Polyrhachis convexa

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to India, Sri Lanka, and southern China, found in wet and dry zones, typically nesting in soil or under stones ^[2][1].
• Colony Type: Colony structure is unconfirmed. Based on Polyrhachis patterns, likely single-queen colonies.
• Size & Growth:
  • Queen: Size data unavailable, inferred from Polyrhachis genus (~8-10 mm)
  • Worker: 5.5-6 mm ^[1]
  • Colony: Size data unavailable
  • Growth: Moderate
  • Development: Unknown, estimated 6-8 weeks based on related Formicinae species (Development time inferred from genus patterns)
• Antkeeping:
  • Temperature: Keep warm, roughly 24-28°C, based on tropical distribution ^[3][2].
  • Humidity: Keep nest substrate consistently moist but not waterlogged, as they are found in both wet and dry zones ^[2].
  • Diapause: No diapause required, as they are from tropical/subtropical areas ^[2][3].
  • Nesting: Prefer tight chambers in soil, under stones, or in rotting wood. Use Y-tong (AAC), plaster, or soil nests.
• Behavior: Generally calm and non-aggressive. Workers have spines for defense but rarely use them aggressively. Escape risk is moderate due to size.
• Common Issues: colonies may stagnate if temperatures drop below 20°C for extended periods, wild-caught colonies can harbor parasites that cause colony collapse, nest humidity balance is tricky, too wet causes fungal issues, too dry causes brood death, escape prevention needed, workers can squeeze through small gaps

Housing and Nest Preferences

Polyrhachis convexa adapts well to various captive setups. Y-tong (AAC) nests work excellently, mimicking natural concealed spaces. Plaster nests with water channels maintain appropriate humidity. For naturalistic setups, use a soil substrate with some sand mixed in, and include flat stones or pieces of bark for cover. These ants prefer tight, snug chambers over spacious ones. The outworld should include a water tube and can be decorated for enrichment. Lighting should be indirect to avoid stress.

Feeding and Diet

Like other Formicinae ants, P. convexa is omnivorous. Feed a mix of protein and sugar sources. Protein options include small insects like fruit flies or pinhead crickets, and they will also accept cat food or dog food kibble. For sugars, offer sugar water, honey, or diluted honey water regularly. Feed protein 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24 hours to prevent mold.

Temperature and Seasonal Care

Maintain temperatures between 24-28°C for optimal activity. These ants come from warm climates and do best with consistent warmth. A small heating cable placed on one side of the nest creates a temperature gradient they can regulate by moving. During winter, if room temperature stays above 20°C, no special care is needed. Unlike temperate species, they do not require hibernation. ^[3][2]

Behavior and Colony Dynamics

Workers are active foragers that search for food. They are not particularly aggressive but will defend their nest if threatened. The spines on their thorax and petiole serve as physical defense. Colonies grow moderately, and queens are relatively long-lived. Workers have moderate lifespans of several months to over a year. ^[1]

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References