Cylindromyrmex brevitarsus - "N/A (No widely recognized common name)"
Cylindromyrmex brevitarsus is a unique ant species from the Dorylinae subfamily, known for its cylindrical body shape and somewhat cryptic nature. Workers are typically dark brown, with light brown to yellowish-orange legs that often have darker coxae and basitarsi. They possess small, flat compound eyes with a limited number of ommatidia, positioned on the posterior half of the head. These ants are predatory, primarily preying on termites, and are known to nest in decaying wood, hollow stems, or even termite galleries. Queens can vary remarkably in size, with total lengths ranging from approximately 5.88 mm to 9.40 mm, while workers are smaller, typically between 4.20 mm and 6.44 mm.
- Difficulty: Hard
- Origin & Habitat: Neotropics (Central America to Brazil, Bolivia, and the Galápagos Islands), specifically from Veracruz in Mexico to Santa Catarina in Brazil, including Guatemala, Costa Rica, Panama, Colombia, Peru, Bolivia, and Chile. in Montane wet forests, mesophil forests, mature cloud forests, and tropical moist forests. They are typically found in cavities within sound or rotten wood, under bark, or in hollow stems of standing or fallen plants..
- Colony Type: Monogyne, claustral founding.
- Size & Growth:
- Queen: 5.88-9.4mm
- Worker: 4.2-6.44mm
- Colony: Small (hundreds). Slow growth.
- Antkeeping:
- Temperature: Due to their natural habitat in tropical and montane forests, a stable temperature range of 24-28°C is likely suitable. One study noted an average temperature of 26°C in a habitat where Cylindromyrmex species were found..
- Humidity: High humidity is essential, likely above 70%, reflecting their natural forest environments. One study noted an average relative humidity of 71.5% in a habitat where Cylindromyrmex species were found..
- Diapause: Not required. Not specified at Not specified.
- Nesting: These ants prefer nesting in pre-existing cavities within wood, such as sound or rotten logs, under bark, or inside hollow stems. Therefore, a naturalistic setup with decaying wood or a specialized formicarium designed to mimic such cavities would be ideal..
- Behavior: Medium (towards prey, potentially defensive towards handler) aggressiveness.
- Common Issues: Lack of suitable live prey (termites), Inadequate humidity leading to desiccation, Stress from excessive disturbance, Difficulty in establishing new queens.
Cylindromyrmex brevitarsus, like other Cylindromyrmex species, is a specialist predator. Their primary diet in the wild consists of termites, which makes providing appropriate food a crucial aspect of their care in captivity. You'll need a consistent supply of live termites, or suitable substitute feeder insects if termites are unavailable, to ensure their nutritional needs are met. Observing their natural hunting behaviors, such as stinging prey and mass recruitment, can be a fascinating part of keeping them, but it also means their feeding habits are quite specific and not easily substituted with typical ant food sources like sugars or seeds.
These ants are quite cryptic, meaning they prefer to stay hidden within their nests or foraging within leaf litter and subterranean areas. This behavior dictates that their formicarium should provide ample hiding spots and a substrate that allows for tunneling and exploration, such as soft wood. Transparency of the nest might be limited to prevent stress, and observation may require specific red light setups or minimal disturbance. Their small, flat eyes suggest they rely less on vision and more on other senses for navigation and hunting, further emphasizing their preference for darker, enclosed spaces.
Colony growth for Cylindromyrmex species is generally slow, with an estimated mean colony size of around 100 individuals. This isn't a species that will quickly fill a large formicarium. Patience is key, as rapid expansion isn't their natural tendency. Be prepared for a long-term commitment to a relatively small but intricate colony. This slow growth also means that any disruptions or stress can have a more significant impact on the colony's overall health and development.
The queens of Cylindromyrmex brevitarsus are typically winged, and brood production appears to be synchronized. This suggests a more claustral founding method, where the queen seals herself away to raise her first brood without foraging. This is an important consideration for new queen setups, as they will likely require a secure, undisturbed founding chamber with high humidity. Ensuring proper conditions during this critical phase is vital for successful colony initiation.
