Dorymyrmex richteri

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to northern Patagonia, Argentina and southern Chile. Found in roadside steppe and forest edge habitats in the Nahuel Huapi National Park region ^[1]. Both sides of the Andes mountains ^[2].
• Colony Type: Colony structure is unconfirmed for this specific species.
• Size & Growth:
  • Queen: Size data unavailable, inferred from Dorymyrmex genus (~5-8mm)
  • Worker: Size data unavailable, inferred from Dorymyrmex genus (~3-5mm)
  • Colony: Up to several hundred workers, estimated from related species
  • Growth: Moderate
  • Development: Estimated 6-10 weeks at optimal temperature based on genus patterns (Timeline not directly studied for this species)
• Antkeeping:
  • Temperature: Keep at room temperature around 18-24°C. As a Patagonian species from southern South America, they prefer cooler conditions than tropical ants.
  • Humidity: Moderate humidity around 50-70%. They inhabit steppe and forest edge areas, so provide some moisture but avoid overly damp conditions.
  • Diapause: Yes, as a Patagonian species, they require a winter dormancy period. Reduce temperature to around 10-15°C for 2-3 months during winter (roughly November-February in the Southern Hemisphere).
  • Nesting: In the wild, they nest in soil under stones or in small ground cavities. In captivity, a standard test tube setup works well for founding colonies. Once established, they can be moved to a formicarium with soil or plaster nesting medium.
• Behavior: These ants are relatively docile and not aggressive toward keepers. They are active foragers that readily search for food. Their small size means they can escape through tiny gaps, use fine mesh and barrier gel on edges. They are known to tend aphids in the wild, so they will readily accept sugar sources. They do not have a functional stinger, so they pose no sting risk to humans.
• Common Issues: limited research data means care requirements are estimated from genus patterns, monitor colony response and adjust accordingly, small size makes escape prevention critical, use fine mesh barriers and seal all gaps, Patagonian origin means they need cooler temperatures than typical tropical ants, avoid overheating, winter dormancy is required, skipping diapause may stress or weaken colonies over time, honeydew-feeding behavior means sugar sources are readily accepted

Natural History and Distribution

Dorymyrmex richteri is native to the Patagonia region of southern South America, specifically Argentina and Chile. The species was originally described by Forel in 1911 as a subspecies of Dorymyrmex tener, later was synonymized with D. antarcticus, and then revived as a separate species in 1976 ^[3]. They are found on both sides of the Andes mountains, in habitats ranging from roadside steppe to forest edges. The species is part of a clade that includes Dorymyrmex tener and is closely related to D. goetschi and D. hunti ^[2]. In their natural habitat, they play a role in the local ecosystem by tending aphids and participating in trophic chains ^[1].

Feeding and Diet

In the wild, Dorymyrmex richteri exhibits trophobiotic behavior, meaning they tend aphids to collect honeydew. They attend the aphid Brachycaudus cardui on thistle plants (Carduus nutans and Onopordum acanthium), protecting the aphids in exchange for the sweet honeydew the aphids excrete ^[1]. This makes them readily accepting of sugar sources in captivity, offer sugar water, honey water, or diluted maple syrup. They will also accept protein sources like small insects (fruit flies, pinhead crickets, mealworms). Feed protein prey 2-3 times per week and keep a sugar source constantly available. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Seasonal Care

As a Patagonian species from southern South America, Dorymyrmex richteri prefers cooler temperatures than many common tropical ant pets. Keep the nest area at room temperature, ideally between 18-24°C. They can tolerate brief periods outside this range but avoid prolonged heat exposure. During winter (roughly November-February in their native Southern Hemisphere), they benefit from a diapause period where temperatures are reduced to around 10-15°C. This rest period is important for colony health and may trigger reproductive behavior in the following season.

Housing and Nesting

For founding colonies, a standard test tube setup works well. Fill a test tube with water, plug the end with cotton, and place the queen in the tube. Keep it in a dark, quiet location at room temperature. Once the first workers (nanitics) have hatched and the colony has grown to 20-30 workers, you can consider moving them to a formicarium. They do well in naturalistic setups with soil or plaster as nesting medium, which helps maintain moderate humidity. Provide a shallow water foraging area and ensure the outworld has good access to the nest. Because of their small size, check that any connections between nest and outworld have no gaps larger than 2mm.

Behavior and Temperament

Dorymyrmex richteri workers are relatively docile and not prone to aggression. They are active foragers that will readily explore their enclosure searching for food. They lack a functional stinger, so they pose no danger to keepers. Their small size means they are excellent escape artists, always use fine mesh on any ventilation holes and apply barrier gel or fluon around the edges of the enclosure. They are social ants that benefit from having a queen and will form cohesive colonies. In the wild, they can be found tending aphids alongside other ant species, showing they can coexist with other insects in their territory ^[1].

Frequently Asked Questions

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References