Camponotus extensus

Camponotus extensus

Camponotus extensus is a large Australian carpenter ant in the Camponotus maculatus species complex. Workers measure 7-9mm with a strong size dimorphism between major and minor workers, you'll typically see either large majors or small minors, with few medium workers in between ^[1]. The head and gaster are dusky black, and the species has moderate erect hairs on the gaster with short, obliquely-erect hairs on the tibiae. These ants are mostly nocturnal and nest at honey bait in their native Queensland, Australia habitat ^[2]. A distinctive feature is the occipital carina (a ridge on the back of the head) present in minor workers but absent in majors ^[1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Queensland, Australia. Found across the Australasian region in tropical to subtropical climates ^[3]. In the wild, they nest in various cavities and are often attracted to sweet baits.
• Colony Type: Likely single-queen (monogyne) colonies based on typical Camponotus patterns. No specific multi-queen documentation found for this species.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 12-15mm based on genus patterns for large Camponotus species
  • Worker: 7-9mm ^[1]
  • Colony: Likely several thousand workers at maturity based on typical Camponotus colony development
  • Growth: Moderate, typical for large carpenter ants
  • Development: Estimated 6-8 weeks at optimal temperature based on Camponotus genus data (Large Camponotus species typically take 6-8 weeks for complete development. First workers (nanitics) are smaller than normal workers.)
• Antkeeping:
  • Temperature: Keep around 24-28°C. As an Australian species from Queensland, they prefer warm conditions. A heating cable on one side of the nest creates a suitable gradient ^[1].
  • Humidity: Moderate humidity around 50-60%. These ants are not overly humidity-dependent but should have access to some moisture. A water test tube connected to the nest provides drinking water.
  • Diapause: Unknown for this specific species. Queensland has mild winters, so a reduced activity period may be beneficial but is not strictly required. Consider a cool period around 15-18°C for 2-3 months if the colony shows reduced activity.
  • Nesting: Y-tong (AAC) nests work well for their size. Large test tube setups work for founding colonies. They prefer tight-fitting chambers. Given their nocturnal nature and tendency to nest in cavities, they do well in formicariums with multiple connected chambers.
• Behavior: These ants are mostly nocturnal in the wild, meaning they're more active in evening and night hours in captivity ^[2]. They are not particularly aggressive but will defend their nest if threatened. Major workers have strong mandibles for their size. Escape prevention should be moderate, they're large enough that standard barriers work well, but they can climb smooth surfaces. They are attracted to sweet foods (honey bait) and will readily accept sugar water. When disturbed by bright light, they quickly scatter ^[1].
• Common Issues: colonies may struggle if kept too cold, maintain warm temperatures, nocturnal activity pattern may concern keepers who expect daytime activity, large size requires appropriately sized formicarium chambers, wild-caught colonies may have parasites that affect captive survival, queen mortality during founding is possible, claustral queens seal themselves in and rely on stored fat

Housing and Nest Setup

For founding colonies, use a standard test tube setup with a water reservoir. The queen will seal herself into a dark chamber and remain there while raising her first brood. Once you have 20+ workers, you can move to a Y-tong (AAC) formicarium or a large test tube setup. These ants need chambers large enough for their majors to move through comfortably. Because they're nocturnal, they appreciate darker nesting areas, avoid placing the nest in direct bright light. A connected outworld for foraging allows them to venture out for food. Escape prevention should include fluon on rim edges and a barrier strip, though their large size makes them less likely to escape than tiny ants. ^[1]

Feeding and Diet

Camponotus extensus is attracted to sweet foods, honey water and sugar water are readily accepted. They also need protein sources like mealworms, crickets, or other insects. In the wild, they're known to nest at honey bait ^[2], showing their strong preference for sugars. Feed sugar water constantly (refresh every few days) and offer protein prey 2-3 times per week. Remove uneaten prey after 24-48 hours to prevent mold. Fresh fruit can also be offered occasionally. Make sure they always have access to clean water.

Temperature and Heating

As an Australian species from Queensland, Camponotus extensus prefers warmer temperatures. Keep the nest area at 24-28°C for optimal brood development. You can use a heating cable placed on top of the nest (never underneath where it would dry out the substrate) to create a gentle warmth gradient. Room temperature may be sufficient if your home stays in the low-mid 20s°C. If workers cluster near the warm side, the temperature is good. If they avoid the heated area, reduce heat. Cold temperatures will slow or stop brood development and can weaken the colony. ^[1]

Colony Development

The colony starts with a claustral queen who seals herself in and does not leave to forage. She relies on stored fat reserves to survive until her first workers emerge. This founding period typically takes 6-8 weeks. The first workers (nanitics) are smaller than normal workers but will begin foraging for food. After that, the colony grows steadily as more workers hatch. Major workers develop as the colony matures, these large workers have distinctively tapered heads and are specialized for defense and seed processing. A mature colony can reach several thousand workers. Growth is moderate, expect several years to reach a large colony. ^[1]

Behavior and Activity

These ants are primarily nocturnal in the wild, meaning they're most active during evening and night hours ^[2]. In captivity, you may see them adjusting their activity patterns to match feeding schedules and ambient light. They are not aggressive toward keepers but will bite if handled roughly or if their nest is threatened. When disturbed by bright light (like a torch), they quickly scatter, this is a documented escape behavior ^[1]. They are good climbers and can scale smooth surfaces, so use appropriate barriers. The presence of both major and minor workers creates an interesting dynamic where majors handle tougher tasks.

Frequently Asked Questions

References