Syscia yekzoeae

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Sabah, Malaysia (Borneo), found under rotting wood and in soil in tropical forest habitat ^[1]
• Colony Type: Unconfirmed. The type series included two queens, but the social structure has not been determined. Workers can lay unfertilized eggs that develop into males ^[1].
• Size & Growth:
  • Queen: Similar to worker in body length (estimated 3.6-4.1 mm) ^[1]
  • Worker: 3.6-4.1 mm total length ^[1]
  • Colony: Unknown, only known from a partial colony of 6 workers and 2 queens, likely small ^[1]
  • Growth: Moderate (phasic reproductive cycles observed) ^[1]
  • Development: Unknown. Based on related Dorylinae species, expect 6-10 weeks at optimal conditions ^[1]. (Pupae lack cocoons ^[1].)
• Antkeeping:
  • Temperature: Tropical species from Borneo. Keep warm (suggested 24-28 °C) with a gradient, as exact requirements are unknown ^[1].
  • Humidity: Keep the nest substrate moderately moist but not waterlogged. They naturally nest in rotting wood and soil ^[1].
  • Diapause: Unknown, but unlikely to require cooler winter temperatures given tropical origin.
  • Nesting: Provide a naturalistic setup with pieces of rotting wood and moist soil. A Y‑tong (AAC) or plaster nest with small chambers also works. They prefer dark spaces ^[1].
• Behavior: Workers are completely blind (no eyes) and rely on chemical pheromones for navigation ^[1]. They are obligate ant predators that raid other colonies for brood. They will kill but not eat termites or mealworms ^[1]. Escape prevention is important, use fluon or oil barriers on the outworld walls.
• Common Issues: obligate ant predator, will starve without a regular supply of ant brood ^[1]., workers are blind and sensitive to light, keep the nest area dark ^[1]., pupae lack cocoons, may be vulnerable to humidity fluctuations ^[1]., tropical species, may not tolerate long periods below 24 °C., phasic reproductive cycles, colony activity may vary, males are produced from worker‑laid eggs ^[1]., queen may not mate in captivity, workers will then only produce males ^[1].

Housing and Nest Setup

Syscia yekzoeae workers are blind and need a setup that mimics their natural habitat under rotting wood and in soil ^[1]. A naturalistic terrarium with a moist earth/soil mixture and pieces of rotting wood or bark works best. Alternatively, a Y‑tong (AAC) or plaster nest with narrow chambers scaled to their 3.6-4.1 mm size provides good visibility. Keep the nest area dark, workers have no eyes and are light‑sensitive. Provide a separate outworld for feeding. Escape prevention is important, use fluon or oil barriers on the outworld walls.

Feeding and Diet - Critical

This species is an obligate ant predator: it eats only ant brood (larvae and pupae). In captivity, they accepted Tetramorium bicarinatum brood ^[1]. They will kill young termites and mealworms but refuse to eat them ^[1]. You must provide a regular supply of ant brood from another colony (e.g. Tetramorium, small Formica) or purchase fresh brood. Do not offer standard ant foods, honey, or other insects. Feed brood 2-3 times per week, removing uneaten pieces within 24 hours.

Temperature and Care

Syscia yekzoeae comes from tropical Borneo and likely needs warm conditions ^[1]. A temperature gradient of about 24-28 °C is suggested. Use a heating cable on top (not underneath) of the nest to avoid drying the substrate. Monitor with a thermometer, room temperature may be too cool. Keep humidity moderate, the substrate should be damp but not waterlogged, with good ventilation to prevent mold.

Colony Structure and Reproduction

Queens are brachypterous (non‑functional wings) ^[1]. The type series included 2 queens,6 workers, and 1 male, but whether colonies are monogynous or polygynous is unknown. Workers have 2 ovarioles (1 per ovary), dissected queens had 8 ovarioles (4 per ovary) ^[1]. During six months of captivity, workers laid unfertilized eggs that produced 11 males, and the colony went through four phasic reproductive cycles ^[1]. The queen’s spermatheca was empty, confirming male production from worker‑laid eggs. If the queen dies or remains unmated, workers may continue producing males but no new workers.

Behavior and Foraging

Workers are completely blind (no eyes) and navigate entirely using chemical pheromones, typical for Dorylinae ants ^[1]. As obligate ant predators, they raid other colonies to steal brood. They are not visually oriented, so keep the nest dark. Their foraging is driven by chemical trails, when they locate prey, they release alarm pheromones to recruit nestmates. They are not aggressive toward each other. Their size (3.6-4.1 mm) makes them relatively easy to observe, but escape prevention is still important.

Frequently Asked Questions

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References