Cataulacus intrudens

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Eastern and southern Africa, found in Angola, Eswatini, Ethiopia, Kenya, Malawi, Mozambique, Namibia, Somalia, South Africa, Tanzania, Zimbabwe, and Madagascar ^[1]. This is an arboreal species that nests in twigs, branches, and hollow thorns of trees and shrubs in savannah habitats.
• Colony Type: Colony structure is not well documented in scientific literature. The species shows significant variation in worker morphology, some workers have 'worker-shaped' heads while larger individuals develop 'female-shaped' heads with reduced denticulation.
• Size & Growth:
  • Queen: 6.2-7.4mm ^[1]
  • Worker: 4.3-5.1mm ^[1]
  • Colony: Unknown, likely moderate sized colonies typical of Cataulacus genus
  • Growth: Moderate
  • Development: 6-10 weeks (estimated based on typical Myrmicinae development at around 24°C) (Development time is not directly studied for this species.)
• Antkeeping:
  • Temperature: Keep at 22-26°C, these are African arboreal ants from warm savannah habitats.
  • Humidity: Moderate humidity around 50-70%. Being arboreal, they are adapted to drier conditions than ground-nesting ants.
  • Diapause: Likely a short diapause period during the cooler dry season in their African range. Consider a brief winter rest at 15-18°C for 2-3 months if colony shows reduced activity.
  • Nesting: Arboreal nesting, they naturally live in twigs, branches, and hollow thorns. In captivity, they do well in Y-tong (AAC) nests or plaster nests with narrow chambers. Avoid large, open spaces, they prefer tight, enclosed spaces scaled to their body size.
• Behavior: Generally calm and non-aggressive foragers. They are arboreal and spend considerable time on tree bark and branches. Workers are medium-sized and relatively slow-moving. They have a flattened stinger used to smear venom rather than pierce, not particularly painful to humans. Escape prevention should be moderate, they can squeeze through small gaps when determined.
• Common Issues: arboreal nature means they may struggle in ground-based test tube setups, provide climbing structures and elevated foraging areas, wild-caught colonies may have parasites or diseases that can cause colony failure in captivity, their variable morphology may cause confusion, some workers look very different from others in the same colony, colonies may be slow to establish and require patience during the founding phase

Housing and Nest Setup

Cataulacus intrudens is an arboreal ant, which means you need to think vertically rather than horizontally. In the wild, these ants live in hollow twigs, branches, and the swollen thorns of acacia trees. They do best in Y-tong (AAC) nests or plaster nests with narrow, tight chambers that mimic their natural tree-hole homes. Avoid large, open formicarium spaces, these ants feel safest in snug quarters. Provide a test tube water reservoir attached to the nest for humidity, but do not overdo it, arboreal ants are adapted to drier conditions than ground nesters. Include some small climbing structures or branches in the outworld so they can forage naturally up high. Since they are tree-dwellers, they will appreciate some vertical space and bark or twig decorations in their foraging area. ^[1]

Feeding and Diet

Like most Myrmicinae, Cataulacus intrudens is an omnivore that accepts both protein and sugar sources. Feed them standard ant foods like sugar water, honey, or diluted maple syrup for carbohydrates. For protein, offer small insects like fruit flies, small mealworms, or cricket pieces. In their natural habitat, they forage on tree trunks and branches, likely collecting honeydew from aphids and scale insects as well as hunting small arthropods. Feed protein 2-3 times per week and keep sugar water available constantly. Remove uneaten prey after 24-48 hours to prevent mold. These ants are not specialized predators, so they will readily accept most standard ant foods.

Temperature and Seasonal Care

Keep your colony at 22-26°C, which mimics the warm temperatures of their African savannah habitat. A small heating cable on one side of the nest can create a gentle gradient, place it on top of the nest, not underneath, to avoid evaporating water too quickly. Room temperature in most homes should work fine for this species. Regarding winter care, the natural range includes areas with distinct wet and dry seasons. If your colony becomes less active during winter months, you can provide a brief cool period at 15-18°C for 2-3 months. This mimics their natural seasonal cycle and may help trigger breeding activity in spring. However, diapause is not strictly required, many keepers successfully maintain active colonies year-round at room temperature.

Understanding Their Incredible Variation

One of the most fascinating aspects of Cataulacus intrudens is how wildly variable the workers look, so variable that researchers originally described many different species that are now all recognized as one. Workers can have very different head shapes, from the typical worker shape with toothed sides to a female-shaped head that looks more like the queen. Some have strong sculpturing and spines, others are smoother. This variation is not random, larger workers tend to have the female-like features, while smaller workers keep the more typical worker appearance. When keeping this species, do not be alarmed if your workers look quite different from each other. This is completely normal for Cataulacus intrudens and is not a sign of problems. ^[1]

Behavior and Foraging

These ants are relatively calm and not particularly aggressive. They spend much of their time foraging on tree bark and branches in the wild, so they will do most of their activity on elevated surfaces in your setup. Workers are medium-sized and moderately active. They use chemical trails to recruit nestmates to food sources, similar to most Myrmicinae. While they do not have a particularly painful sting, they can defend themselves if threatened using their smear-type stinger. Escape prevention should be standard, they are not tiny ants but can still find their way out through small gaps if your setup is not secure. A standard barrier like fluon on the rim of the outworld should be sufficient. ^[2]

Frequently Asked Questions

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References