Polyrhachis zhoui

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Southern China, in agarwood forests and low mountain hilly areas with rich shrubs at elevations of 45-266 m ^[1]. Habitats have high humidity (67-87%) and warm temperatures (20-23.4°C) ^[1].
• Colony Type: Polydomous system suggested, as the known nest had no foundress queen and workers escaped easily during collection ^[1].
• Size & Growth:
  • Queen: 6.85 mm ^[1]
  • Worker: 5.29-6.09 mm ^[1]
  • Colony: Up to 105 workers ^[1]
  • Growth: Unknown
  • Development: Estimated 2-4 months based on related Polyrhachis species, but unconfirmed for this species ^[1]. (Development timeline is unknown, this species was only described in 2025 with no captive breeding data.)
• Antkeeping:
  • Temperature: Keep around 22-26°C with a gentle gradient, based on collection site temperatures ^[1].
  • Humidity: Maintain high humidity with consistently moist substrate, as seen in habitats with 67-87% humidity ^[1].
  • Diapause: Unknown, as a tropical species, it may not require hibernation, but a cool period in winter might be beneficial ^[1].
  • Nesting: This species builds leaf nests in nature. In captivity, use plaster, Y-tong, or 3D-printed nests that allow humidity control and materials for manipulation ^[1].
• Behavior: Active and agile ants with high escape risk due to small size, excellent prevention is needed. Temperament is not well-documented, but Polyrhachis species are generally not aggressive. Defense involves formic acid spray, as typical for Formicinae subfamily.
• Common Issues: high humidity maintenance can lead to mold if substrate is waterlogged, escape risk is critical due to small size and agility, polydomous nature may require more space and connected chambers, no captive breeding data exists for this newly described species

Discovery and Taxonomy

Polyrhachis zhoui was described in 2025 and belongs to the P. aequalis-group within the subgenus Myrmothrinax ^[1]. It is named after Professor Shanyi Zhou for his contributions to ant taxonomy in China ^[1]. This discovery increased the number of Polyrhachis species in China to 56 ^[1]. The species is similar to Polyrhachis abnormis and Polyrhachis deceptor but can be distinguished by its upward-pointing propodeal spines and convex head margin ^[1].

Natural Nesting Behavior

The only known nest was built from a curled agarwood leaf, containing 105 workers,6 winged gynes,1 winged male, and 11 larvae ^[1]. No foundress queen was found, suggesting a polydomous system with main and satellite nests ^[1]. Collection occurred in humid agarwood forests with leaf litter ^[1].

Housing and Nest Setup

Provide a nest that mimics natural leaf nests, using plaster, Y-tong, or 3D-printed materials that allow humidity control and manipulation ^[1]. Keep the substrate consistently moist but not waterlogged to maintain high humidity. Ensure excellent escape prevention due to the ants' agility ^[1].

Temperature and Humidity

Maintain temperatures around 22-26°C with a gentle gradient, based on collection sites ^[1]. Humidity should be high, around 80-90%, with moist substrate to match natural habitats ^[1]. Monitor for condensation to avoid mold.

Feeding and Diet

Offer sugar water or honey for energy, and protein from small insects like fruit flies or mealworms every 2-3 days ^[2]. Remove uneaten prey to prevent mold.

Colony Structure and Reproduction

The known nest had multiple winged gynes and a male, indicating sexual brood production ^[1]. The absence of a foundress queen suggests polydomous behavior or replacement reproductives ^[1]. In captivity, colonies may have multiple queens, but founding behavior is unconfirmed.

Frequently Asked Questions

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References