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

Nylanderia tasmaniensis

Non-Parasitic Queen No Gamergate
Sci. Name
Nylanderia tasmaniensis
Tribe
Lasiini
Subfamily
Formicinae
Author
Forel, 1913
Distribution
Found in 2 countries
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Introduction

Nylanderia tasmaniensis is a small ant native to Tasmania and southeastern Australia, with established populations in New Zealand . Workers measure approximately 2-3 mm and display erratic, rapid foraging patterns typical of 'crazy ants' . They are dark brown to black with a slender build, belonging to the Formicinae subfamily . In their natural habitat, they nest in soil, under stones, and in decaying wood in temperate forest edges and disturbed areas .

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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: Native to Tasmania and southeastern Australia, with introduced populations in New Zealand. Found in temperate forest edges, sclerophyll woodland, and disturbed areas, nesting in soil, under stones, and in rotting wood [1].
  • Colony Type: Colony structure is unconfirmed. Based on Nylanderia genus patterns, likely single-queen colonies, though multiple-queen arrangements are possible in some species.
  • Size & Growth:
    • Queen: Size data unavailable, no total length measurements found in literature.
    • Worker: 2-3 mm [1]
    • Colony: Up to several hundred workers, estimated based on Nylanderia genus patterns
    • Growth: Moderate
    • Development: Estimated 6-10 weeks from egg to worker, inferred from related Formicinae species (Development time is not specifically documented for this species, estimate based on genus-level data for similar temperate ants)
  • Antkeeping:
    • Temperature: Keep at room temperature, roughly 18-24°C, based on temperate origin [1]. A slight gradient is ideal but not required.
    • Humidity: Keep nest substrate slightly moist but allow drying between waterings, adapting to varying conditions [1].
    • Diapause: Likely requires winter diapause, reduce temperature to 10-15°C for 2-3 months during winter, inferred from temperate origin.
    • Nesting: Accepts test tubes for founding, and Y-tong or plaster nests for established colonies, with moist substrate and dry areas [1].
  • Behavior: These ants are active and fast-moving with erratic foraging patterns, living up to their 'crazy ant' name [1]. They are not aggressive and typically flee from disturbance. Workers are omnivorous, foraging for honeydew, small insects, and nectar. Their small size (2-3 mm) requires attention to escape prevention, they can slip through small gaps [1].
  • Common Issues: small size makes escape likely without fine mesh barriers, limited specific care data means keepers must adapt based on colony behavior, winter dormancy requirements are not fully understood, observe colony for signs of seasonal slowing, wild-caught colonies may carry parasites that affect captive health, queen number and colony structure in captivity is not well documented

Housing and Nest Setup

Nylanderia tasmaniensis adapts well to various captive setups. For newly caught queens, a test tube setup works well, fill a test tube one-third with water, plug with cotton, and place the queen in darkness [1]. For established colonies, Y-tong nests, plaster nests, or naturalistic setups with soil/sand all work [1]. Provide a water tube and a foraging area. Because workers are only 2-3 mm, ensure connections between nest and outworld have no gaps, use fluon barriers to prevent escapes [1].

Feeding and Diet

These ants are omnivorous. They readily accept sugar sources like honey water or sugar water, and protein such as small insects like fruit flies or mealworms [1]. Feed protein twice weekly and keep sugar sources available constantly. Remove uneaten prey after 24-48 hours to prevent mold [1].

Temperature and Seasonal Care

Being from temperate regions, these ants prefer cooler conditions. Keep at room temperature (18-24°C) with a slight gradient if possible [1]. They likely require winter diapause, reduce temperature to 10-15°C for 2-3 months during winter if the colony shows slowing. Do not feed during dormancy.

Behavior and Handling

Nylanderia tasmaniensis exhibits erratic, rapid movement typical of crazy ants [1]. Workers forage individually or in small groups and are not aggressive, fleeing from threats [1]. They have mild formic acid spray as defense, but it poses minimal threat to humans. Their small size means escape prevention is critical, use fine mesh and check for gaps regularly [1].

Colony Development

Specific development data is not documented. Based on related Formicinae ants, expect 6-10 weeks from egg to first worker at room temperature. The queen remains sealed during founding until workers emerge. Initial colonies grow slowly, then accelerate once established. Maximum colony size is estimated up to several hundred workers based on genus patterns. Colonies are likely single-queen, but this is unconfirmed for this species.

Frequently Asked Questions

How long does it take for Nylanderia tasmaniensis to produce first workers?

Development time is not specifically documented, but based on related Formicinae species, expect 6-10 weeks from egg to first worker at room temperature (18-24°C). Initial founding can feel slow, be patient as the queen raises her first nanitic workers alone.

What temperature do they need?

Keep them at room temperature, roughly 18-24°C, based on their temperate origin [1]. A slight temperature gradient is ideal but not required.

Do they need hibernation or diapause?

Likely yes, given their origin in Tasmania and New Zealand, they probably need a winter rest period. Reduce temperature to 10-15°C for 2-3 months during winter if your colony shows seasonal slowing.

Can I keep multiple queens together?

Not recommended, combining unrelated queens of this species has not been documented. Based on genus patterns, they likely form single-queen colonies. If you catch multiple founding queens, house them separately.

Are they good for beginners?

They are moderately difficult, not the easiest starter species but not challenging either. Their small size requires attention to escape prevention, and winter dormancy adds complexity. They are more forgiving of temperature variations than tropical species [1].

What do they eat?

Omnivorous, offer sugar water or honey constantly, and protein (small insects like fruit flies or mealworms) roughly twice weekly [1]. They will also collect honeydew if aphids are available.

How big do colonies get?

Colony size is not specifically documented, but based on typical Nylanderia patterns, expect up to several hundred workers at maturity. Growth is moderate over several years.

When should I move them to a formicarium?

Wait until you have 20-30 workers before moving from a test tube setup. Ensure the new nest has appropriate chamber sizes for their small workers and maintains proper humidity.

Why are my ants dying?

Common causes include: escape through small gaps (check your setup), improper humidity (too wet or too dry), stress from disturbance during founding, or parasites from wild-caught colonies. Review each parameter and make one change at a time [1].

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References

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This caresheet is licensed under CC BY-SA 4.0 .