Dorymyrmex goetschi

Dorymyrmex goetschi

Dorymyrmex goetschi is a Chilean harvester ant known for its distinctive red head and thorax contrasting with a black abdomen. Workers are monomorphic (all the same size) and weigh approximately 1.6 mg. This species is strictly found in Chile, ranging from Antofagasta in the north to Volcán Villarrica in the south. They build characteristic crater nests in open, sunny areas with sandy soils, creating small earth hillocks around their nest entrances. Colonies contain a few hundred workers and are polydomous, meaning they maintain multiple connected nest entrances. These ants are active foragers that collect seeds, small prey, and dead insects, with a foraging range of about 2 meters from the nest entrance.

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Chile, from Antofagasta to Volcán Villarrica, in arid and desert regions with high solar incidence and sandy soils ^[1][2]
• Colony Type: Polydomous colonies with a few hundred workers, queens found in multiple colonies suggesting multi-queen structure is possible ^[3][4]
  • Colony: Polygyne
• Size & Growth:
  • Queen: Unknown, not directly measured in available research
  • Worker: Monomorphic workers, larger in northern populations (Copiapó ~30°S) and smaller further south ^[5]
  • Colony: A few hundred workers ^[3][4]
  • Growth: Moderate, estimated based on related Dolichoderines
  • Development: 6-10 weeks, estimated from related species in Dolichoderinae (Development timeline not directly studied for this species, estimate based on genus-level data)
• Antkeeping:
  • Temperature: Keep between 20-30°C. They are active from 16.4°C to 39.0°C, with optimal foraging around 28°C when they reach speeds of 2.28 cm/s ^[6]. Provide a temperature gradient allowing them to thermoregulate.
  • Humidity: Low to moderate, these are desert/arid zone ants that tolerate dry conditions. Provide a dry outworld with a moist nesting area for brood development.
  • Diapause: Likely, as a Chilean species from temperate latitudes, they probably require a winter rest period. Further research needed.
  • Nesting: Best kept in naturalistic setups with sandy substrate or Y-tong nests. They nest 30-50cm deep in the wild and prefer open, sunny areas ^[3]. Provide deep substrate for nesting chambers.
• Behavior: Generally calm and non-aggressive. Workers forage solitarily or in short-term trails, collecting seeds and small insects. They close their nest entrance when soil temperature reaches 45°C, showing adaptation to hot conditions ^[3]. Workers can carry items up to 3.5 times their body weight ^[2]. Escape risk is moderate, use standard barrier methods.
• Common Issues: colonies may be polygynous meaning multiple queens, if introducing a new queen to an existing colony, monitor for aggression, polydomous nesting means they may establish multiple nest entrances, provide adequate space, desert species sensitive to excess moisture, avoid damp conditions that cause mold, workers close nest in extreme heat, ensure stable temperatures below 40°C, slow colony growth compared to tropical species may frustrate beginners

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 crater mounds around their entrances. 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 are polydomous, meaning they may maintain multiple entrances, provide enough space for this behavior. 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. ^[3][5][2]

Feeding and Diet

These are harvester ants that collect seeds, small prey, and dead insects in the wild ^[3][4]. Workers can carry items up to 3.5 times their body weight, making them efficient foragers ^[2]. 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 the Chilean desert. 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. 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 ^[3]. They discover food patches approximately 19 minutes after leaving the nest, and successful prey removal begins around 46 minutes ^[3]. Their foraging success improves with experience, initial phase capture rates are 5-7 times lower than in later phases as workers learn patch locations ^[3]. They communicate through antennal contacts, with more contacts correlating to higher prey capture success ^[3]. This learning behavior means consistent feeding locations help colony efficiency.

Colony Structure

Colonies consist of a few hundred workers and contain multiple queens, queens were found in 4 out of 7 colonies studied ^[3]. This suggests a polygynous (multi-queen) colony structure, which is common in Dorymyrmex species. They are polydomous, meaning they maintain multiple connected nest entrances in the wild ^[4]. Queen size has not been directly measured in available research. When keeping this species, you may encounter multiple queens in established colonies, this is normal behavior for the species.

Frequently Asked Questions

References