil-nesting species requiring moderate to high substrate moisture. Keep nest substrate consistently damp but not waterlogged. The natural nest at 20cm depth suggests they prefer stable, humid conditions underground.
  • Diapause: Unknown, no documented diapause behavior. Taiwan has mild winters, so any dormancy would likely be minimal if at all.
  • Nesting: Soil-nesting species. Natural nesting chamber was at 20cm depth in soil under stone. In captivity, a naturalistic setup with deep soil (at least 10-15cm) or a plaster/acrylic nest with moisture reservoir works well. Provide a thick soil layer for them to maintain humidity and potentially burrow.
• Behavior: These ants are specialized predators with a remarkable trap-jaw mechanism. Workers can open their mandibles to 180 degrees and snap them shut during predatory attacks, the same hunting strategy used by Odontomachus trap-jaw ants. They guard nest entrances with mandibles locked in the striking position, ready to snap at any threat. They are strictly predatory and will only accept live geophilomorph centipedes as prey, typically 3-4cm in length. The colony produces a strong, distinct odor. Workers are small but fast-moving and can deliver a sting. Escape prevention should be excellent given their tiny size.
• Common Issues: extreme prey specialization makes feeding difficult, they only accept certain centipedes, small size means escapes are likely without fine mesh barriers, strong odor may be unpleasant in enclosed spaces, slow colony growth requires patience, no available information on founding behavior or development timeline makes captive breeding challenging

Housing and Nest Setup

Protanilla jongi is a soil-nesting ant that requires deep, humid substrate. In the wild, colonies nest about 20cm below the surface in chambers under stones. For captivity, create a naturalistic setup with at least 10-15cm of moist soil or use a plaster/acrylic nest with a water reservoir to maintain humidity. The key is providing a thick soil layer that stays consistently damp but never waterlogged. Because workers are tiny (under 1mm), escape prevention must be excellent, use tight-fitting lids and fine mesh on any ventilation holes. A small outworld area connected to the nest allows for feeding. Keep the setup in a quiet location as these ants are sensitive to vibrations and disturbances. ^[1]

Feeding and Diet - The Centipede Challenge

This is the most challenging aspect of keeping Protanilla jongi. Laboratory observations clearly showed extreme prey specialization: they only accepted geophilomorph centipedes approximately 3-4cm in length ^[1]. All other prey types were rejected including centipedes that were too small or too large, cockroaches, mealworms, termites, springtails, and woodlice ^[1]. This matches observations of related species, Leptanilla japonica feeds exclusively on geophilomorph centipedes 1-2cm, and Leptanilla taiwanensis larvae were found feeding on a geophilomorph about 4cm in length. You will need a reliable source of live geophilomorph centipedes. These are the long, worm-like centipedes (not the typical house centipedes). Smaller geophilomorphs around 1-2cm may be accepted by smaller colonies. Expect to spend significant effort sourcing appropriate prey.

Trap-Jaw Hunting Behavior

Protanilla jongi possesses one of the most fascinating hunting mechanisms in the ant world, trap-jaw mandibles. Workers can open their long triangular mandibles to a full 180 degrees and snap them shut with incredible speed during predatory interactions ^[1]. This is the same mechanism used by the famous trap-jaw ants in the genus Odontomachus. When hunting, workers grab the centipede's appendages with their mandibles and simultaneously sting the victim to paralyze it. The paralyzed centipede is then transported back to the nest where larvae feed on it. In the laboratory, workers were observed guarding nest entrances with mandibles locked in the striking position, ready to defend against threats ^[1]. This defensive behavior was also documented in related species Leptanilla japonica.

Temperature and Seasonal Care

Specific temperature requirements are not documented for this species. The natural habitat in central Taiwan at 840m elevation experiences moderate temperatures, the area has warm summers and mild winters. Based on the habitat and related species, aim for temperatures in the low-to-mid 20s°C range (approximately 22-26°C). Monitor your colony's activity level, if workers become sluggish, slightly increase temperature, if they avoid the heated area, reduce it. Provide a temperature gradient so ants can choose their preferred zone. Since this is a poorly understood species in captivity, observation of your colony's behavior is the best guide. No documented diapause requirement exists, and Taiwan's mild climate suggests they may not need a true hibernation period. ^[1]

Colony Dynamics and Odor

The studied colony contained approximately 25 workers,15 larvae, and 1 dealated queen ^[1]. This suggests P. jongi forms relatively small colonies, which is consistent with other Leptanillinae species. One notable characteristic is the strong, distinct odor produced by the colony, this was noticed both when excavating the nest and during laboratory observation when the colony was undisturbed ^[1]. The odor is produced by either adults or larvae, but this is not fully understood. Be aware that this odor may be noticeable in enclosed ant setups. The colony was observed for approximately 6 months in laboratory conditions, providing the limited biological data we have for this species.

Frequently Asked Questions

References