Polyergus ruber

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Southeastern United States, from Maryland to Georgia, west to Louisiana, and north to eastern Missouri. They inhabit upland grassy areas and open woodlands with acidic soils ^[2][1][3].
• Colony Type: Dulotic (slave-making) species requiring a permanent host colony of Formica biophilica. Colonies contain Polyergus ruber workers and enslaved Formica workers ^[2][1].
• Size & Growth:
  • Queen: Unknown, inferred from worker size and genus patterns (~7-8 mm)
  • Worker: 6.16-7.36 mm total length ^[1]
  • Colony: Colonies include multiple hundreds of Polyergus ruber workers plus enslaved Formica workers ^[1]
  • Growth: Slow to moderate, dependent on host colony success
  • Development: Unknown, directly tied to host colony brood development (Development is entirely dependent on host Formica workers raising the brood.)
• Antkeeping:
  • Temperature: Keep at room temperature, roughly 20-24°C. This species is not particularly temperature-demanding.
  • Humidity: Keep nest substrate consistently moist but not waterlogged, similar to their woodland habitat.
  • Diapause: Yes, based on genus patterns, likely requires winter diapause for 4-6 weeks at 10-15°C during November to February.
  • Nesting: Requires a dual-colony setup with a connected host Formica colony. Use Y-tong, plaster, soil, or 3D-printed nests with tubing to allow raids but prevent escapes. Never use acrylic nests.
• Behavior: Workers are aggressive raiders but docile toward humans. They lack a functional sting and pose no danger to keepers. Escape risk is moderate due to their size, but standard barriers work well. The key concern is that they must have a host colony to survive, without enslaved Formica workers, the colony will die ^[2][1].
• Common Issues: without a host formica colony, the colony will die, this is the most critical issue., finding and maintaining a healthy formica biophilica host colony is difficult and expensive., raiding behavior can stress or decimate the host colony if not managed properly., colonies may fail if the host queen dies before slave-makers establish their own brood., this species is not suitable for beginners due to complex host requirements.

Understanding Slave-Making Ants

Polyergus ruber is a dulotic ant species that conducts slave raids to steal brood from Formica colonies. The captured pupae emerge as adult Formica workers that integrate into the Polyergus colony and perform all worker tasks, effectively becoming slaves ^[1]. Polyergus workers themselves are specialized raiders and have lost typical worker behaviors, they cannot forage, care for brood, or maintain the nest without their slaves ^[2][1]. This makes them challenging to keep, as you must maintain both the slave-maker colony and their host Formica colony.

Housing Requirements

Keep Polyergus ruber in a dual-colony setup with a connected Formica biophilica host colony. Use test tubes, Y-tong, plaster, soil, or 3D-printed nests linked by flexible tubing that allows raids but can be closed to let the host recover. The host colony should be larger and established to survive repeated raids. Escape prevention is important but less critical due to their size, standard barriers work well. Never use acrylic nests ^[3].

Feeding and Nutrition

Feed the host Formica colony a standard ant diet: protein sources like insects 2-3 times per week and sugar water or honey constantly. The enslaved Formica workers will forage and share food with Polyergus workers through trophallaxis. Polyergus workers do not typically accept food directly from keepers.

The Raid: Behavior in Captivity

In captivity, expect evening raiding behavior during summer months. Polyergus workers march in a column toward the host colony, overwhelm defenders, and capture pupae ^[1]. To manage this, close the connecting tube after raids to allow the host colony to recover, or use multiple host colonies in rotation.

Acquiring a Colony

Starting a colony is difficult because queens cannot found colonies independently. You need an established mixed colony in the wild or obtain both a newly mated Polyergus ruber queen and a Formica biophilica colony simultaneously. This species is rarely available and requires expert knowledge ^[2][1][3].

Seasonal Care and Overwintering

Raiding activity occurs from early June to mid-August ^[1]. During winter (November to February), provide a diapause period at 10-15°C for 4-6 weeks. Reduce feeding during this time. Both slave-maker and host colonies need this dormancy.

Frequently Asked Questions

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References