Temnothorax obliquicanthus

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southwestern United States (Colorado, New Mexico, Nevada, Texas) and northern Mexico (Baja California, Sonora). Found in dry grassy areas to semi-moist meadows, sagebrush, and high dry short-grass plains ^[1]. In the Mojave National Preserve, they inhabit Joshua Tree and Pinyon/Juniper Woodland between 4400–5700 ft elevation ^[5].
• Colony Type: Monogyne – each colony has a single queen ^[1]. Colonies are small, typical of the genus.
• Size & Growth:
  • Queen: Unknown – no data available. Based on genus patterns, likely ~4–5mm (inferred).
  • Worker: 2.6mm ^[1]
  • Colony: Under 100 workers (inferred from typical Temnothorax colonies)
  • Growth: Moderate
  • Development: 6–10 weeks (estimated from genus patterns – exact timing unconfirmed) (Inferred from Temnothorax genus, actual development for this species is unknown.)
• Antkeeping:
  • Temperature: Cool to moderate – aim for 18–22°C. They are a cold-climate specialist from high-elevation Mojave habitats (4400–5700 ft) and prefer cooler conditions ^[5]. Room temperature is usually suitable. Avoid anything above 25°C.
  • Humidity: Low to moderate. They come from dry to semi-moist grassy areas. Keep the nest substrate lightly moist but allow parts to dry out. Overly damp conditions are risky.
  • Diapause: Yes – likely required. Activity from March–September suggests a winter rest period ^[5]. Provide 2–3 months at 10–15°C.
  • Nesting: Y‑tong (AAC) or plaster nests with small chambers work well. In nature they nest in exposed soil, often in pre‑existing cavities ^[5][1]. They do not dig their own tunnels, so provide formed chambers.
• Behavior: Peaceful and non‑aggressive. Workers are diurnal foragers, active during the day thanks to their large eyes. Their defense mechanism is a modified stinger that smears venom rather than piercing, so they are harmless to humans. Escape risk is moderate: they are tiny (2.6mm) but not fast runners. Use standard escape prevention (Fluon on test tube rims, fine mesh on outworlds).
• Common Issues: colonies are rarely collected and may suffer stress from wild capture, slow population growth – patience required for such a small colony species, cold‑climate specialist means they may struggle in warm rooms above 25°C, overwatering is more dangerous than under‑watering due to dry habitat preference, tiny size makes them easy to lose – secure all openings

Housing and Nest Setup

Temnothorax obliquicanthus is tiny and needs appropriately sized housing. A test tube setup works for founding – use a small tube with a cotton ball separating the water reservoir from the ants. The tube should be small enough that the queen can easily reach the water. For established colonies, a Y‑tong (AAC) nest with small chambers is ideal. These ants do not excavate, they use pre‑existing cavities, so give them chambers that are already formed ^[1]. Keep the nest substrate lightly moist but not wet. Connect a small outworld for foraging. Because they come from dry to semi‑moist habitats, avoid over‑humid conditions.

Feeding and Diet

In the wild, T. obliquicanthus is a generalist forager that scavenges and preys on soil microarthropods ^[5]. In captivity, offer a varied diet. Protein sources should include small live prey like fruit flies, pinhead crickets, or mealworm pieces. They will also accept dead insects. Sugar is important – offer diluted honey, sugar water, or ant jelly regularly. Because they are tiny, food items must be appropriately sized. Feed small amounts every 2–3 days and remove uneaten food to prevent mold. Keep a constant sugar source available.

Temperature and Seasonal Care

This species is a cold‑climate specialist from high‑elevation Mojave habitats (4400–5700 ft) ^[5]. Aim for 18–22°C. They are active from March to September in the wild, which suggests they tolerate and may require cool conditions ^[5]. Overheating (above 25°C) is likely stressful. For winter, provide a diapause period of 2–3 months at 10–15°C. You can use a refrigerator (not freezer) or a cool basement. During diapause, reduce feeding but ensure water is always available. Do not feed during the deep cold period.

Colony Development

Temnothorax colonies grow slowly compared to many common ants. A founding colony will take several months to produce its first workers (nanitics), and many more months to reach even 20–30 workers. The queen is likely claustral (based on genus patterns), but this is unconfirmed for this species. If she is claustral, she will seal herself in a small chamber and raise the first brood on stored reserves. Do not disturb a founding colony for the first 4–6 weeks. Once workers appear, they are tiny (~2.6mm) and the colony can start foraging. Patience is essential – it may take 1–2 years to reach 50+ workers. ^[1]

Behavior and Observation

Workers are diurnal – active during the day. Their large eyes are an adaptation for scanning for predators before exiting the nest ^[1]. They move deliberately rather than frantically, which makes them interesting to watch. They are not aggressive and use a smearing venom defense that is harmless to humans. When threatened, they may flee or play dead. Colonies are small and peaceful, you can keep multiple colonies in close proximity without issues. Their dark color and huge eyes make them visually distinctive among small ants.

Frequently Asked Questions

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References