Dolichoderus kathae

Dolichoderus kathae

Dolichoderus kathae is a small, slender ant native to semi-arid South Australia. Workers measure around 3-4mm with a distinctive yellowish-red head and dark body. The pronotum and propodeum lack spines, and the body surface has a matte, finely reticulate texture. This species belongs to the Dolichoderinae subfamily and is part of the australis species group. It was formally described in 2013 and is known only from Callitris woodlands in South Australia, making it a relatively rare and geographically restricted species ^[1].

These ants are diurnal foragers that travel in columns along the ground and up into low vegetation. Like other Dolichoderus species, they tend aphids and other Hemiptera for honeydew, making them important in their ecosystem for honeydew collection and as general scavengers. They nest in soil under rocks or in rotting wood ^[2].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Semi-arid South Australia, specifically Callitris woodlands. This is a dry, open woodland habitat with sandy or rocky soils ^[1][2].
• Colony Type: Likely monogyne (single queen) based on typical Dolichoderus patterns. Colony structure is not directly documented for this specific species.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 6-8mm based on related Dolichoderus species ^[1].
  • Worker: Workers are 3-4mm (HW 0.86-0.92mm) ^[1].
  • Colony: Estimated moderate-sized colonies based on genus patterns, likely several hundred workers.
  • Growth: Moderate, typical for Dolichoderus genus.
  • Development: Estimated 6-10 weeks based on related Dolichoderus species development patterns. Not directly studied for this species. (Development time is inferred from genus-level data, direct measurements are unavailable.)
• Antkeeping:
  • Temperature: Keep at 22-26°C. As a semi-arid Australian species, they prefer warm conditions but not extreme heat. A gentle temperature gradient allows them to regulate ^[2].
  • Humidity: Low to moderate humidity. Semi-arid habitat means they prefer drier conditions, aim for 40-60% relative humidity. Allow the nest to dry out between waterings rather than keeping it constantly moist.
  • Diapause: Likely requires a mild winter rest period (diapause) of 2-3 months at 10-15°C, typical for Australian temperate ants. Not directly documented for this species.
  • Nesting: Nests in soil under rocks or in rotting wood in the wild. In captivity, a Y-tong (AAC) or plaster nest works well. Provide some dry areas alongside moister zones. Avoid overly humid conditions.
• Behavior: Workers are diurnal and active foragers. They form foraging columns and will climb vegetation to access honeydew sources. They are general scavengers and will accept protein foods and sugar sources. Workers are not particularly aggressive but may spray formic acid when threatened, a common defense in Dolichoderinae. Escape risk is moderate due to their small size, standard barriers are usually sufficient. They are faster-moving ants that stay active during daylight hours.
• Common Issues: overhumidity is the most common problem, these ants come from semi-arid conditions and mold kills colonies in overly damp setups, small colony slow growth can frustrate keepers, they develop moderately and need patience through the founding stage, escape prevention matters despite moderate size, use proper barriers and avoid large gaps in tubing, winter die-off can occur if diapause conditions are wrong, provide a cool but not cold rest period, limited availability makes this species hard to find, source from reputable Australian antkeepers

Housing and Nest Setup

Dolichoderus kathae does well in a Y-tong (AAC) nest or a plaster formicarium. Since they come from semi-arid Australian woodlands, they need a nest that can dry out between waterings. Avoid setups that stay constantly humid, this causes mold and kills colonies. Provide a water reservoir but allow the substrate to partially dry between rehydration. An outworld with some vertical space lets them forage up into vegetation, which they do in the wild. Use test tubes for the founding stage, transitioning to a proper nest once the colony reaches 20-30 workers. ^[2][1]

Feeding and Diet

Like other Dolichoderus species, D. kathae is a general scavenger that also tends hemipteran insects for honeydew. In captivity, offer a varied diet: sugar water or honey as an energy source, and protein foods like small insects (fruit flies, small mealworms, crickets) twice weekly. They will also accept cat food or other protein-based foods. Since they naturally forage in columns, place food in the outworld and watch them recruit nestmates. Fresh food should be removed within 24-48 hours to prevent mold. ^[2]

Temperature and Seasonal Care

Maintain temperatures between 22-26°C for optimal activity and brood development. As a semi-arid species from South Australia, they can tolerate warmer conditions but avoid overheating. During winter (Australian winter, roughly June-August), reduce temperatures to 10-15°C for a 2-3 month diapause period. This mimics their natural seasonal cycle and helps maintain colony health. Do not keep them warm year-round, the winter rest is important for long-term colony success. ^[2][1]

Behavior and Foraging

Workers are diurnal and form foraging columns, both on the ground and climbing into low vegetation. This is an active species that constantly moves throughout the day. They are not particularly aggressive toward keepers but will defend the nest if threatened. Like all Dolichoderinae, they can spray formic acid as a defense mechanism, this is harmless to humans but worth knowing. They are faster-moving ants that benefit from having an outworld large enough to explore. Their small size means they can squeeze through small gaps, so check your setup for escape routes. ^[2]

Frequently Asked Questions

References