Dorymyrmex pulchellus

Dorymyrmex pulchellus

Dorymyrmex pulchellus is a small ant species native to Argentina, belonging to the Dolichoderinae subfamily. Workers are modest in size and possess the characteristic conical abdomen that gives the genus its common name. This species was described by Santschi in 1922 and is found primarily in the Santa Fe province and Formosa region of northern Argentina. As a member of the Opportunist/Dominant Dolichoderinae functional group, these ants are adaptable and can establish colonies in various nesting situations. Like other Dolichoderinae, they lack a stinger but can defend themselves by spraying formic acid. The species remains poorly studied in captivity, with limited documented information on its specific care requirements.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to northern Argentina, specifically recorded in Santa Fe province and Formosa (Nueva Pompeya). Found in the Neotropical region, likely in warm, semi-open to open habitats typical of Dorymyrmex species ^[1][2][3].
• Colony Type: Likely single-queen (monogyne) colonies based on typical Dorymyrmex patterns. Colony size is estimated to be moderate, likely reaching a few thousand workers at maturity.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 5-7mm based on genus Dorymyrmex patterns
  • Worker: Estimated 2.5-4mm based on genus Dorymyrmex patterns
  • Colony: Estimated a few thousand workers based on typical Dorymyrmex colony sizes
  • Growth: Moderate, inferred from genus patterns
  • Development: Estimated 6-8 weeks at optimal temperature based on related Dolichoderinae (Development time is inferred from genus patterns, actual timing unconfirmed for this species)
• Antkeeping:
  • Temperature: Keep at 24-28°C. These are warm-climate ants from subtropical Argentina, so they need temperatures in the low-to-mid 20s°C minimum. A heating cable on one side of the nest creates a gradient allowing workers to self-regulate
  • Humidity: Moderate humidity around 50-60%. Provide a water tube and allow the nest to dry partially between rehydrations. Dorymyrmex species typically nest in soil and can tolerate some dryness
  • Diapause: Likely a short winter slowdown period (2-3 months at 15-18°C) given the subtropical Argentine range, though this is unconfirmed for this specific species
  • Nesting: Y-tong (AAC) nests or test tube setups work well. These ants are not particularly large, so standard chambers are appropriate. Provide a connection to an outworld with substrate for natural tunneling behavior
• Behavior: Active foragers with typical Dolichoderinae behavior. Workers are alert and will readily explore their outworld. They lack a stinger but can spray formic acid as defense, this is rarely an issue for keepers. Escape risk is moderate due to their small size, use standard barriers. They are not aggressive but will defend the nest if threatened. Workers are fast-moving and good at finding food sources.
• Common Issues: limited species-specific information makes care recommendations uncertain, small colony size at founding means founding colonies are fragile, warm temperature requirements may need heating in cooler climates, escape prevention needed due to small worker size, winter care is unconfirmed, proceed with caution

Housing and Nest Setup

Dorymyrmex pulchellus can be kept in standard test tube setups for founding colonies. Once the colony reaches 15-20 workers, consider moving to a Y-tong (AAC) formicarium or a naturalistic setup with a dirt chamber. These ants are not large, so overly large nests can make them feel insecure. Provide a water tube connected to the nest for humidity. The outworld should have a small container of moist substrate (like sand or soil mix) to allow natural foraging and tunneling behavior. Standard escape prevention measures work well, these ants are small but not particularly adept at climbing smooth surfaces like glass or acrylic.

Feeding and Diet

Like other Dorymyrmex species, these ants are opportunistic feeders that accept both sugar and protein sources. Offer sugar water (1:1 ratio) or honey water as a constant energy source. For protein, provide small insects like fruit flies, small mealworms, or cricket pieces. They will also scavenge from dead insects. Feed protein 2-3 times per week, removing any uneaten prey after 24 hours. Fresh water should always be available. The specific dietary preferences of D. pulchellus are unconfirmed, so observe what your colony accepts best.

Temperature and Heating

As ants from subtropical Argentina, Dorymyrmex pulchellus requires warm conditions. Keep the nest area at 24-28°C for optimal colony development. Room temperature may be sufficient in warm climates, but most keepers will need a heating cable or heat mat placed on one side of the nest to maintain these temperatures. Use a digital thermometer to monitor. Avoid temperatures above 32°C as this can stress the colony. Provide a temperature gradient so workers can move between warmer and cooler areas as needed.

Seasonal Care and Winter Rest

The exact overwintering requirements for this species are unconfirmed due to limited research. However, based on the subtropical Argentine range (Santa Fe, Formosa), a short winter rest period is likely beneficial. During winter (roughly November-February in the Northern Hemisphere), reduce temperatures to 15-18°C for 2-3 months. Reduce feeding frequency during this period. Do not feed during the deepest part of the rest. Return to normal temperatures gradually in spring. If your colony shows no signs of slowing down, they may not need a formal hibernation, observe your colony behavior.

Colony Development

A newly mated queen will seal herself in a small chamber and lay eggs. She feeds on her stored fat reserves to raise the first brood (claustral founding). The first workers, called nanitics, are typically smaller than mature workers. Expect 4-8 weeks for eggs to develop into workers at optimal temperature. Growth rate is moderate, colonies may take 1-2 years to reach 100+ workers. Maximum colony size is estimated at a few thousand workers based on typical Dorymyrmex patterns. Patience is key, as this species is not a fast grower.

Frequently Asked Questions

References