Camponotus biolleyi

Camponotus biolleyi

Camponotus biolleyi is a Neotropical carpenter ant species native to Cocos Island, Costa Rica. Workers are polymorphic, coming in both major and minor sizes, the majors being larger with more developed heads. This species belongs to the Myrmobrachys subgenus, which contains smaller, more slender carpenter ants. The species was originally described by Forel in 1902 based on specimens collected from Cocos Island. ^[1][2]

This ant remains poorly studied in the scientific literature, with limited information available about its specific biology and behavior. Like other Camponotus species, they likely nest in wood and maintain colonies with a single queen. The Cocos Island population represents the species' entire known range.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Cocos Island, Costa Rica, a remote Pacific island in the Neotropical region. They inhabit tropical forest environments where they likely nest in rotting wood or under bark. ^[1][2]
• Colony Type: Likely monogyne (single-queen colonies) based on typical Camponotus patterns. Colony size is unknown but likely reaches several hundred workers in mature colonies.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 12-15mm based on genus patterns, not directly measured for this species
  • Worker: Minor workers: 4-6mm, Major workers: 7-10mm based on subgenus Myrmobrachys morphology ^[2]
  • Colony: Unknown, estimated several hundred workers based on typical Camponotus colony sizes
  • Growth: Moderate, typical for tropical Camponotus species
  • Development: 6-8 weeks at optimal temperature based on typical Camponotus development ^[2] (Development time is inferred from genus patterns, direct measurements for this species are unavailable. Tropical species typically develop faster than temperate ones.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. A heating cable on one side of the nest creates a temperature gradient that allows ants to regulate their own conditions. This species comes from a tropical island environment and prefers consistent warmth. ^[2]
  • Humidity: Moderate to high humidity (60-80%). Keep the nest substrate slightly moist but not waterlogged. Cocos Island has a humid tropical climate, so they appreciate moisture but need ventilation to prevent mold. ^[2]
  • Diapause: No, this is a tropical species from Cocos Island which has no true winter. They remain active year-round but may slow slightly during cooler periods. ^[2]
  • Nesting: Y-tong (AAC) nests or plaster nests work well for this species. They prefer narrow chambers scaled to their size. In captivity, they readily accept acrylic or ytong formicariums. Provide some damp substrate for brood chambers. ^[2]
• Behavior: Typical Camponotus temperament, generally calm and not aggressive toward keepers. Workers are moderately active and will forage for sugar and protein. Major workers can deliver a mild sting if threatened, though Myrmobrachys species are less aggressive than some other carpenter ants. They are moderate escape artists, ensure your formicarium has tight-fitting barriers and consider fluon on edges. ^[2]
• Common Issues: limited species-specific information means care is based on genus patterns rather than direct observation, tropical species may be sensitive to temperature drops, avoid keeping them in cool rooms, colonies grow slowly initially, patience is required during the founding stage, escape prevention is important especially for minor workers who can squeeze through small gaps, wild-caught colonies from Cocos Island may carry parasites or not adapt well to captivity

Housing and Nest Setup

Camponotus biolleyi does well in Y-tong (AAC) nests or plaster formicariums. These provide the dark, humid environment they prefer. Use chambers scaled to colony size, start with smaller chambers when the colony is young and expand as it grows. A test tube setup works well for the founding queen. Once the colony reaches 10-20 workers, you can move them to a proper formicarium. Add a water reservoir to maintain humidity, and consider adding a small outworld for foraging. Ensure all connections are secure, these ants can squeeze through surprisingly small gaps. ^[2]

Feeding and Diet

Like other Camponotus species, C. biolleyi is omnivorous. Offer sugar water, honey, or diluted maple syrup as a constant energy source. For protein, provide small insects like fruit flies, small crickets, or mealworms. They likely collect honeydew in nature, so sweet liquids are important for colony health. Feed protein 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24-48 hours to prevent mold. This species should accept standard ant feeds without issue. ^[2]

Temperature and Heating

Maintain temperatures between 24-28°C for optimal brood development. This tropical species from Cocos Island prefers consistent warmth. Use a heating cable or heat mat placed on one side of the nest to create a temperature gradient, this allows workers to move between warmer and cooler areas as needed. Avoid temperatures below 20°C for extended periods. Room temperature may be sufficient if your home stays in the low-to-mid 20s°C range, but monitoring is recommended. Cold stress can weaken colonies and slow or stop brood development. ^[2]

Colony Founding

The queen will seal herself into a claustral chamber, this is typical Camponotus behavior. She relies entirely on her stored fat reserves to survive and raise the first brood. Do not disturb her during this phase. The founding chamber should be dark and humid. After 4-8 weeks (depending on temperature), the first nanitic workers will emerge. These initial workers are smaller than normal workers but will begin foraging for food to support the growing colony. Only offer food once workers have emerged, the queen does not leave the chamber during founding. ^[2]

Growth and Development

Colony growth is initially slow during the founding phase. Once the first workers emerge, growth accelerates but remains moderate compared to some faster-growing genera. A healthy colony may reach 50-100 workers within the first year under good conditions. Full maturity, with major workers present, typically takes 1-2 years. The presence of major (soldier) workers indicates a maturing colony. Development from egg to worker takes approximately 6-8 weeks at optimal temperature, similar to other Camponotus species. ^[2]

Seasonal Care

As a tropical species from Cocos Island, C. biolleyi does not require hibernation or diapause. They remain active year-round, though activity may decrease slightly during cooler months. There is no special winter care required, simply maintain normal temperature and feeding schedules. The stable tropical climate of Cocos Island means this species is not adapted to temperature fluctuations, so consistency is more important than seasonal adjustments. Avoid placing the nest near windows or air conditioning vents that could cause temperature swings. ^[2]

Frequently Asked Questions

References