Dorymyrmex goetschi

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Chile, from Antofagasta to Volcán Villarrica, in arid and desert regions with high solar incidence and sandy soils ^[2][3]
• Colony Type: Polydomous (multiple connected nest entrances). Queen number is unclear, some colonies have a queen, but polygyny is not confirmed ^[1][5].
• Size & Growth:
  • Queen: Unknown – not directly measured in available research
  • Worker: Monomorphic, no precise measurements available in research. Workers are larger in northern populations (Copiapó) and smaller further south ^[4].
  • Colony: A few hundred workers ^[1].
  • Growth: Moderate (estimated, no direct data)
  • Development: Not directly studied for this species. Based on related Dolichoderinae, an estimate of 6-10 weeks is reasonable but unconfirmed. (Development timeline depends on temperature, optimal temperatures likely accelerate growth.)
• Antkeeping:
  • Temperature: Keep between 20-30°C. Workers remain active from 16.4°C to 39.0°C, with peak foraging speed at 28°C (2.28 cm/s). Provide a temperature gradient so ants can thermoregulate. Avoid sustained temperatures above 40°C ^[6][1].
  • Humidity: Low to moderate in the outworld, but provide a slightly moister area in the nest for brood development. They are desert-adapted, so avoid waterlogging. A small watering tube or moist section in the substrate works well.
  • Diapause: Likely needed due to temperate Chilean range. No specific data, provide a gradual reduction to 10-15°C for 2-3 months during winter. Observe colony response.
  • Nesting: Best kept in naturalistic setups with deep sandy substrate (they nest 30-50cm deep in the wild) or in Y-tong/plaster nests with deep chambers. Provide a dry, warm outworld ^[1].
• Behavior: Workers are calm and non-aggressive. They forage solitarily or in short-term trails, collecting seeds, dead insects, and small prey ^[1][5]. Workers can carry items up to 3.5 times their body weight ^[3]. They close the nest entrance when soil temperature reaches 45°C to protect the colony ^[1]. Escape risk is moderate to high due to small size – ensure tight barriers.
• Common Issues: colony queen status uncertain – if introducing a new queen, monitor closely, colonies may be queenless but still function for a while., polydomous nesting means they may establish multiple nest entrances – provide adequate space., desert species sensitive to excess moisture – avoid damp conditions that cause mold or fungus., workers close the nest entrance in extreme heat – keep temperatures below 40°C to avoid stress., small size (body mass ~1.6 mg) increases escape risk – use very fine mesh or oil barriers., slow colony growth compared to tropical species may frustrate beginners, patience required.

Housing and Nest Setup

Dorymyrmex goetschi is a desert-dwelling species that prefers dry, warm conditions with access to sunny areas. In the wild, they nest 30-50 cm underground in sandy soils and construct characteristic earth hillocks around their entrances ^[1]. For captivity, a naturalistic setup with deep sandy substrate works well, or a Y-tong/plaster nest with chambers scaled to their small size. They may be polydomous, meaning they maintain multiple connected entrances – provide enough space for this behavior ^[5]. A test tube setup can work for founding colonies, but transfer to a more spacious formicarium as the colony grows. Ensure the nest area remains dry while providing a water source in the outworld.

Feeding and Diet

These are harvester ants that collect seeds, small prey, and dead insects in the wild ^[1][5]. Workers can carry items up to 3.5 times their body weight, making them efficient foragers ^[3]. In captivity, offer a varied diet including small seeds (grass seeds work well), protein sources like mealworms or crickets, and occasional sugar water or honey. They are omnivorous but lean toward seed-harvesting. Feed protein 2-3 times weekly and keep sugar water available. Remove uneaten food promptly to prevent mold.

Temperature and Heating

Dorymyrmex goetschi is adapted to extreme temperature conditions in Chilean deserts. Workers remain active from 16.4°C to 39.0°C, with peak foraging activity around 28°C when they move at 2.28 cm/s ^[6]. In captivity, maintain temperatures between 20-30°C, providing a gradient so ants can choose their preferred zone. They close their nest entrance when soil temperature reaches 45°C – avoid temperatures above 40°C to prevent stress or mortality ^[1]. Room temperature within this range is suitable, a heating cable on one side of the nest can create the needed gradient.

Foraging Behavior

Workers forage solitarily or form short-term trails to food patches up to 2 meters from the nest ^[1]. They discover food patches approximately 19 minutes after leaving the nest, and successful prey removal begins around 46 minutes ^[1]. Their foraging success improves with experience – initial phase capture rates are 5-7 times lower than later phases as workers learn patch locations ^[1]. They communicate through antennal contacts, more contacts correlate with higher prey capture success ^[1]. This learning behavior means that consistent feeding locations help colony efficiency.

Colony Structure

Colonies consist of a few hundred workers ^[1]. Queens have been found in some colonies, but it is not clear if multiple queens coexist in the same nest. Some colonies lack queens, suggesting queen loss may occur, interestingly, queen presence does not affect foraging success or locomotion speed ^[1]. They are likely polydomous, with multiple connected nest entrances ^[5]. Queen size has not been measured. When keeping this species, do not assume polygyny – observe the colony's behavior.

Frequently Asked Questions

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References