Colobopsis concavitruncata

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Known only from the type locality in San Blas, Nayarit, Mexico, a coastal tropical region. In the wild, Colobopsis species typically nest in rotting wood, hollow stems, and bamboo ^[2].
• Colony Type: Unconfirmed, only the queen has been described. Major workers, minor workers, and males remain unknown ^[1].
• Size & Growth:
  • Queen: Size data unavailable, the original description provides head and mesosoma measurements but not total body length ^[1].
  • Worker: Unknown, major and minor workers have not been described ^[1].
  • Colony: Unknown, colony size has not been documented.
  • Growth: Unknown, no development data exists for this species.
  • Development: Unknown, no direct observations for this species. (Development data is unavailable.)
• Antkeeping:
  • Temperature: Keep at 22-26°C. Being from coastal Mexico, they likely prefer warm, stable conditions. A heating cable on one side of the nest creates a suitable gradient.
  • Humidity: Moderate to high humidity around 60-80%. Colobopsis species typically nest in rotting wood which maintains internal moisture. Keep the nest substrate consistently damp but not waterlogged.
  • Diapause: Unknown for this species. Many Mexican ants experience reduced activity during cooler dry seasons, but specific requirements are unstudied.
  • Nesting: Use a Y-tong (AAC) nest or plaster nest with narrow chambers. These ants are small and prefer tight, enclosed spaces. Naturalistic setups with rotting wood or bamboo sections also work well. The nest should have small entrance holes that workers can plug with their specialized heads.
• Behavior: Colobopsis ants are generally peaceful and not aggressive. Workers are shy and will retreat rather than attack. The most notable behavior is their use of the truncated head as a living door, workers can plug nest entrances with their flat, concave head capsule. This species lacks a functional sting, as with other Formicinae, they may bite and spray formic acid as defense. Escape risk is moderate due to their small size, use standard barrier methods. They are primarily arboreal, nesting in wood and plant cavities in nature.
• Common Issues: no documented biology makes captive care speculative, expect a learning curve, worker caste unknown means you may not be able to identify workers correctly, extremely limited range means captive colonies are likely rare and potentially expensive, humidity control is critical, too dry and brood will desiccate, too wet and mold becomes a problem, this species was only described in 2018,so husbandry techniques are not well-established

Nest Preferences

Colobopsis concavitruncata is expected to nest in rotting wood, hollow stems, and plant cavities based on genus behavior. In captivity, Y-tong (AAC) nests work well because they provide the dark, enclosed spaces these ants prefer. The nest should have small entrance holes, typically 3-5mm in diameter, that allow workers to use their specialized head as a living plug. Plaster nests can also work if kept consistently moist. Avoid dry, exposed setups. The nest chambers should be relatively small and tight-fitting to the ant size. If using a naturalistic setup, provide pieces of rotting wood or bamboo with pre-drilled entrance holes. ^[1][2]

Feeding and Diet

Like other Colobopsis species, this ant is likely omnivorous with a preference for honeydew and small insects. Feed sugar water or honey water as a constant energy source. Offer small protein sources like fruit flies, pinhead crickets, or mealworm pieces. In the wild, these ants tend aphids and feed on nectar. Since workers have not been described, their exact foraging preferences are unknown. Feed small amounts twice weekly and remove uneaten prey within 24 hours to prevent mold. ^[2]

Temperature and Care

Keep Colobopsis concavitruncata at 22-26°C. Being from coastal Nayarit, Mexico, they prefer warm, stable conditions without temperature swings. A heating cable placed on top of one end of the nest creates a gentle thermal gradient, allowing the colony to self-regulate. Room temperature in the low-to-mid 20s°C is often suitable. Avoid temperatures below 18°C or above 30°C. Humidity should be moderate to high (60-80%). Use a water reservoir in test tube setups or mist the nest area regularly, allowing it to dry slightly between mistings.

Behavior and Temperament

Colobopsis ants are known for their unique defensive behavior, workers use their flattened, disk-like head as a living door to seal nest entrances. When threatened, workers can plug the entrance hole with their head, making it difficult for predators to enter. This species is not aggressive and workers will more likely retreat than bite. As Formicinae, they lack a functional sting but may bite and spray formic acid as defense. Workers are small and may be able to squeeze through small gaps, so use standard barrier methods like fluon on test tube rims. Activity levels are moderate, they will forage but are not hyperactive. ^[2]

Colony Establishment

Since only the queen has been described for this species, founding colonies will likely come from newly caught queens. The founding behavior for this specific species is unconfirmed. The first workers (nanitics) will be smaller than mature workers. Major and minor worker castes have not been described, so you may need to wait for several generations to observe the full worker morphology. Be patient, founding colonies can take several months to establish. ^[1]

Frequently Asked Questions

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References