Polyrhachis lachesis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Northern Queensland, Australia, open eucalypt forests and savannah woodlands, preferring bare ground without grass cover ^[1][2]
• Colony Type: Unconfirmed, no specific data on queen number or social structure
• Size & Growth:
  • Queen: ~8.37 mm ^[1], only one specimen measured
  • Worker: 7.06-8.21 mm ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, no development data available
  • Development: Unknown, no species-specific data available (Based on related Polyrhachis species, development may take several weeks at warm temperatures)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly low-to-mid 20s°C, based on their tropical habitat ^[1][2]
  • Humidity: Provide a humidity gradient, mostly dry nest chamber with one small moist area, based on their dry savannah habitat ^[1][2]
  • Diapause: Unknown, no data on hibernation needs, but tropical species may not require full diapause
  • Nesting: Subterranean ground-nesters, prefer bare soil without grass cover ^[1]. In captivity, use soil or Y-tong nests with deep substrate for tunneling. They spin cocoons, so keep nest dry to prevent mold ^[3][4]
• Behavior: Generally calm and non-aggressive. Workers are moderately active foragers. Escape risk is moderate due to their size, but standard barriers work well. They are not known for stinging ^[2].
• Common Issues: colonies may fail if kept too humid, these are savannah species that prefer drier conditions, cocoon-spinning means pupae are vulnerable to mold in overly humid nests, wild-caught colonies may have parasites that are difficult to detect, slow establishment period, don't panic if colony seems inactive during founding

Housing and Nest Setup

Polyrhachis lachesis is a subterranean ground-nesting species that naturally prefers bare ground without grass cover ^[1]. In captivity, you can house them in a naturalistic setup with a deep soil layer allowing them to excavate tunnels, or use a Y-tong nest with compact chambers. Since they spin cocoons ^[3][4], keep the nest moderately dry to prevent mold. Provide an outworld for foraging with a water tube and feeding station.

Feeding and Diet

Polyrhachis ants are typically omnivorous, feeding on honeydew and insects in the wild. In captivity, offer sugar sources like honey water and protein like small crickets or fruit flies. Remove uneaten food to prevent mold. ^[2]

Temperature and Seasonal Care

As an Australian species from tropical areas, keep the nest warm at roughly low-to-mid 20s°C. A heating cable on one side can create a temperature gradient. During winter, if the colony shows reduced activity, a slight cooldown to around 18-20°C may be appropriate, but full hibernation is likely not required ^[1][2].

Behavior and Handling

Polyrhachis lachesis is generally calm and docile. Workers are moderately active and will forage in the outworld. They do not pose a sting threat. When moving colonies, handle gently. Standard escape prevention like Fluon on rims is recommended due to their size ^[2].

Frequently Asked Questions

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References