Nylanderia terricola

Nylanderia terricola

Nylanderia terricola is a small ant native across most of the United States and northern-central Mexico, making it one of the most widespread Nylanderia species in North America ^[1]. Workers measure 1.96-2.63 mm and have a distinctive bicolored appearance, yellowish-brown to dark brown with the head and gaster slightly darker than the mesosoma. Their cuticle is smooth and shiny with sparse pubescence on the head. These ants are virtually impossible to distinguish from the closely related N. vividula based on worker morphology alone, males are required for reliable identification ^[1].

These ants are characteristic of prairie habitats but have adapted to thrive in varied environments from open disturbed areas to mesquite shrubland and woodlands ^[2]. They nest under stones, logs, or cow dung, and can also establish colonies in open grassy areas. Their remarkable thermal tolerance, with a critical thermal maximum of 46.7°C, allows them to persist even in hot, dry conditions ^[3]. This resilience has helped them survive alongside invasive fire ants in Texas ^[4].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the Nearctic region, found across practically the entire United States and much of northern and central Mexico ^[1]. Characteristic of prairies but also found in open disturbed areas, mesquite shrubland, pinyon woodland, sagebrush, post-oak woodlands, and areas adjacent to forests. Nests under stones, logs, or cow dung, or directly in soil. Found in most soil types except very sandy soils ^[2][1].
• Colony Type: Colony structure is not well-documented in scientific literature. Based on typical Nylanderia patterns, likely single-queen colonies, though this requires confirmation.
  • Founding: Claustral
• Size & Growth:
  • Queen: 3.83-4.58 mm ^[1]
  • Worker: 1.96-2.63 mm ^[1]
  • Colony: Approximately 300 workers per colony ^[3]
  • Growth: Moderate, estimated based on typical Formicinae development
  • Development: 6-10 weeks estimated based on related Formicinae species (Development time inferred from genus patterns, direct measurements not available for this species)
• Antkeeping:
  • Temperature: Keep between 20-26°C. These ants are active foragers but avoid temperatures above 30°C, in the wild they forage primarily at night or early morning ^[3]. A room-temperature setup with a slight gradient works well.
  • Humidity: Moderate humidity around 50-70%. They nest in soil and under stones in nature, so keep the nest substrate moist but not waterlogged. Their small size makes them more susceptible to desiccation ^[5].
  • Diapause: Yes, alates (reproductives) overwinter in the nest and fly in spring and early summer ^[1]. Provide a cool period around 10-15°C during winter months.
  • Nesting: Use test tubes or small formicarium setups. They prefer soil-based nests and will nest under stones or in soil in captivity. A small Y-tong or plaster nest works well. Keep the nest humid and provide a moisture gradient so ants can choose their preferred zone.
• Behavior: These ants are relatively docile and non-aggressive. Workers are small but active foragers, primarily hunting for sugar sources and honeydew. They show a strong preference for sweet liquids, in studies,84% of individuals were collected from grape agar baits ^[6]. They forage mainly at night or during cool early morning hours to avoid heat stress ^[3]. Their small size (under 3mm) means they can escape through tiny gaps, excellent escape prevention is essential. They are more susceptible to desiccation than larger ant species ^[5].
• Common Issues: escape prevention is critical due to their tiny size, they can squeeze through standard test tube cotton if gaps exist, colonies are sensitive to heat and dry conditions, avoid temperatures above 30°C and keep nest substrate adequately moist, slow founding phase, claustral queens may take several weeks to seal in and raise first workers, small colony size means slower population growth compared to larger ant species, difficulty distinguishing from N. vividula, if you catch a wild queen, identification may require male offspring

Nest Preferences

In the wild, Nylanderia terricola nests under stones, logs, or cow dung, or directly in soil in open grassy areas ^[1][2]. They prefer soil types that retain some moisture but avoid very sandy soils. This tells us they need humid, soil-based housing in captivity.

For antkeepers, a small test tube setup works well for founding colonies. Use a test tube with a water reservoir at one end, stopped with cotton, the ants will naturally move to the humid end. As the colony grows, you can transition to a small plaster or Y-tong formicarium with a soil chamber. Keep the nest material consistently moist but not waterlogged, squeeze out excess water so the substrate feels damp but no water pools. Provide a moisture gradient by keeping one end slightly drier so ants can self-regulate. A small piece of bark or stone on top of the nest chamber mimics their natural cover and helps them feel secure.

Feeding and Diet

These ants are opportunistic foragers with a strong preference for sugar sources. In the wild, they tend honeydew-excreting Homoptera (aphids and similar insects) and collect nectar ^[6]. They also scavenge for proteins from dead insects.

For captive care, offer a constant supply of sugar water, honey, or diluted maple syrup. Change sugar water every 2-3 days to prevent mold. For protein, offer small insects like fruit flies, small mealworms, or cricket legs. In studies, they strongly preferred grape agar baits over protein baits like tuna ^[6], so sweet foods should be the foundation of their diet. Feed protein 1-2 times per week, adjusting based on colony size and consumption. Remove uneaten prey after 24 hours to prevent mold. A small foraging arena makes it easy to observe feeding behavior and remove leftovers.

Temperature and Care

Nylanderia terricola has an impressive thermal tolerance with a critical thermal maximum of 46.7°C ^[3], but they actively avoid temperatures above 30°C in the wild. This means they're comfortable at typical room temperature (20-26°C) but should be kept away from direct heat sources.

Keep the nest at room temperature, ideally 22-25°C. A heating cable is not necessary unless your room stays below 20°C. If you do use heat, place it on one side of the nest to create a temperature gradient, the ants will move to their preferred zone. Avoid any temperatures over 30°C.

For winter care, provide a diapause period since alates overwinter in the nest naturally ^[1]. Reduce temperature to 10-15°C for 2-3 months during winter. You can do this by moving the colony to a cooler location like an unheated garage or basement. Reduce feeding during this period but ensure a small water source is available.

Behavior and Temperament

These are small, active ants with a generally docile temperament. Workers are not aggressive and don't have a painful sting, they're harmless to humans. However, their small size (under 3mm workers) makes them excellent escape artists.

Escape prevention is critical. Use tight-fitting lids on test tubes and formicaria. If using cotton as a barrier, ensure it's packed tightly, these ants can push through loose cotton. Standard mesh barriers may need to be double-layered. Check connections between nest sections regularly.

Foraging activity peaks at night and during cool early morning hours ^[3]. You may notice your ants becoming more active in the evening or early morning. They form foraging trails and can recruit nestmates to food sources. Their susceptibility to desiccation means they prefer humid nest conditions, keep the substrate consistently moist and avoid dry outworld conditions.

Frequently Asked Questions

References