Polyrhachis laevissima

Polyrhachis laevissima

Polyrhachis laevissima is a medium-sized ant species belonging to the subgenus Cyrtomyrma. Workers measure 6-7mm and are distinctively glossy black with strikingly light red legs, making them visually striking in any collection. Queens are larger at 8-10mm, while males reach about 6mm. This species ranges across Southeast Asia, from Myanmar and India through Thailand, Malaysia, and Indonesia to Borneo. They inhabit forest edges and grassland, where they forage exclusively on the ground surface. Unlike many ants, they construct arboreal nests using carton material rather than nesting in soil ^[1][2].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southeast Asia, Myanmar, India, Thailand, Malaysia, Sumatra, Java, and Borneo. Found in forest and grassland habitats, absent from human-modified areas ^[3][4]. They live in mixed deciduous forests and have been recorded foraging on soil in forest edges ^[5].
• Colony Type: Colony structure is not well documented. Based on related Polyrhachis species, likely monogyne (single queen) but this requires confirmation.
• Size & Growth:
  • Queen: 8-10mm ^[6]
  • Worker: 6-7mm ^[7]
  • Colony: Unknown, no colony size data available
  • Growth: Moderate, estimated based on related Polyrhachis species
  • Development: Estimated 6-8 weeks at tropical temperatures based on genus patterns (Direct development data unavailable, estimated from related species in the genus)
• Antkeeping:
  • Temperature: Keep warm at 24-28°C. This is a tropical species from Southeast Asia, so they need consistent warmth ^[5]
  • Humidity: Moderate to high humidity around 60-80%. They naturally occur in humid forest environments ^[5][3]
  • Diapause: Unlikely, being a tropical species, they probably do not require a true hibernation period. However, a slight reduction in temperature during winter months may be beneficial.
  • Nesting: Arboreal nesters, they build nests in trees using carton material ^[1][2]. In captivity, a naturalistic setup with branches or cork bark elevated from the substrate works well. They also accept Y-tong nests but should have access to vertical structures for nest building.
• Behavior: Generally calm and non-aggressive compared to some other Formicinae. Workers are active foragers that search for food on the ground. They are not known to be particularly defensive. Escape risk is moderate, use standard barrier methods. As medium-sized ants, they are not extreme escape artists but should still be contained properly.
• Common Issues: tropical species needs warm conditions, cold temperatures will slow or stop brood development, arboreal nesting means they need vertical space and climbing structures, not just horizontal chambers, absence from human habitats suggests they may be sensitive to disturbance, keep colony in a quiet location, limited data means many aspects of care are estimated from related species, ground-foraging behavior means food should be offered on the nest surface, not buried in substrate

Behavior and Colony Dynamics

Workers are active foragers that search for food on the ground surface ^[3][4]. They are not particularly aggressive or defensive, making them manageable in captivity. The colony will likely grow at a moderate pace, expect several months to a year before you see significant numbers. Unlike some ants that produce cocoons, Polyrhachis species produce naked pupae ^[1], so you may see the pupae directly before they emerge as adult ants. Queens are relatively large (8-10mm) and should be handled gently during founding. The species has been found in urban areas of Bangkok ^[8], suggesting some tolerance for human presence, but they are absent from heavily developed human habitats.

Frequently Asked Questions

References