Strumigenys hemidisca

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Mountain rainforests of Colombia and Venezuela, nesting in epiphytic plants such as orchids in tree canopies ^[1]. Recorded from Putumayo and Quindío, Colombia ^[2][3].
• Colony Type: Unknown colony structure. Only known from a few worker specimens – no queens or colony data have been published.
• Size & Growth:
  • Queen: size data unavailable – no queen has been described
  • Worker: 2.5–2.7 mm total length ^[1]
  • Colony: Unknown
  • Growth: Unknown
  • Development: no data available (No information on development time exists for this species.)
• Antkeeping:
  • Temperature: No exact data. As a tropical species from mountain rainforests, likely needs warm conditions (roughly low-to-mid 20s °C). Start around 24°C and observe.
  • Humidity: High humidity is essential based on their epiphytic habitat. Keep the nest substrate consistently moist but not waterlogged, and ensure good ventilation to prevent mold. Exact percentages are unknown.
  • Diapause: No data – likely no true diapause given the tropical origin. Maintain stable warm conditions year-round.
  • Nesting: Arboreal specialists. Provide small, tight chambers in plaster, Y-tong, or test tube setups that retain moisture. Epiphytic bark or moss can be added for structure. Avoid large open spaces.
• Behavior: These are very small, delicate ants. They are likely predatory, using their mandibles to capture tiny prey. Their minute size (2.5 mm) makes escape prevention critical. They have a functional sting (typical of the tribe Attini) but pose no serious threat to humans. Keep disturbances minimal.
• Common Issues: escape prevention is critical – they can slip through tiny gaps and standard ant barriers, high humidity requirements can lead to mold if ventilation is insufficient, feeding live micro-prey (springtails, fruit fly larvae) is necessary and may be challenging to provide regularly, this species is virtually unavailable in the hobby, so advice is based on limited data

Housing and Escape Prevention

Strumigenys hemidisca workers are extremely small (2.5–2.7 mm) ^[1], so escape prevention is your top priority. Use fine mesh (0.5 mm or smaller) on all ventilation holes and seal any gaps in test tube setups or nest boxes. These ants naturally nest in tight spaces among epiphytes, so provide snug chambers – for example, a test tube with a cotton plug and a narrow water reservoir, or a small plaster nest with multiple tiny cells. Avoid acrylic or large open enclosures. Cover nests to keep them dark and humid.

Feeding and Diet

Like other Strumigenys, this species is believed to be a predator of tiny soil invertebrates. In captivity, offer live springtails as a staple – they are the right size and provide necessary nutrients. Small fruit fly larvae, booklice, or mites may also be accepted. Do not rely on sugar water or honey, these ants are almost certainly carnivorous and need protein-rich prey. Feed every 2–3 days in small amounts, removing any uneaten prey after 24 hours to prevent spoilage. The exact dietary requirements are unknown, so observation is key.

Temperature and Humidity

No precise data exists for this species. In their native mountain rainforests in Colombia and Venezuela, they experience warm, stable temperatures and high humidity year-round ^[2][3]. Keep the nest area around 24°C as a starting point, and maintain a humidity gradient: one moist area (substrate damp) and one drier zone to avoid mold. Monitor moisture levels daily, and provide good airflow. If the ants cluster near water sources, increase moisture gradually, if mold appears, improve ventilation.

Natural History and Rarity

Strumigenys hemidisca has been collected only a handful of times, almost always from orchids or other epiphytes imported from Venezuela or Colombia to the U.S. in plant quarantine ^[1]. It is believed to be an arboreal dacetine ant, with uniquely shaped propodeal lamellae that are semicircular and lack any teeth or lobes ^[1]. Its natural colony structure, queen morphology, and founding behavior are completely unknown. Because so few specimens exist, almost every aspect of its captive care is guesswork. If you manage to obtain a colony, treat it as an experimental species.

Frequently Asked Questions

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References