Temnothorax josephi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southwestern New Mexico, USA. Found in dead branches of living oak trees (*Quercus arizonica*) in pine forests with oaks, pinyon pines, and junipers, often near streams. Nests are located 1.5–3 m above ground in dry dead branches ^[1].
• Colony Type: Single-queen colonies (monogyne). Each nest contains one dealate queen and 41–76 workers ^[1].
• Size & Growth:
  • Queen: ~5 mm total length ^[1]
  • Worker: ~3 mm total length ^[1]
  • Colony: Up to 76 workers ^[1]
  • Growth: Moderate (typical for small Temnothorax)
  • Development: Estimated 6–10 weeks, based on typical Temnothorax development at optimal temperature (Specific data for this species is unavailable, the estimate is inferred from related species.)
• Antkeeping:
  • Temperature: Keep cool, around 18–22 °C. Their high‑elevation origin (2185 m) suggests they prefer cooler conditions – avoid overheating ^[1].
  • Humidity: Moderate humidity. In nature they nest in dry dead branches, so they tolerate drier conditions than many ants, but the nest should not be bone‑dry. Aim for lightly moist substrate ^[1].
  • Diapause: Yes – based on their high‑elevation habitat, they likely need a winter dormancy. Provide 3–4 months at 5–10 °C ^[1].
  • Nesting: Y‑tong (AAC) or plaster nests with small, tight chambers work well. They naturally nest in small cavities inside dead wood, so scaled‑down spaces are best.
• Behavior: Timid and non‑aggressive. Workers hide when disturbed instead of defending. They have a modified stinger used to smear venom (characteristic of the tribe Crematogastrini), but rarely use it defensively. Foraging activity is moderate. Their small size (3 mm) means standard escape barriers are enough ^[1].
• Common Issues: colonies grow slowly and stay small – beginners expecting rapid growth may be frustrated., high‑elevation origin makes them sensitive to overheating, keep away from heat sources., dry‑branch nesting means they prefer drier conditions – avoid over‑humidifying the nest., rarely collected, so wild‑caught colonies can be hard to find., founding queens are delicate – leave them completely undisturbed during the initial weeks.

Housing and Nest Setup

Temnothorax josephi does well in Y‑tong (AAC) or plaster nests with small, interconnected chambers that mimic the tight spaces inside dead tree branches. In the wild they nest in cavities inside dry dead branches of oak trees ^[1]. Avoid large open spaces – these ants prefer a cozy, cluttered layout. A test tube setup works during founding, but once the colony reaches 20–30 workers, move them to a proper nest. Standard escape barriers are adequate for their 3 mm size.

Feeding and Diet

Like most Temnothorax, T. josephi is a generalist feeder. Offer small protein sources such as fruit flies, pinhead crickets, or tiny mealworms once or twice a week, and keep sugar water or honey water available at all times. Remove uneaten prey after 24 hours to prevent mold. Because colonies stay small (up to 76 workers), portion sizes should be tiny – a few fruit flies or a single drop of sugar water is enough.

Temperature and Seasonal Care

These ants come from high elevation (2185 m) in New Mexico, so they prefer cooler conditions than many kept ants. Keep the nest area at 18–22 °C and avoid heat sources or direct sunlight – overheating can quickly kill the colony ^[1]. In winter, provide a dormancy period of 3–4 months at 5–10 °C to match their natural seasonal cycle. Store the colony in a cool, stable place (garage, basement, or refrigerator) during this time. Do not feed during diapause.

Colony Founding

The founding method for Temnothorax josephi has not been directly studied (no published data confirms claustral or semi‑claustral behavior). Based on its cavity‑nesting habits, you can try a standard test tube setup with a small entrance hole to mimic a natural cavity. Place the queen in a dark, undisturbed spot at 18–22 °C. Keep her completely alone until the first workers appear – disturbance can cause her to eat brood or abandon the nest. Development time from egg to worker is estimated at 6–10 weeks, but this may vary. ^[1]

Behavior and Temperament

Temnothorax josephi is a timid species. Workers prefer to hide or freeze when disturbed rather than attack or sting. They belong to the tribe Crematogastrini, whose members have a modified, spatulate stinger used to smear venom onto enemies rather than pierce – but they rarely use it defensively in captivity. Foraging is moderate and colonies stay small, so you won’t see large swarms. Their peaceful nature makes them great for observation, but they are easily stressed by frequent disturbance ^[1].

Frequently Asked Questions

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References