Stenamma snellingi

Stenamma snellingi

Stenamma snellingi is a small, dark brown ant native to western North America, ranging from British Columbia south to Baja California, Mexico ^[1][2]. Workers measure 2.8-3.4mm with a distinctive lighter gaster that has a dark transverse band near its middle ^[1]. This species is highly variable and closely related to Stenamma diecki, making identification challenging even with multiple specimens from the same colony ^[3]. The ants are typically found in the forest litter layer and nest in soil beneath rocks, tolerating a wide range of environmental conditions across their extensive range from near sea level to 9,000 feet elevation ^[1][3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Western North America (British Columbia to Baja California, east to Idaho, Colorado, New Mexico). Found in forest litter layer and under rocks in soil ^[1][4].
• Colony Type: Single-queen colonies (monogyne). All known colonies are founded beneath rocks in soil ^[1].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: 4.5 mm ^[1]
  • Worker: 2.8-3.4 mm ^[1]
  • Colony: Likely several hundred workers based on typical Stenamma colony sizes
  • Growth: Moderate, inferred from related species and extratropical distribution
  • Development: 6-10 weeks estimated based on related extratropical Stenamma species (Development time estimated, no specific study found for this species. Temperature-dependent, slower in cooler conditions.)
• Antkeeping:
  • Temperature: Keep around 18-22°C. Wide altitude range (700-9000 ft) suggests tolerance to cooler conditions. Avoid overheating.
  • Humidity: Moderate to high, forest floor species that prefers damp soil. Keep substrate consistently moist but not waterlogged.
  • Diapause: Yes, recommended for 2-3 months at 5-10°C during winter, consistent with temperate origin ^[1]
  • Nesting: Y-tong or plaster nests work well. They naturally nest under rocks in soil, so provide a naturalistic setup with some soil substrate or a nest chamber with good moisture retention. Acceptable: test tube setups for founding colonies.
• Behavior: Generally peaceful, non-aggressive ants. Workers are small (under 3.5mm) and not particularly defensive. They forage in the litter layer and are not known to sting aggressively, Myrmicinae have stingers but this genus is not aggressive. Escape risk is moderate due to small size, use standard barriers. Activity level is moderate, they are not particularly active foragers compared to some genera.
• Common Issues: colonies grow slowly, beginners may lose patience and overfeed, causing mold, small size makes escape prevention important, use tight-fitting lids and fine mesh, humidity management is critical, too dry and brood dies, too wet and mold becomes a problem, founding colonies are fragile, queen needs quiet, dark location for first workers, winter dieback is possible if diapause conditions are not provided

Housing and Nest Setup

Stenamma snellingi does well in Y-tong (AAC) nests or plaster nests that retain moisture well. In the wild, they nest in soil beneath rocks, so a naturalistic setup with a thin layer of soil substrate works perfectly ^[1]. For founding colonies, a standard test tube setup with a water reservoir works well, the queen will seal herself into a chamber and raise her first workers there. Once the colony reaches 20-30 workers, you can consider moving them to a larger formicarium. Because they are small ants, avoid nests with overly large chambers where they may feel exposed. A small to medium Y-tong nest with tight chambers scaled to their size is ideal. Always use excellent escape prevention, these ants are small enough to squeeze through standard gaps if not careful.

Feeding and Diet

Stenamma snellingi is a generalist forager that collects food from the forest floor. In captivity, offer protein sources like small mealworms, fruit flies, or other tiny insects twice weekly. They also accept sugar water or honey occasionally. Since they are small ants, prey items should be appropriately sized, too large and they cannot tackle them. Remove uneaten prey after 24-48 hours to prevent mold. A constant supply of sugar water is recommended once workers are established. Feed less frequently during diapause (once weekly or less) when the colony is dormant. ^[3]

Temperature and Seasonal Care

Keep your colony at room temperature (18-22°C) year-round, with a slight warming option during active growth periods. This species tolerates a wide altitude range in the wild (700 to 9,000 feet) ^[1], indicating good temperature flexibility. During winter, provide a diapause period of 2-3 months at 5-10°C, this mimics their natural seasonal cycle and promotes healthy colony development. You can move them to an unheated garage or refrigerator during this time. Reduce feeding during diapause and keep the nest slightly drier but not bone-dry. Resume normal feeding and temperatures gradually in spring.

Growth and Development

The colony starts with a claustral queen sealing herself into a chamber, living off her stored fat reserves while raising the first brood. Workers (nanitics) will be smaller than normal workers and typically appear within 6-10 weeks under optimal conditions. After that, growth is moderate, expect several months to reach 50 workers, and potentially a year or more to reach several hundred. Males and female alates are produced in late summer in the wild ^[1], so you may see winged reproductives develop in established colonies during late summer or fall. The colony does not reach large sizes quickly, so patience is required.

Behavior and Temperament

These are peaceful, non-aggressive ants that are well-suited for antkeepers who want a calm species. Workers are small and forage primarily in the litter layer, not aggressively defending their nest. They do not have a functional stinger that poses any significant threat to humans. The main concern for keepers is their small size making escape prevention important, use fluon on edges and fine mesh on any ventilation. They are not known for being particularly active or exciting to watch compared to some ants, but their subtle foraging behavior is interesting for those who appreciate quieter species. Colonies are typically single-queen (monogyne) in structure. ^[1][3]

Frequently Asked Questions

References