Cataulacus granulatus

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tropical and subtropical Asia: Nepal, India, China (Yunnan, Guangxi, Hainan), Thailand, Myanmar, Laos, Malaysia, Indonesia (Java, Sumatra), Borneo, Singapore, Philippines ^[1][5][6]. Found in forests and grasslands, but absent from human-modified areas ^[7][8]. Nests in living and dead twigs of trees, including bamboo stems ^[4][9], and has been found inside shoots of Saraca dives ^[10].
• Colony Type: Colony structure is not well documented. Based on typical *Cataulacus* patterns, they are likely single-queen (monogyne), but this is unconfirmed. Ergatoid replacement queens have not been recorded.
• Size & Growth:
  • Queen: 6.4–7.2 mm (total length) ^[1]
  • Worker: 4.2–5.6 mm (total length) ^[1]
  • Colony: Unknown – probably moderate, up to a few hundred workers, but no reliable data.
  • Growth: Moderate
  • Development: Estimated 6–8 weeks at 24–28°C (based on typical tropical Myrmicinae). (Direct data not available, this is an estimate. Warmer temperatures speed up development.)
• Antkeeping:
  • Temperature: Tropical – keep at 24–28°C. A gentle heat gradient helps workers self-regulate ^[3]. Avoid dropping below 22°C.
  • Humidity: Moderate. The nest substrate (e.g., twig cavities, Y‑tong chambers) should feel slightly moist, but not wet. Provide a water tube for drinking. Good ventilation is important.
  • Diapause: No diapause required. Maintain warmth year-round.
  • Nesting: Arboreal setup is essential. Use a naturalistic formicarium with small twigs, bamboo stems, or a Y‑tong (AAC) nest with narrow chambers. Avoid deep soil setups. Provide climbing structures for foraging.
• Behavior: Shy and non‑aggressive – they usually flee rather than fight. When threatened, they smear venom onto attackers using a modified stinger (Crematogastrini trait). Workers forage actively on vegetation, climbing branches and leaves. Escape risk is low to moderate for a 4–5 mm ant, standard barriers (fluon, oil) suffice. They may be slow to establish in a new setup.
• Common Issues: arboreal setup is critical – they will not survive in a soil formicarium., cold temperatures (below 22°C) can kill the colony quickly., wild colonies are hidden inside twigs – extracting them safely is tricky., limited published care data means some aspects require trial and error., foraging occurs on vegetation – ensure the outworld has branches or mesh to climb.

Housing and Nest Setup

This is the most important part of keeping Cataulacus granulatus. In the wild they nest in hollow twigs and bamboo stems ^[3][4][11], so you need to mimic that. A naturalistic setup with small dead twigs (stick them into a piece of foam or clay) works well. Alternatively, a Y‑tong (AAC) nest with narrow chambers scaled to their small size is fine – just make sure the nest offers vertical and horizontal climbing surfaces. Avoid acrylic nests (they don’t hold moisture properly). Never use a deep soil formicarium, these ants are completely arboreal. Attach a water tube for humidity and provide climbing structures (branches, mesh) in the outworld so they can forage as they would in the trees. Standard barriers (fluon or oil) will keep them contained.

Temperature and Heating

Being a tropical species from Southeast Asia and southern China, Cataulacus granulatus needs warmth year‑round. Keep the nest at 24–28°C ^[3]. Room temperature can work if your home doesn't drop below 22°C, but a small heating cable or mat on one side creates a useful gradient – place it on the side or top of the nest to avoid drying out the whole nest. If you see workers becoming sluggish, increase the temperature slightly. Do not let the nest fall below 22°C for extended periods.

Feeding and Diet

Foraging on vegetation, Cataulacus granulatus likely feeds on honeydew from aphids and scale insects, plus small arthropods they catch while hunting on leaves ^[3]. In captivity, offer a constant source of sugar water or honey (change every 2–3 days to avoid fermentation), and provide protein 2–3 times per week. Good protein options: freshly killed fruit flies, small crickets, or tiny roach nymphs. Remove uneaten prey after 24 hours to prevent mold. They are not big hunters, so keep prey very small.

Humidity and Water

These ants live in tree twigs, which maintain a moderately humid microclimate. In the nest, the substrate (Y‑tong or twig cavity) should feel slightly moist when you press it, but never waterlogged. Provide a gravity water tube or a small glass tube with a cotton plug for drinking – refill as needed. Good ventilation (small mesh openings) prevents condensation and mold. Do not let the nest dry out completely, but also avoid constant wetness, which can harm the brood. ^[3]

Colony Establishment

Getting a colony started is the hardest part. Wild colonies are hard to find because they live inside twigs and bamboo. If you obtain a queenright colony (e.g., from a seller), house them in a small tube or twig cavity with gentle heat. The founding process has not been directly observed in the literature, so details are unknown – be prepared to experiment. Once the first workers appear, growth seems to be moderate (estimated 6–8 weeks from egg to worker at 24–28°C). Be patient, established colonies are hardy if their arboreal needs are met. ^[1]

Behavior and Temperament

Cataulacus granulatus is a shy species. Workers rarely attack and prefer to flee or play dead when disturbed. Their heavy, sculptured exoskeleton makes them tough to crush, and as members of the Crematogastrini tribe, they can smear venom onto attackers using a modified flattened stinger – this is a defense, not an offense, and won't bother humans unless you handle them roughly. In the outworld, they spend most of their time climbing twigs and leaves, almost never walking on the ground. They are not territorial and can be kept in a shared enclosure only with great care (not recommended for beginners). ^[3][1]

Frequently Asked Questions

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References