Cephalotes auricomus

Cephalotes auricomus

Cephalotes auricomus is a striking turtle ant species endemic to Hispaniola (Dominican Republic and Haiti). Workers are medium-sized at 5.7-7mm with a distinctive black body featuring dense, thick golden hairs covering the back of the head, middle body section, and waist segments. The frontal carinae and antennae are dark orange to light brown, adding to their distinctive appearance. Queens are larger at 9.8-10mm. This species belongs to the hamulus group, which notably lacks soldiers, all workers are the same size. They nest in small chambers within dead twigs and branches still attached to living trees, typically at elevations between 185-720m in lowland moist forests.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Hispaniola island, Dominican Republic and Haiti. Found in lowland moist forests at elevations of 185-720m, nesting in dead branches of standing trees ^[1][2].
• Colony Type: Monogyne (single queen) colonies. One documented nest contained approximately 500 workers with ~200 alates including 24 gynes and 151 males ^[1][2]. The hamulus group lacks soldiers entirely ^[3].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: 9.78-10.00 mm ^[4]
  • Worker: 5.72-7.04 mm ^[5][4]
  • Colony: Up to ~500 workers in established colonies ^[1][2]
  • Growth: Moderate
  • Development: 6-10 weeks (estimated based on typical tropical Cephalotes) (Development time is estimated, no specific study exists for this species. Tropical Cephalotes species typically develop in 6-10 weeks at warm temperatures.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. These are tropical ants from the Caribbean, so warmth is important. A gentle gradient allowing cooler areas around 22°C is beneficial.
  • Humidity: High humidity (70-85%). They come from moist forest habitats. Keep nest substrate consistently damp but not waterlogged.
  • Diapause: No, being tropical, they do not require hibernation. Maintain warm conditions year-round.
  • Nesting: Arboreal nesting, they naturally nest in small chambers inside dead twigs and branches attached to living trees. In captivity, they do well in wooden formicaria, cork nests, or acrylic setups with narrow chambers that mimic their natural twig nesting sites. Test tubes can work but may need to be positioned horizontally to simulate branch cavities.
• Behavior: Docile and slow-moving. They rely on their armored shell-like appearance for defense rather than aggression. Workers forage during the day and establish trail networks between trees and across branches. They recruit nestmates to food sources. Workers are occasionally found on the ground when trails cross between trees. Escape risk is moderate, they are not particularly fast but can climb smooth surfaces. Use standard barrier methods.
• Common Issues: tropical species requires consistent warmth, cold temperatures will slow or stop development, arboreal nesting means they need appropriate nest structures, horizontal chambers work better than vertical tubes, slow colony growth can test keeper patience, established colonies reach ~500 workers, high humidity needs must be balanced with ventilation to prevent mold, wild-caught colonies may have Wolbachia bacterial infections (common in this genus), generally not harmful but present in most wild colonies ^[6][7]

Nest Preferences and Housing

Cephalotes auricomus is an arboreal species that naturally nests in small chambers within dead twigs and branches still attached to living trees. In captivity, they do best in nests that mimic these conditions, horizontal or slightly angled chambers that simulate hollow twigs. Wooden formicaria, cork nests, or custom acrylic nests with appropriately sized chambers work well. The chambers should be snug for the workers, these ants prefer tight spaces that match their natural twig cavities. Test tubes can work if positioned horizontally, but the ants may not utilize them as naturally as dedicated arboreal nests. Provide a spacious outworld for foraging since these ants are active foragers that establish trail networks. ^[1][2]

Feeding and Diet

Like other Cephalotes species, these ants are omnivorous with a preference for carbohydrate sources. They naturally forage for honeydew from sap-sucking insects and will attend aphid or scale insect colonies. In captivity, offer sugar water (honey or sucrose solution) regularly as a staple. They also accept small insects like fruit flies, small crickets, and mealworms. Offer protein sources 2-3 times per week. Unlike some aggressive foragers, they are relatively slow-moving and may not compete well for live prey with faster ant species. Their recruitment behavior means once food is discovered, workers will bring nestmates, place food in accessible locations in the outworld. ^[1][2]

Temperature and Seasonal Care

Being a tropical species from the Caribbean, Cephalotes auricomus requires warm temperatures year-round. Keep the nest area at 24-28°C for optimal brood development. A slight temperature gradient is beneficial, around 22°C in cooler areas and up to 28°C in warmer zones. Room temperature may be sufficient if your home stays in the low-to-mid 20s°C range. If needed, use a heating cable on one side of the nest (placed on top to avoid drying). Unlike temperate species, they do not require a winter diapause period. Maintain consistent warmth throughout the year, temperature drops below 20°C can slow development significantly. The elevation range of 185-720m in their natural habitat suggests they can tolerate slightly cooler conditions than pure lowland species, but warmth is still preferred. ^[1][2]

Behavior and Colony Dynamics

This species forms monogyne colonies with a single queen. The hamulus group (which includes C. auricomus) is unique in that it lacks soldiers entirely, all workers are the same size and there is no major/minor caste differentiation. Colonies can reach around 500 workers in established nests. Workers are diurnal foragers, active during the day, and establish trail networks that can extend between trees and across branches. They recruit nestmates to food sources through tandem running or chemical signaling. Workers are occasionally found on the ground when trails connect different trees. The colony structure shows a male-biased sex ratio (roughly 10 males per queen), which is unusual compared to many ant species. The ants are docile and rely on their armored appearance for defense rather than aggressive behavior. ^[1][2][3]

Humidity and Water Requirements

Cephalotes auricomus comes from moist lowland forests in the Dominican Republic, so they need high humidity. Aim for 70-85% relative humidity in the nest area. Keep the nest substrate consistently moist but avoid waterlogging, the substrate should feel damp but not have standing water. Rehydrate based on condensation levels and substrate moisture rather than a fixed schedule. In wooden or cork nests, you may need to mist occasionally or provide a water tube. In acrylic nests, a water reservoir or moist cotton works well. Balance humidity with adequate ventilation to prevent mold growth, which can be problematic in always-wet setups. The small chamber sizes in their natural nests help maintain micro-humidity, so tight-fitting nest lids help maintain proper moisture levels. ^[1][2]

Frequently Asked Questions

References