Polyrhachis lydiae

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Eastern Australia from Townsville in north Queensland to just north of Newcastle in New South Wales, found in open eucalypt forests and savannah woodlands ^[1][2].
• Colony Type: Unconfirmed, context does not specify queen number or social structure.
• Size & Growth:
  • Queen: 7.21-7.51 mm ^[1]
  • Worker: 5.64-6.65 mm ^[1]
  • Colony: Size data unavailable, no specific colony size data in context.
  • Growth: Unknown, no data on development speed.
  • Development: Unknown, no specific data available. (Development time is unclear, based on related species, it may be moderate.)
• Antkeeping:
  • Temperature: Based on geographic range, keep warm, roughly 24-28°C. Temperature needs are estimated ^[1].
  • Humidity: Keep nest substrate consistently moist but not waterlogged, as they are ground-nesting ^[1][4].
  • Diapause: No, based on subtropical range, likely no diapause required ^[1].
  • Nesting: Use substrate-based nests or Y-tong with soil chambers, as they are subterranean nesters ^[1][4].
• Behavior: Generally calm temperament but will defend the colony if threatened. Like other Formicinae, they can bite and spray formic acid as defense. Workers are moderately active foragers. Escape risk is moderate due to medium size, standard barriers are usually sufficient, but check for gaps.
• Common Issues: colonies may slow significantly if temperatures drop below 20°C, ground-nesting species needs appropriate substrate depth for nesting, escape prevention should be checked regularly as workers can squeeze through small gaps, limited availability in the antkeeping hobby, may be difficult to source, zombie-ant fungus is a natural pathogen but unlikely to affect captive colonies

Housing and Nest Setup

Polyrhachis lydiae is a ground-nesting species that prefers subterranean nests. In captivity, a naturalistic setup with a soil substrate works best, this allows the ants to dig their own chambers like they would in the wild. Use a substrate depth of at least 3-5 cm to accommodate their nesting behavior. Alternatively, a Y-tong nest with narrow chambers can work, but provide some soil or damp substrate in the outworld for foraging opportunities. Keep the nest area relatively dark, these ants naturally nest underground and prefer dim conditions. Include stones or decorations in the outworld that can hide nest entrances, mimicking their natural habitat under stones or grass ^[1][4].

Feeding and Diet

Like most Polyrhachis species, these ants are omnivorous. Offer a varied diet including sugar sources (honey water, sugar water) and protein (small insects like fruit flies, mealworms). They will likely accept honeydew as well if you keep aphids. Feed them every 2-3 days, removing any uneaten prey after 24 hours. A constant sugar water supply is recommended. Because they are medium-sized ants, their prey items can be slightly larger than what you'd offer to tiny ants, but keep portions reasonable ^[4].

Temperature and Heating

As an Australian species from a warm climate, Polyrhachis lydiae benefits from temperatures in the 24-28°C range. Room temperature may be sufficient in warmer homes, but a heating cable or small heat mat on one side of the nest can help maintain optimal conditions. Create a temperature gradient so workers can choose their preferred spot. Avoid temperatures below 20°C for extended periods, this species is not adapted to cold conditions and colonies may become sluggish or stop brood development entirely ^[1].

Humidity and Water

These ants prefer moderate humidity. Keep the nesting substrate slightly moist but not waterlogged, the substrate should feel damp but you shouldn't see standing water. Allow the substrate to dry partially between waterings rather than keeping it constantly wet. A water tube in the outworld provides drinking water. Mist the outworld occasionally but avoid excessive moisture in the nest area as this can lead to mold problems ^[1][4].

Behavior and Defense

Polyrhachis lydiae has a generally calm temperament and is not particularly aggressive toward keepers. However, like all Formicinae ants, they can defend themselves by biting and spraying formic acid. The formic acid spray is their primary chemical defense and may cause skin irritation in sensitive individuals. When working with the colony, move slowly and avoid disturbing the nest directly. Workers are moderately active and will forage in the outworld for food. They are not particularly fast-moving, making them relatively easy to observe.

Frequently Asked Questions

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References