Uwari keihitoi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Japan (Honshu, Shikoku, Kyushu and surrounding islands), the Korean Peninsula, and southern China. This species lives in forests and forest edges, nesting arboreally in dead twigs on standing trees, decayed wood, and rotting wood ^[2][3].
• Colony Type: Colony structure is unconfirmed. Based on typical Camponotus patterns, it is likely monogyne (single queen per colony), but this has not been verified from published research.
• Size & Growth:
  • Queen: 6.8-8.0 mm ^[2]
  • Worker: 4.5-7.1 mm (minor workers 4.5-5.97 mm, major workers 5.95-7.10 mm) ^[1][4]
  • Colony: Several hundred workers (estimated from Camponotus genus patterns)
  • Growth: Moderate, typical for carpenter ants
  • Development: 6-10 weeks at optimal temperature (estimated based on genus patterns) (Development time is estimated from typical Camponotus patterns. Queens are believed to found claustrally, but this has not been confirmed for this species.)
• Antkeeping:
  • Temperature: Keep at room temperature (20-24°C). Avoid major fluctuations. A gentle gradient using a heating cable on one side of the nest can help, but stable conditions are fine ^[2].
  • Humidity: Moderate humidity, keep the nest substrate dry to slightly moist. As an arboreal species, they prefer drier conditions than ground-nesting ants. Provide a water tube for drinking, but do not saturate the nest ^[2].
  • Diapause: Yes, this temperate species requires a winter rest period. Reduce temperature to 10-15°C for 3-4 months during winter (e.g., November to February). Skipping hibernation can weaken the colony ^[2].
  • Nesting: Use an arboreal setup, provide dead twigs, cork bark, or a Y-tong / plaster nest with narrow chambers. They do not need soil or deep substrate in the nest area. An outworld with branches or twigs allows natural foraging behavior ^[2].
• Behavior: Generally calm and non-aggressive. Workers forage actively for honeydew and small insects. As a Formicine, they spray formic acid when threatened, they do not have a functional stinger. They have metapleural glands, which produce antibiotic secretions ^[2]. Escape risk is moderate due to their medium size, use standard barriers.
• Common Issues: arboreal nesting needs, standard test tube setups may not be ideal for established colonies, provide vertical space with twigs or bark., winter diapause is essential, skipping hibernation can weaken or kill the colony., wild-caught colonies may carry parasites or be stressed from arboreal collection., metapleural gland secretions help control pathogens, but mold can still develop if humidity is too high.

Housing and Nest Setup

Uwari keihitoi is an arboreal species that naturally nests in dead twigs and decaying wood on standing trees. In captivity, provide a setup that allows vertical movement and climbing space. A Y-tong (AAC) or plaster nest with narrow chambers works well, and you should also give them an outworld with branches, cork bark, or twigs for natural foraging. Avoid deep soil substrates, they do not need them. Keep the nest area relatively dry, use a water tube for humidity but do not soak the nest material. Escape prevention is standard for medium-sized ants ^[2][3].

Feeding and Diet

Like most carpenter ants, Uwari keihitoi is omnivorous. They readily take sugar water or honey as an energy source, and protein from small insects such as fruit flies, small mealworms, or cricket pieces. In the wild, they forage for honeydew from aphids and scale insects, plus small arthropods. Feed protein twice a week and keep a constant supply of sugar water. Remove uneaten prey after 24-48 hours to prevent mold. They are not specialized predators, so standard ant feeding routines work ^[1][2].

Temperature and Seasonal Care

Keep your colony at 20-24°C for optimal brood development. This species comes from temperate regions of Japan and Korea, so they experience distinct seasons. During summer, room temperature is usually fine. In winter, you must provide a diapause period, reduce temperatures to 10-15°C for 3-4 months (e.g., November through February). This mimics their natural cycle and is essential for colony health. Move the colony to a cooler location like a garage or basement, or use a thermoelectric cooler. Do not skip hibernation, it can weaken the colony and affect reproduction ^[2].

Colony Founding

Founding behavior for Uwari keihitoi has not been documented in published research. Based on typical Camponotus patterns, queens likely found claustrally, sealing themselves in a chamber and raising the first brood on stored reserves without foraging. However, this is unconfirmed. If you have a newly mated queen, place her in a test tube setup with a water reservoir, keep her in complete darkness, and avoid disturbing her. Expect first workers (nanitics) to appear after 6-10 weeks if founding is successful. Once workers emerge, you can begin feeding ^[2].

Behavior and Defense

This species is relatively calm compared to some carpenter ants. Workers forage actively and explore their outworld for food. One unique feature is their metapleural glands, which produce antibiotic secretions that help control pathogens in the nest. When threatened, they spray formic acid, they do not have a functional stinger. They are not aggressive, but always handle with care. Their arboreal nature means they prefer to travel along branches and vertical surfaces. Workers are medium-sized, so escape risk is moderate ^[2][3].

Frequently Asked Questions

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References