Polyrhachis spitteleri

Polyrhachis spitteleri

Polyrhachis spitteleri is a medium-sized arboreal ant found in Central Africa. Workers measure 4.8-5.6mm and are black with lighter brownish appendages. They have distinctive spines on the pronotum and propodeum, with a unique median tubercle between the long curved propodeal spines. The petiole bears four spines of roughly equal size. A notable feature is the thick yellowish waxy hairs covering the alitrunk and gaster, giving them a somewhat fuzzy appearance. This species is completely arboreal, living high in the forest canopy where it has been collected from trees using pyrethrum sampling methods. It belongs to the monista species-group and is closely related to Polyrhachis monista, differing mainly in the presence of the median propodeal prominence.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Central African Republic, Democratic Republic of Congo, and Ghana in the Afrotropical region. Completely arboreal, lives in the forest canopy ^[1].
• Colony Type: Colony structure is unconfirmed. Polyrhachis species are typically monogyne (single queen) but some can be polygyne.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Approximately 5-6mm (estimated from gyne measurements HL 1.42,WL 2.24mm) ^[2]
  • Worker: 4.8-5.6mm ^[1]
  • Colony: Unknown for this species, Polyrhachis colonies often reach several hundred workers ^[1]
  • Growth: Unknown, likely moderate based on typical Polyrhachis patterns
  • Development: Estimated 6-10 weeks at tropical temperatures (based on genus-level data for Polyrhachis) (Development timeline is not directly studied for this species. Estimates based on related arboreal Polyrhachis species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. As a tropical arboreal species from Central Africa, they need warm conditions. A gentle gradient is recommended with a heating cable on one side of the nest.
  • Humidity: Moderate to high humidity (60-80%). Arboreal ants often prefer slightly drier conditions than ground-nesting species, but maintain some moisture. Mist occasionally and provide a water source.
  • Diapause: No diapause required. Being a tropical species, they do not need hibernation. Keep temperatures stable year-round.
  • Nesting: Arboreal ants need vertical space. Use a Y-tong (AAC) nest or naturalistic setup with branches/vines. They do not nest in soil, provide wooden or acrylic structures scaled to their size. Escape prevention is important though they are not extreme escape artists.
• Behavior: Polyrhachis ants are generally calm and not aggressive. As an arboreal species, they are active climbers and will explore vertical spaces. They are not known to sting significantly, their main defense is the spiny protrusions on their body. They likely forage in the canopy for honeydew and small insects. Escape risk is moderate, close-fitting lids and standard barriers are sufficient.
• Common Issues: arboreal nature means standard horizontal nests are unsuitable, they need vertical setups, limited availability in the antkeeping hobby due to specialized collection methods, wild-caught colonies may have parasites or stress from transport, tropical species are sensitive to temperature drops below 20°C, colony growth may be slow due to limited data on optimal care conditions

Housing and Nest Setup

Polyrhachis spitteleri requires an arboreal setup due to its completely tree-dwelling nature. Standard horizontal formicaria are not suitable. Use a Y-tong (AAC) nest with narrow chambers, or create a naturalistic setup with branches, cork bark, or wooden structures that allow climbing. The outworld should include vertical elements like twigs or mesh for them to explore. Ensure the nest has adequate ventilation while maintaining humidity. Escape prevention is important but this species is not as prone to escaping as very small ants, standard barriers like Fluon on smooth surfaces work well. ^[1]

Feeding and Diet

Like most Polyrhachis species, these ants are omnivorous with a preference for sugary substances. Feed them sugar water, honey, or diluted honey regularly. They also need protein sources, offer small insects like fruit flies, small crickets, or mealworms. In the wild, arboreal ants often collect honeydew from aphids and scale insects, so providing a sugar source is important for colony health. Feed protein 2-3 times per week and keep sugar water available at all times. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Climate Care

As a tropical species from Central Africa, Polyrhachis spitteleri needs warm conditions. Keep the nest area at 24-28°C. A heating cable on one side of the nest creates a gentle thermal gradient, allowing the ants to regulate their temperature by moving between warmer and cooler areas. Avoid temperatures below 20°C as this can stress or kill the colony. Room temperature in heated homes (around 22-24°C) is often suitable, but monitor colony activity to ensure they are thriving. No diapause or hibernation is needed, maintain stable tropical conditions year-round.

Humidity Management

Maintain moderate to high humidity around 60-80%. As an arboreal species, they are somewhat more tolerant of drier conditions than ground-nesting ants, but still need access to moisture. Use a water reservoir in the nest setup and mist the outworld occasionally. The nest material should be slightly moist but not wet. Watch for condensation, some moisture is good but excessive condensation can indicate too much water. Provide a dry area within the nest setup so ants can choose their preferred humidity zone.

Behavior and Colony Dynamics

Polyrhachis spitteleri is a calm, non-aggressive species. Workers are active climbers that will readily explore vertical spaces. The spines on their body (pronotal, propodeal, and petiolar) serve as a physical defense against predators. They are not known to sting humans significantly. Colonies likely grow gradually, expect slow growth in the first few months as the queen raises the first brood (nanitics). Once established, colonies can reach several hundred workers over time. Queens are chunky and well-provisioned for claustral founding, sealing themselves in to raise the first workers without leaving the nest. ^[1]

Frequently Asked Questions

References