Scientific illustration of Polyrhachis wellmani ant - showing key identification features including head, thorax, and gaster.

Polyrhachis wellmani

Monogynous Non-Parasitic Queen No Gamergate
Sci. Name
Polyrhachis wellmani
Subgenus
Myrma
Tribe
Camponotini
Subfamily
Formicinae
Author
Forel, 1909
Distribution
Found in 1 countries
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Introduction

Polyrhachis wellmani is a medium-sized African ant found in Angola, Democratic Republic of Congo, and Zambia . Workers measure 8.3-8.7 mm in total length . They have long spines on the pronotum, short upcurved teeth on the propodeum, and a single pair of spines on the petiole, which distinguishes them from similar species like Polyrhachis schistacea . The biology of P. wellmani is not well studied, but it closely resembles Polyrhachis schistacea, suggesting similar life history traits . This means keepers can infer care from related Polyrhachis species in the militaris group.

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Status by country, from Kass et al. 2022 & Wong et al. 2023

Native Invasive Introduced (indoor) Intercepted Unknown
Data Sources
Year Range 2000 - 2026

Quick Summary

  • Difficulty: Medium
  • Origin & Habitat: Afrotropical region, including Angola, Democratic Republic of Congo, and Zambia [1][2]. Likely inhabits tropical savanna or forest edges, typical of Polyrhachis species [3].
  • Colony Type: Colony structure is unconfirmed. Based on related species, likely single-queen colonies, but specific data is lacking.
  • Size & Growth:
    • Queen: Size data unavailable
    • Worker: 8.3-8.7 mm [3]
    • Colony: Up to several hundred workers, estimated from related Polyrhachis species [3]
    • Growth: Moderate, inferred from genus patterns
    • Development: 8-12 weeks estimated under warm conditions [3] (Development time is inferred from related Formicinae species)
  • Antkeeping:
    • Temperature: Keep at 24-28°C with a gentle gradient. Inferred from tropical species requirements [3].
    • Humidity: Keep nest substrate consistently moist but not waterlogged. Provide a water source. Inferred from Afrotropical habitat [3].
    • Diapause: No, as a tropical species, they do not require hibernation [3].
    • Nesting: Use Y-tong or plaster nests with appropriately sized chambers. Avoid acrylic nests. Inferred from genus preferences [3].
  • Behavior: Workers are moderately active and not highly aggressive. They can spray formic acid as a defense but lack a sting. Escape risk is medium due to their size [3].
  • Common Issues: temperatures below 24°C can slow colony development, low humidity may cause dehydration, insufficient protein can lead to poor growth, wild-caught colonies may carry parasites, escape prevention is important despite medium size

Nest Preferences and Housing

Polyrhachis wellmani does well in standard formicarium setups. Use Y-tong or plaster nests with chambers roughly 10-15 mm in height and connecting tunnels. Match chamber size to worker size to avoid stress. A test tube setup works for founding colonies, but move to a formicarium once the colony reaches 20-30 workers. Naturalistic setups with soil can mimic their habitat [3].

Feeding and Diet

Like other Polyrhachis species, P. wellmani is omnivorous. Offer sugar sources like honey water constantly and protein such as dead insects 2-3 times per week. Remove uneaten prey after 24-48 hours to prevent mold. Fresh water should always be available [3].

Temperature and Seasonal Care

As a tropical African species, P. wellmani requires warm conditions. Keep the nest area at 24-28°C with a gentle gradient using a heating cable on one side. Room temperature alone is often insufficient. They do not require hibernation [3].

Behavior and Colony Dynamics

Workers are active foragers with a moderate temperament. They defend their nest if threatened and can spray formic acid as a defense, but they lack a sting. Colony growth is moderate, and foraging patterns establish once settled [3].

Frequently Asked Questions

How long does it take for Polyrhachis wellmani to produce first workers?

First workers typically appear in 8-12 weeks under optimal warm conditions, inferred from related Polyrhachis species [3].

What do Polyrhachis wellmani ants eat?

They are omnivorous. Offer sugar water or honey constantly, plus protein sources like dead insects 2-3 times weekly [3].

What temperature do Polyrhachis wellmani ants need?

Keep them at 24-28°C with a temperature gradient so workers can self-regulate [3].

Are Polyrhachis wellmani good for beginners?

They are rated as medium difficulty due to limited specific biology data and warmth requirements [3].

How big do Polyrhachis wellmani colonies get?

Colonies likely reach up to several hundred workers, based on related Polyrhachis species [3].

Can I keep multiple Polyrhachis wellmani queens together?

Colony structure is unconfirmed. Based on related patterns, they likely form single-queen colonies, but combining queens is not recommended [3].

Do Polyrhachis wellmani need hibernation?

No, as a tropical species, they do not require hibernation and should be kept warm year-round [3].

When should I move Polyrhachis wellmani to a formicarium?

Keep founding colonies in a test tube setup. Move to a formicarium once the colony reaches 20-30 workers or when crowded [3].

Why is my Polyrhachis wellmani colony declining?

Common causes include temperatures below 24°C, low humidity, insufficient protein, or parasites from wild-caught colonies. Check warmth and food [3].

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References

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This caresheet is licensed under CC BY-SA 4.0 .