Dorymyrmex planidens

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Argentina and Chile in the Neotropical Region. These ants inhabit open, sunny areas with sandy or well-drained soils, typically in arid to semi-arid environments ^[1]. They construct nests in open ground, often creating distinctive conical mounds that give pyramid ants their common name.
• Colony Type: Colony structure is unconfirmed for this species. Based on typical Dorymyrmex patterns, likely single-queen colonies.
• Size & Growth:
  • Queen: Size data unavailable, inferred from Dorymyrmex genus (~6-8mm)
  • Worker: Size data unavailable, inferred from Dorymyrmex genus (~2-4mm)
  • Colony: Up to several hundred workers, estimated based on genus patterns
  • Growth: Moderate, typical for dolichoderine ants
  • Development: Development time unconfirmed for this species (Timing inferred from related Dolichoderinae species, actual duration may vary based on temperature conditions)
• Antkeeping:
  • Temperature: Keep at 24-28°C (warm room temperature). They tolerate higher temperatures well given their arid natural habitat. A heating cable on one side of the nest can create a gradient if needed.
  • Humidity: Low to moderate. These are desert-adapted ants that prefer drier conditions. Keep nest substrate moderately dry with just slight moisture. Avoid damp, stagnant conditions.
  • Diapause: Likely required during winter months given their temperate southern hemisphere distribution. Reduce temperature to 10-15°C for 2-3 months during winter.
  • Nesting: Best kept in naturalistic setups with sandy substrate or in Y-tong/plaster nests with dry to moderately moist conditions. They prefer nesting in material they can excavate and move, a sand-soil mix works well.
• Behavior: Dorymyrmex planidens are active, fast-moving ants with alert foraging behavior. They are not particularly aggressive toward humans but will defend their nest vigorously. Workers are diligent foragers, actively searching for nectar, honeydew, and small insects. They lack a functional sting and rely on smear defense, secreting defensive chemicals when threatened. Their small size means escape prevention is important, use fine mesh barriers and tight-fitting lids. They are diurnal, most active during warmer parts of the day.
• Common Issues: escape prevention is critical due to small worker size, they squeeze through tiny gaps, colonies may struggle if humidity is too high, these are arid-adapted ants, winter diapause is likely required but timing depends on your hemisphere, limited availability in the antkeeping hobby since they're not commonly traded, slow colony growth in the first year may frustrate beginners

Nest Preferences and Setup

Dorymyrmex planidens naturally nests in open, sandy areas where they can construct their characteristic conical mounds. In captivity, they do well in naturalistic setups with a sandy soil substrate that allows them to excavate and move particles, this connects to their psammophore, the hair brush under their head used for sand transport ^[2]. A mix of play sand and fine soil works well as a substrate. Alternatively, Y-tong nests with narrow chambers can work, though these desert-adapted ants prefer drier conditions than many other ants. Whatever nest type you choose, ensure excellent escape prevention since their small size allows them to squeeze through standard gaps. Provide a water tube as a hydration source, but don't over-moisten the nest area.

Feeding and Diet

Like other Dorymyrmex species, these ants are omnivorous with a preference for sweet liquids. Offer sugar water, honey, or diluted maple syrup as a constant carbohydrate source. For protein, provide small insects like fruit flies, small mealworms, or cricket pieces. They are active foragers, so place food in the outworld where they can find it easily. In the wild, they likely consume nectar from flowers and honeydew from aphids or scale insects, so occasional offering of sweet treats mimics their natural diet. Feed protein prey 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24 hours to prevent mold.

Temperature and Seasonal Care

Dorymyrmex planidens comes from Argentina and Chile, regions with distinct seasons. Keep the nest at 24-28°C for optimal brood development, they are warm-adapted ants that tolerate heat well given their arid habitat. Room temperature in most homes should suffice, but you can use a heating cable on one side of the nest to create a gentle gradient if needed. During winter (roughly November-February in the Southern Hemisphere), reduce temperatures to 10-15°C to allow for diapause. If you're in the Northern Hemisphere, simulate winter during your local winter months. This rest period is important for colony health and triggering reproductive behavior the following spring. Do not feed during diapause, simply provide water and keep them in a cool, dark location.

Defense Mechanism

Dorymyrmex planidens lacks a functional sting. Instead, they use smear defense, secreting defensive chemical compounds from a slit-like opening at the tip of the abdomen. This is typical of the Dolichoderinae subfamily. While not dangerous to humans, these chemicals can be irritating and may leave a stain on surfaces. The ants are not aggressive toward keepers but will readily defend their nest if threatened.

Behavior and Colony Dynamics

These ants are characterized by their fast, alert movement and active foraging behavior. Workers search individually for food rather than using mass recruitment, though they will alert others when a good food source is found. They are not particularly aggressive but will readily defend their nest if threatened. The colony will grow gradually, expect the first year to focus on establishing the founding queen and producing nanitic (first) workers. Once established, colonies can grow to several hundred workers over 2-3 years. Queens are relatively long-lived for ants, and colonies can persist for several years with proper care. The small worker size means you should observe them closely for escape attempts, especially when the colony is small.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References