Temnothorax tricarinatus

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Western United States: North Dakota, South Dakota, Idaho, Wyoming, Utah, Nevada, Arizona, Colorado, New Mexico, Nebraska, and Iowa. They live in open grasslands, foothill meadows, sagebrush, and forest clearings. Nests are under rocks in moist soil ^[1].
• Colony Type: Facultatively polygynous, colonies can have a single queen (monogyne) or multiple queens (polygyny) ^[1].
• Size & Growth:
  • Queen: Variable in size ^[1]
  • Worker: 2-2.6 mm ^[1]
  • Colony: Up to 100 workers ^[1]
  • Growth: Moderate
  • Development: 6-10 weeks (inferred from related Temnothorax species, not directly studied for this species) (Keep temperatures around 22-24°C for consistent development. Exact timing is unknown without direct studies.)
• Antkeeping:
  • Temperature: Based on their temperate range, keep at room temperature, roughly 20-24°C. Provide a temperature gradient so workers can choose. Avoid prolonged heat above 28°C.
  • Humidity: Moderate to high humidity. Keep the nest substrate consistently moist but not waterlogged. These ants naturally nest in moist soil under rocks ^[1].
  • Diapause: Yes, this species is from temperate regions with cold winters. Give them a winter rest period of 2-3 months at 5-10°C. This is inferred from their natural range and is likely necessary for long-term health.
  • Nesting: Y-tong (AAC) nests work well because the chambers are small and match the ants' size. Naturalistic setups with flat stones over moist soil also work nicely and mimic their natural habitat ^[1]. Avoid dry, airy nests.
• Behavior: Generally peaceful and harmless. Workers are active at dawn and dusk (crepuscular) ^[2]. They have a modified stinger used for smearing venom, but it cannot pierce human skin. Escape prevention is critical because of their tiny size, use fine mesh (0.5 mm or finer) and tight lids. They are not aggressive toward keepers.
• Common Issues: small size means escapes are likely without fine mesh barriers, colonies stay small (under 100 workers) so don't expect massive colonies, moisture needs are moderate, too dry causes colony decline, winter diapause is likely required for long-term health, wild-caught colonies may have parasites, quarantine new colonies

Housing and Nest Setup

Temnothorax tricarinatus is tiny, so their nest needs to match their size. Y-tong (AAC) nests are excellent because the chambers are narrow and let the ants feel secure. You can also use naturalistic setups: place a flat stone over moist soil or plaster so they can dig their own chambers, just like in nature ^[1].

For the outworld, a small container or test tube works during founding. Once the colony grows a bit, connect a modest outworld area. Because the ants are so small, you must take escape prevention seriously. Use fine mesh (0.5 mm or smaller) on all vents, and make sure lids seal tightly. They aren't strong climbers on smooth surfaces, but they can squeeze through gaps you might not notice.

Feeding and Diet

In the wild, these ants hunt small arthropods and also collect honeydew from aphids and scale insects ^[1]. In captivity, offer small live prey like fruit flies, springtails, or pinhead crickets. You can also give them sugar water or diluted honey for energy, but protein-rich foods should be the main part of their diet.

Feed small amounts every 2-3 days. Watch how fast the colony eats and adjust. Since colonies stay under 100 workers, a few fruit flies per feeding is plenty. Remove any leftover prey after 24 hours to avoid mold. A constant supply of sugar water is optional but can help during growth phases.

Temperature and Seasonal Care

Keep your colony at room temperature, about 20-24°C. They can handle a range from roughly 18-26°C. It's more important to be consistent than to hit an exact number. A gentle temperature gradient (using a small heating cable on one side) allows workers to choose their comfort zone.

Like most temperate ants, this species likely needs a winter rest period. Starting in late fall, gradually cool them down to 5-10°C and keep them there for 2-3 months. During this diapause, offer very little food and keep the nest slightly moist but not wet. This rest is important for the colony's long-term health and next year's growth. In spring, slowly warm them back up to normal temperatures.

Colony Structure and Queen Care

This species is facultatively polygynous, you might find colonies with one queen or several ^[1]. If you start from a founding queen, she will seal herself in a small chamber (claustral founding is typical for Temnothorax, but unconfirmed for this species) and raise her first workers alone on stored reserves. The first workers (nanitics) are often smaller than later generations.

Multiple queens can peacefully share an established colony. If you have a polygynous colony, avoid separating the queens unless you're experienced. Colony growth is moderate, and mature colonies stay under 100 workers. Don't expect a massive colony, they stay small their whole lives.

Behavior and Observation

Temnothorax tricarinatus forages mainly at dawn and dusk ^[2]. Their eyes are relatively large, which helps them see in low light. Workers are active and quick, searching for small prey and tending honeydew sources.

The species is peaceful and not aggressive toward keepers. They have a modified stinger used for smearing venom onto enemies (a common defense in the Crematogastrini tribe), but it cannot pierce human skin. Their tiny size means they can escape easily, so always use fine mesh and tight lids. Watching their twilight foraging is one of the best parts of keeping this species.

Frequently Asked Questions

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References