Camponotus samius

Camponotus samius - "Samos Carpenter Ant"

Camponotus samius is a large polymorphic carpenter ant belonging to the Tanaemyrmex subgenus. Minor workers measure 4-6mm with a yellow to reddish-brown coloration, while major workers reach 7-12mm and feature a distinctly dark head contrasting with a lighter mesosoma. The gaster always shows a brighter basal section. This species is a thermophile native to the Mediterranean region, found across Greece, Turkey, Bulgaria, Cyprus, and Sicily ^[1][2]. They prefer warm, open habitats such as dry hills with sparse vegetation, pastures with shrubs, and pine forests, typically nesting under large stones ^[1]. Workers are primarily nocturnal, most active at dawn and dusk ^[1]. This species is a member of the Camponotus samius species complex and is known to host the ant cricket Myrmecophilus orientalis in its nests ^[3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Mediterranean region, Greece, Turkey, Bulgaria, Cyprus, and Sicily. Thermophile species found in pine forests, stream valleys with deciduous trees, suburban areas with maquis, pastures with shrubs, and dry hills in coastal areas. Nests located under large stones at low to mid altitudes ^[1][2][4].
• Colony Type: Single-queen colonies (monogyne). This follows typical Camponotus patterns where colonies establish with one founding queen.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Approximately 12-15mm, inferred from genus patterns and large worker size
  • Worker: Minor workers: 4-6mm (HL 1.89-2.09mm), Major workers: 7-12mm (HL 3.18-3.73mm) ^[1]
  • Colony: Likely several thousand workers, typical for large Camponotus species
  • Growth: Moderate, typical Camponotus development timeline
  • Development: 6-8 weeks at optimal temperature, inferred from typical Camponotus genus patterns (Development time follows standard Camponotus patterns. Major workers (soldiers) appear as colony matures.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This Mediterranean thermophile prefers warm conditions. A heating cable on one side of the nest creates a temperature gradient ^[4].
  • Humidity: Moderate humidity around 50-60%. Provide a water tube as a moisture source. Allow the nest to partially dry between waterings, they naturally nest under stones in well-drained soils ^[1].
  • Diapause: Yes, provide a winter rest period of 8-12 weeks at 10-15°C. This matches other Mediterranean Camponotus species and aligns with their seasonal activity pattern.
  • Nesting: Use a Y-tong (AAC) or plaster nest with chambers scaled to their large size. Provide a connection to an outworld. They naturally nest under stones, so a naturalistic setup with flat stones over soil also works well. Ensure the nest has some vertical space for major workers ^[1].
• Behavior: Nocturnal species, workers are most active at dawn and dusk ^[1]. Generally docile temperament, but major workers can deliver a painful bite if threatened. They are moderate foragers that search for honeydew and insects. Escape prevention should be moderate, they are large ants but can climb smooth surfaces. Use standard barrier methods like fluon on test tube rims.
• Common Issues: colonies may struggle if temperatures drop below 20°C for extended periods, they are true thermophiles, nocturnal activity means keepers may not see much movement during daytime hours, this is normal, major workers can block nest entrances due to their large size, ensure nest chambers are appropriately sized, wild-caught colonies may harbor parasites like the ant cricket Myrmecophilus orientalis, quarantine and observe new colonies, overheating is more dangerous than slight underheating, avoid temperatures above 32°C

Nest Preferences and Housing

Camponotus samius naturally nests under large stones in well-drained, warm locations ^[1]. In captivity, they adapt well to various nest types. Y-tong (acrylic) nests work excellently because they provide good visibility and easy temperature control. Plaster nests are also suitable, especially when you want to maintain moderate humidity. For the outworld, use a standard foraging area with a connection tube. Given their large size, ensure the connection tube is wide enough for major workers to pass through comfortably. Some keepers successfully use naturalistic setups with a layer of soil and flat stones on top, mimicking their natural nesting sites. The nest should be placed in a darker area of your setup since this is a nocturnal species that prefers dim conditions.

Feeding and Diet

Like other Camponotus species, Camponotus samius is omnivorous with a preference for protein-rich foods. In captivity, they readily accept sugar water or honey as an energy source. For protein, offer insects such as mealworms, crickets, waxworms, and other appropriately sized prey. They are known to tend aphids in the wild, in captivity, you can occasionally offer small amounts of aphid honeydew or sugar solutions ^[5]. Feed protein prey 2-3 times per week, depending on colony size. Sugar water should always be available in the outworld. Remove uneaten prey after 24-48 hours to prevent mold. This species shows increased foraging activity during evening hours, so offering food in the late afternoon or evening aligns with their natural rhythm.

Temperature and Seasonal Care

As a thermophile from the Mediterranean, Camponotus samius requires warm temperatures for optimal colony development. Maintain nest temperatures between 24-28°C. A heating cable placed on top of the nest (never underneath where it can dry out the substrate) helps create the warm conditions they need. They can tolerate brief temperature drops but prolonged cold will slow or stop brood development. During winter, provide an 8-12 week diapause period at 10-15°C, this mimics their natural seasonal cycle and helps trigger reproductive behavior in spring. Place the colony in a cool basement or refrigerator during winter hibernation. Do not feed during diapause but ensure a small water source is available. ^[1][4]

Behavior and Activity Patterns

Camponotus samius is primarily nocturnal, with workers most active during dawn and dusk ^[6]. This activity pattern means you may see limited movement during standard daytime hours, this is completely normal behavior, not a sign of problems. The colony will become more active in the evening and early morning hours. Major workers (soldiers) develop as the colony matures and serve to defend the nest and process large food items. They have the typical Camponotus bite defense, while not aggressive, they will bite if threatened. The species is known to host the ant cricket Myrmecophilus orientalis, which is a symbiotic guest that lives in their nests ^[3]. If you observe small cricket-like insects in the nest, this is likely this known symbiont and not a cause for concern.

Colony Development and Growth

As a large Camponotus species, Camponotus samius follows the typical claustral founding pattern. The queen seals herself in a chamber and raises the first brood alone, using stored fat reserves. The first workers (nanitics) are typically smaller than normal workers but grow quickly once foraging begins. Development from egg to worker takes approximately 6-8 weeks at optimal temperature, though this is inferred from typical Camponotus patterns rather than specifically studied for this species. Major workers appear as the colony reaches several hundred workers. Colonies can eventually grow to several thousand workers. Be patient during the founding phase, it can take several months before the first workers emerge, and the colony may appear inactive during this time. ^[1]

Handling and Interaction

Camponotus samius is generally docile and suitable for antkeeping, though major workers can deliver a moderately painful bite if provoked. They are not aggressive toward the nest and will typically flee rather than attack. When observing the colony, avoid disturbing the nest chamber directly. For feeding and maintenance, use tools rather than your hands. Their large size makes them easier to handle than many smaller ant species. They are good for observation, especially in the evening hours when activity peaks. The clear differences between minor and major workers make them an interesting species to watch as the colony develops polymorphism over time.

Frequently Asked Questions

References