Cephalotes cordiae

Cephalotes cordiae

Cephalotes cordiae is a striking turtle ant species native to the Amazon basin region of South America, found in Bolivia, Brazil, and Peru. Workers are entirely black with a distinctive flattened head and thorax, measuring 5.3-5.9mm, while soldiers (majors) are larger at 6.9-7.5mm with a notably expanded head. Queens reach about 10mm and are the largest caste. This species belongs to the basalis clade, characterized by having only a pair of spines on the propodeum and the highest HBaI (head breadth to alitrunk index) in the clade at 53-57.5. Like all Cephalotes, they are arboreal nesters, typically inhabiting hollow twigs, branches, and tree cavities in tropical forest canopies. Their most unusual trait is their ability to form living chains and bridges between branches using their specialized feet, allowing them to cross gaps that would otherwise be impassable.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Amazon basin region of South America, Bolivia, Brazil (Acre), and Peru. They live in tropical forests, nesting in hollow twigs and branches in the canopy ^[1].
• Colony Type: Monogyne (single-queen colonies). Turtle ants typically have one queen per colony, with soldiers serving as colony defenders and resource processors.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: 10mm ^[1]
  • Worker: 5.3-5.9mm ^[1]
  • Colony: Unknown for this specific species, but related Cephalotes species typically reach several hundred workers
  • Growth: Moderate, turtle ant colonies grow more slowly than many Myrmicinae due to their arboreal lifestyle and specialized caste system
  • Development: Estimated 8-12 weeks based on related Cephalotes species at tropical temperatures (25-28°C) (Development time is temperature-dependent, warmer conditions within the safe range accelerate development. First workers (nanitics) are smaller than mature workers.)
• Antkeeping:
  • Temperature: Keep at 24-28°C (tropical conditions). A gentle gradient is preferred, with the nest area at the warmer end. Avoid temperatures below 22°C as this species is adapted to consistently warm, humid conditions.
  • Humidity: High humidity is essential, aim for 70-85% relative humidity. These ants come from the humid Amazon basin, so the nest substrate should remain consistently moist but not waterlogged. Mist the outworld regularly and provide a water source.
  • Diapause: No, this is a tropical species that does not require hibernation. Maintain consistent warm temperatures year-round.
  • Nesting: In captivity, they do well in Y-tong (AAC) nests or plaster nests with narrow chambers scaled to their size. They prefer dark, enclosed spaces that mimic their natural tree-cavity nesting. Provide multiple connected chambers for the colony to organize their brood and food storage.
• Behavior: Turtle ants are generally calm and non-aggressive compared to many Myrmicinae. Workers are active foragers that search for nectar, honeydew, and small insects. Soldiers use their enlarged heads to block nest entrances and defend against predators. They are excellent climbers and will readily walk up smooth surfaces, so escape prevention must be excellent, apply Fluon or similar barriers to all enclosure edges. They may form temporary chains or clusters when exploring the outworld.
• Common Issues: escape prevention is critical, they are excellent climbers and will find any gap, tropical humidity requirements can lead to mold if ventilation is poor, colonies may decline if temperatures drop below 22°C for extended periods, soldiers may block nest connections if chambers are too large, restricting colony movement, wild-caught colonies may have parasites or be stressed from collection

Housing and Enclosure Setup

Cephalotes cordiae requires careful enclosure setup to thrive in captivity. A Y-tong (acrylic and cement) nest works well because it provides the dark, enclosed conditions they prefer while allowing you to observe colony activity. The chambers should be appropriately sized, not too large, as soldiers will block overly wide passages. A test tube setup can work for founding colonies, but you'll need to transition to a proper nest once the colony reaches 20-30 workers. The outworld should be escape-proof with a barrier like Fluon applied to the upper rim, these ants are excellent climbers and will exploit any gap. Include natural decorations like twigs and leaves to provide climbing surfaces and enrichment. A humidity reservoir (water tube attached to the nest) helps maintain the moisture levels they need. ^[1]

Feeding and Nutrition

Turtle ants are omnivorous with a preference for carbohydrate sources. Offer sugar water (1:1 ratio) or honey diluted with water as a constant food source, they will readily consume these. They also need protein from small insects like fruit flies, small crickets, or mealworms. In the wild, they forage for nectar and honeydew from aphids and scale insects, so replicating this diet in captivity works well. Feed protein prey 2-3 times per week, removing any uneaten prey after 24 hours. Fresh water should always be available. Some keepers report that Cephalotes prefer liquid foods and may ignore solid sugar sources, so prioritize honey water or sugar water in shallow containers. ^[1]

Temperature and Seasonal Care

As a tropical species from the Amazon basin, Cephalotes cordiae requires warm, stable temperatures year-round. Maintain nest temperatures between 24-28°C with minimal fluctuation. A small heating cable or mat placed on one side of the nest can create a gentle gradient, but avoid direct heat that could dry out the nest. Room temperature may be sufficient if your home stays in the low-to-mid 20s°C. Unlike temperate species, they do not enter diapause or hibernation, maintaining consistent conditions year-round is essential for colony health. Cold stress can weaken the colony and make them susceptible to disease. Monitor for signs of chilling if temperatures drop, including reduced foraging activity and clustering behavior.

Behavior and Colony Dynamics

Cephalotes cordiae exhibits the fascinating behaviors characteristic of turtle ants. Workers are active foragers that search systematically through the outworld, while soldiers (majors) primarily serve as defenders and food processors, their enlarged heads allow them to block nest entrances against intruders. You may observe workers tandem-running (following each other in a line) to new food sources, a common recruitment behavior in this genus. The colony will establish distinct zones for brood rearing, food storage, and waste. Soldiers may cluster near the nest entrance, acting as living doorways. The colony grows gradually, with new workers emerging over weeks and months rather than days. Patience is key, turtle ant colonies are long-lived and can persist for many years with proper care. ^[1]

Escape Prevention

Excellent escape prevention is non-negotiable for this species. Cephalotes cordiae workers are small (under 6mm) and excellent climbers with specialized adhesive pads on their feet that allow them to walk up smooth surfaces including glass and plastic. Apply a barrier such as Fluon (polytetrafluoroethylene) to all upper edges of the outworld and any potential escape routes. Check lid seals regularly and ensure any tubing connections are secure. Even small gaps that would not concern you with larger ants will allow these ants to escape. Many keepers apply two or three layers of barrier for added security. A small amount of petroleum jelly on the upper rim can also work as a temporary barrier. ^[1]

Frequently Asked Questions

References