Patagonomyrmex angustus

Polygynous (multiple queens), as typical for the angustus-group in the genus Patagonomyrmex

Usually under 400 workers, rarely exceeding that size in natural nests

Slow to medium growth—colonies expand gradually, especially in cooler climates

• Queens: ~7–9 mm

• Workers: ~4–6 mm

• Primarily granivorous: seeds from grasses, shrubs (dry seeds only)

• Occasionally collect small insects or arthropod matter depending on availability

• Sugar water or honey should be offered sparingly and dilute

These ants are adapted to low-moisture environments—avoid overly wet foods and prevent humidity build-up that could spoil seeds.

• Humidity:

  • Arena: 30–50%

  • Nest: 40–60%

• Temperature:

  • Arena: 20–25 °C 

  • Nest: 20–24 °C

• Foragers are diurnal, slow-moving, and solitary, showing timid and non-aggressive behavior

• Nests are modest in size (often under a stone or in open ground), without elaborate structures or visible mounds

• Use naturalistic formicaria with fine dry substrate (sand-clay mix or plaster)

• Moderate ventilation is key to prevent mold—cool, slightly humid nest conditions are optimal

• Avoid overly tight or high-moisture setups

Patagonomyrmex angustus is a rare seed-harvester ant best suited to hobbyists who appreciate structured, calm, and low-aggression colonies. Their small size, polygynous nesting, and temperate adaptations require patient care with dry seed-based diets, cool temperatures, and steady humidity control. With proper conditions and light feeding, these ants are fascinating and rewarding to observe.