Strumigenys canina

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to East Asia: Japan, South Korea, mainland China (including Hainan, Hong Kong, Macau, Taiwan), and northern Vietnam. Found in primary and secondary forests, rubber plantations, and tree-lined areas from 29m up to 1000m elevation ^[5][7][1].
• Colony Type: Polygynous, colonies contain multiple queens. One documented colony had 3 queens along with 149 workers,24 alate gynes, and 1 male ^[5].
• Size & Growth:
  • Queen: ~3-4mm, inferred from Strumigenys genus
  • Worker: ~2-3mm, inferred from Strumigenys genus
  • Colony: At least 150 workers documented, likely reaches several hundred in mature colonies ^[5]
  • Growth: Slow
  • Development: Estimated 8-12 weeks based on patterns for short-mandibulate Strumigenys (Development is slow, first workers (nanitics) are smaller than mature ones. Be patient with founding colonies.)
• Antkeeping:
  • Temperature: Keep warm, roughly 22-26°C (room temperature range). This species comes from warm subtropical to tropical areas, so stable warmth is important. A heating cable on one side can create a gradient. Avoid drafts and cold windows.
  • Humidity: High humidity is essential. Keep the nest substrate consistently moist but not waterlogged. These ants come from moist forest environments and nest in decaying wood ^[6][5]. Damp soil or plaster works well.
  • Diapause: Likely not required. Based on its subtropical distribution, maintain stable temperatures year-round. Colonies may show slightly reduced activity in cooler months but should remain active ^[7][5].
  • Nesting: Natural nest sites are moist, decaying wood ^[6]. In captivity, a naturalistic setup with damp soil or a Y-tong (AAC) nest with moisture chambers works well. Include some rotten wood pieces to mimic their natural environment.
• Behavior: Strumigenys canina is a specialized predator that uses its short mandibles to capture small prey, mainly springtails and other micro-arthropods. Workers are slow-moving and forage alone. They are not aggressive and avoid confrontation. They have a functional sting but it's too small to affect humans. Because of their tiny size, escape prevention is critical, use fine mesh (0.3mm or finer). This species is known for 'body smearing behavior' during hunting, documented by Masuko ^[8]. They are fascinating to watch but require patience.
• Common Issues: escape prevention is critical due to tiny 2-3mm size, they can slip through standard barriers, slow growth means colonies take months to establish, avoid overchecking or disturbing founding colonies, requires live prey (springtails), will not thrive on sugar alone or large prey items, high humidity is essential, dry conditions cause colony decline and death, wild-caught colonies may contain parasites that can devastate captive colonies

Housing and Nest Setup

Because Strumigenys canina nests in moist, decaying wood in the wild ^[6], your setup should provide high humidity and a natural feel. A Y-tong (AAC) nest with a built‑in moisture chamber works well. You can also use a naturalistic setup with flat stones placed on damp soil. The key is keeping the substrate consistently moist, think damp but not waterlogged. Adding a few pieces of rotten wood gives them hiding spots and mimics their natural environment. These ants are only 2-3mm, so all openings must be very narrow. Use fine mesh (0.3mm or smaller) on any vents or barriers. Connect the nest to an outworld with a soft tube or narrow bridge. A small water tube connected to the nest helps maintain humidity. Avoid plastic or acrylic nests because they don't hold moisture well.

Feeding and Diet

Strumigenys canina is a strict predator of tiny arthropods. In captivity, live springtails are the ideal prey, they are the right size for these ants' short mandibles. Other small live prey like booklice, dust mites, and flightless fruit flies may also be accepted. They rarely scavenge and will ignore dead prey or large insects. Sugar sources are not needed and will be ignored. Offer small amounts of live prey every few days. Remove any uneaten prey after 24 hours to prevent mold. If you can't keep a springtail culture going, this species will be very difficult to maintain. ^[5]

Temperature and Care

Keep your colony at a stable warm temperature, roughly 22-26°C (room temperature range). This species comes from warm subtropical and tropical areas of East Asia ^[7][5], so they don't tolerate cold. A heating cable on one side of the nest creates a temperature gradient, letting the ants choose their preferred spot. Avoid placing the colony near air conditioning vents or cold windows. Stable warmth is more important than hitting an exact number. They do not need hibernation, maintain the same temperature year-round ^[7][5].

Behavior and Temperament

Workers are slow, deliberate foragers that hunt alone. They are not aggressive and will flee from disturbance. They have a functional sting, but it is too small to cause any noticeable effect on humans. Their main defense is hiding. The most interesting behavior is 'body smearing', during hunting, they drag their bodies over prey, possibly to apply gland secretions that subdue it ^[8]. Because they are so tiny, always use very fine mesh (0.3mm or smaller) on any openings, they can squeeze through gaps that seem impossibly small. When disturbed, workers may play dead.

Colony Development

Colonies are polygynous, meaning they contain multiple queens. One documented colony had 3 queens together with 149 workers,24 alate gynes, and 1 male ^[5]. This suggests that several reproductive queens naturally coexist. Growth is slow, Strumigenys are not fast growers. A founding queen (if you manage to get one) will take several months to produce her first workers. The founding method is unknown, so be prepared to offer small live prey from the start if she is semi‑claustral. Be patient and avoid disturbing the colony often. Once established, the colony will grow gradually.

Seasonal Care and Nuptial Flights

In Hong Kong, alates (winged queens and males) have been collected from mid‑June to mid‑July, suggesting nuptial flights occur in early summer ^[5]. In Japan, workers are collected year‑round but more frequently in warmer months ^[6]. Because the species lives in subtropical regions, it does not need a true hibernation period. Keep temperatures stable year‑round. The colony may be slightly less active in winter but should remain active if kept warm. No special winter care is needed.

Frequently Asked Questions

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References