Zasphinctus steinheili

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Eastern Australia, including Queensland, New South Wales, Victoria, and Tasmania. Found in sclerophyll forest communities and rainforest areas at elevations from 200 to 1200 m ^[1][5].
• Colony Type: Polygynous colonies with multiple ergatoid (wingless) queens. Studies have documented 20 ergatoid queens from 3 colonies, of which 16 were mated and fully fertile ^[1]. Queens are wingless and serve as replacement reproductives within the colony.
• Size & Growth:
  • Queen: Ergatoid queens are wingless, their size has not been explicitly measured in available literature ^[1]
  • Worker: Around 4-6mm estimated based on related species ^[1]
  • Colony: 100-500 workers ^[2]
  • Growth: Moderate
  • Development: Unknown, no specific development data available for this species (Development time is unknown. Related doryline ants show phasic reproduction, but specific timing for Zasphinctus steinheili has not been studied.)
• Antkeeping:
  • Temperature: Based on their temperate Australian climate, maintain at 22-26°C. Avoid temperatures above 30°C. Use a heating cable on one side to create a gradient if needed.
  • Humidity: Keep the nest substrate moist but not waterlogged. They nest in soil, so provide a moisture gradient with some drier areas to allow self-regulation.
  • Diapause: Likely, as a temperate species from southern Australia, they probably need a mild winter rest period. Reduce temperature to 15-18°C for 2-3 months during winter. Reduce feeding during this time ^[5].
  • Nesting: Soil-nesting species ^[2]. Use a naturalistic setup with moist soil or a Y-tong/plaster nest with chambers scaled to their size. Provide dark, humid nest chambers.
• Behavior: These ants are active predators that organize group forays to raid other ant nests ^[3][1]. They use chemical secretions to panic defending ants ^[1]. They are not aggressive toward humans but will defend their nest vigorously. Escape risk is moderate, workers are under 5mm and can squeeze through small gaps, so use standard barrier methods. Workers are moderately fast-moving and investigate their outworld thoroughly. They have a metatibial gland that produces secretions likely used in communication ^[4].
• Common Issues: predatory nature requires constant live prey, colonies decline if underfed, escape prevention is important, workers can squeeze through small gaps when motivated, humidity balance is critical, too wet causes mold, too dry causes desiccation, wild-caught colonies may carry parasites that can devastate captive colonies

Housing and Nest Setup

Zasphinctus steinheili nests in soil in the wild, so a naturalistic setup with moist soil works best ^[2]. You can use a Y-tong (AAC) nest or plaster nest with chambers scaled to their medium size. The nest should be kept dark, these ants prefer dim conditions and will be more active in shaded areas of their outworld. Provide a water tube for humidity and mist the outworld occasionally. Since they are predatory, ensure the outworld has enough space for hunting and exploring. Use standard escape prevention like fluon on container edges.

Feeding and Diet

These are obligate predators, they specialize in hunting other ants ^[2][1]. In captivity, you must provide live prey. Small crickets, fruit flies, and other small insects are accepted, but their preferred food is ant brood and adults from other species. Avoid sugary foods as they are not part of their natural diet. Feed small prey items 2-3 times per week, adjusting based on colony size and consumption. Remove uneaten prey after 24 hours to prevent mold. A well-fed colony will be more active and show more raiding behavior.

Temperature and Seasonal Care

Based on their temperate Australian habitat, keep your colony at 22-26°C for optimal activity and development ^[5][1]. Avoid temperatures above 30°C. During winter, provide a mild diapause period, reduce temperature to 15-18°C for 2-3 months. This mimics their natural seasonal cycle. Do not feed heavily during diapause and reduce disturbance. Return to normal temperatures gradually in spring to trigger increased activity and reproduction.

Behavior and Colony Dynamics

Zasphinctus steinheili shows group foraging behavior, a trait shared with army ants but not as extreme ^[3]. Workers conduct raids on other ant colonies, using chemical signals to confuse and panic defenders ^[1]. Colonies are polygynous with multiple ergatoid (wingless) queens ^[1]. This means your colony may have several egg-laying queens simultaneously, which can help colony resilience but also means more resources are needed to support all queens. The presence of multiple queens does not seem to cause aggression within the colony ^[1].

Handling and Temperament

These ants are not aggressive toward keepers and rarely bite. However, they will defend their nest if threatened. Their moderate size and relatively calm demeanor make them manageable for intermediate keepers. Use standard formicarium setup with proper barrier methods. Workers are active foragers and will explore their outworld thoroughly. They are not known for climbing smooth surfaces aggressively, but escape prevention is still important.

Frequently Asked Questions

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References