Dolichoderus formosus

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southern Australia (south-western Western Australia and south-central coastal South Australia). Found in mallee and scrub habitats, nesting under rocks or in soil ^[2][3].
• Colony Type: Colony structure is unconfirmed. All Australian Dolichoderus species are endemic to Australia ^[3].
• Size & Growth:
  • Queen: Size data unavailable, queens are winged and larger than workers ^[2]
  • Worker: Size data unavailable, head measurements (HL 1.05-1.15mm, HW 0.84-0.95mm) are provided in research but full body length is not ^[2]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown (Development timeline is not directly studied for this species.)
• Antkeeping:
  • Temperature: Keep at room temperature around 20-26°C. Based on southern Australian distribution (mediterranean climate), they prefer moderate temperatures.
  • Humidity: Moderate humidity. These ants nest under rocks in scrub habitats, suggesting they tolerate drier conditions than rainforest species. Keep nest substrate lightly moist but allow some drying between waterings.
  • Diapause: Unknown, southern Australian species may require a mild winter rest period, but specific requirements are unconfirmed.
  • Nesting: Nests in soil under rocks or in rotten wood in the wild ^[3]. In captivity, a naturalistic setup with a dirt chamber and flat stone or a Y-tong/plaster nest works well.
• Behavior: Workers are diurnal (active during the day) and are general scavengers. They also tend aphids and other Hemiptera for honeydew ^[3]. They often forage in columns on the ground or on low vegetation and trees ^[3]. They are not aggressive but may spray formic acid when threatened. Escape risk is moderate, their small size means they can slip through loose connections.
• Common Issues: small size means escape prevention must be good, check all connections and use tight-fitting lids, colonies may be slow to establish, avoid disturbing founding queens, dry conditions can cause brood death, monitor substrate moisture carefully, wild-caught colonies may have parasites, quarantine and observe new colonies, they forage in columns so need clear pathways to food sources

Housing and Nest Setup

Dolichoderus formosus can be kept in various setups. In the wild, they nest under rocks or in soil, sometimes in rotten wood ^[3]. For captivity, a naturalistic setup with a dirt chamber and flat stone on top works well, this mimics their natural nesting under rocks. Alternatively, a Y-tong nest or plaster nest with dirt fill provides good visibility. Provide an outworld connected by tubing for foraging. Use a test tube with water reservoir as a humidity source, placed near but not directly on the nest. Because workers forage in columns in the wild, ensure there are clear paths in the outworld for them to travel ^[3].

Feeding and Diet

These ants are general scavengers and will accept a variety of foods. In nature, they scavenge for dead insects and tend aphids and other Hemiptera for honeydew ^[3]. In captivity, offer protein sources like small crickets, mealworms, or other small insects twice weekly. Sugar water, honey, or diluted jam can be offered as an energy source. Since they are generalists, they are not difficult to feed. Remove uneaten food after 24-48 hours to prevent mold. Fresh water should always be available.

Temperature and Seasonal Care

Keep Dolichoderus formosus at moderate temperatures around 20-26°C. Their native range in southern Australia has a mediterranean climate with mild winters and warm summers, so they prefer temperatures on the cooler side compared to tropical species. Room temperature is often suitable. If you need to warm the nest, use a heating cable on one side of the nest (placed on top, not underneath, to avoid drying) to create a gentle gradient. Do not let temperatures drop below 5°C or rise above 30°C.

Behavior and Foraging

Workers are diurnal, meaning they are most active during daylight hours ^[3]. They forage in columns, this is a distinctive behavior where workers follow each other in lines rather than foraging individually ^[3]. They can forage both on the ground and on low vegetation and trees ^[3]. This column-foraging behavior means they will readily use any tubing or bridges you provide to connect nest and outworld. They are not particularly aggressive and will flee rather than fight when threatened. Like other Dolichoderus species, they can spray formic acid as a defense, though this is a minor irritant to humans.

Colony Establishment

When acquiring a colony, you may start with a single queen or a small colony with workers. The first workers (nanitics) will be smaller than normal workers. Colonies grow once established. Be patient during the founding stage, do not disturb the queen's chamber. Provide a small amount of food near the founding chamber once workers emerge, but do not overfeed.

Handling and Temperament

Dolichoderus formosus is not an aggressive species. Workers are quick-moving and will typically flee when the nest is disturbed. They can spray formic acid as a defense mechanism, which may cause minor skin irritation but is not dangerous to humans. When handling, move slowly and avoid sudden movements. They are not suitable for hands-on interaction but are fascinating to observe, especially their column-foraging behavior.

Frequently Asked Questions

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References