Bothriomyrmex corsicus - "Corsican Tapinoma Thief Ant"
Bothriomyrmex corsicus is a fascinating, small ant species renowned for its temporary social parasitic lifestyle. These ants are quite distinctive, sporting an overall yellowish coloration across their body, antennae, and legs. The workers are rather petite, typically measuring between 0.52mm and 0.65mm. Their heads are slightly elongated, and their eyes are notably small and round. A defining characteristic of the genus is their diminutive queens, who are specialized for their unique colony founding method: invading and taking over nests of host species, particularly those from the genus Tapinoma.
- Difficulty: Hard
- Origin & Habitat: Europe in This thermophilous species thrives in warm, open environments across various European countries, including France (specifically Corsica, where it was first described), Greece, Italy, Switzerland, and many others across the Palaearctic region. You'll often find their nests tucked away under stones in pastures with shrubs, luminous deciduous forests, and subalpine grasslands, typically at elevations between 210 and 850 meters. They are adapted to nesting directly in the soil or sometimes in rotten wood..
- Colony Type: Temporary Parasitic (usually Monogyne for Bothriomyrmex queen once established), temporary parasitic founding.
- Size & Growth:
- Queen: Not specified
- Worker: 0.52-0.65mm
- Colony: Small (hundreds) to Medium (thousands). Medium growth.
- Antkeeping:
- Temperature: As a thermophilous species, Bothriomyrmex corsicus prefers warmer conditions. Maintain temperatures between 24-28°C for optimal activity and brood development. Consistent temperatures within this range are crucial for a thriving colony..
- Humidity: Moderate humidity levels are best for these ants, mimicking their natural underground habitats. Aim for 50-70% humidity within the nest. It's important to provide a humidity gradient if possible, allowing the ants to choose their preferred spot..
- Diapause: Required. 3-4 months at 5-10°C.
- Nesting: In the wild, they nest under stones and in the soil. For captivity, a test tube setup is essential for initial founding with a host colony. Once established, they do well in acrylic, Ytong, or naturalistic setups that allow for a soil layer. Nests with good visibility and options for moisture control are ideal..
- Behavior: High (towards host queen during invasion, low towards handler) aggressiveness.
- Common Issues: Host colony rejection during founding, Difficulty in acquiring a suitable host colony, Humidity fluctuations leading to stress, Colony stalling if host workers die off too quickly, Escape artists due to small worker size.
The most captivating aspect of keeping Bothriomyrmex corsicus is their truly unique colony founding strategy: temporary social parasitism. This means a newly mated queen (or alate) doesn't start a colony from scratch on her own. Instead, she must infiltrate an existing host colony, typically a Tapinoma species. The B. corsicus queen will often eliminate the host queen, sometimes through decapitation, and then she is adopted by the host workers. This process requires a delicate touch and careful introduction, making them a challenging species for even experienced ant keepers.
Once the parasitic queen has successfully integrated into the host colony, she begins laying her own eggs. Her gaster will become physogastric, swelling significantly as she focuses on egg production. The host workers will then care for the parasitic queen's brood, raising the first generation of Bothriomyrmex workers. As these new workers mature, they gradually replace the dwindling host workforce. This transition period is critical and requires patience and a keen eye to ensure the parasitic colony thrives.
Due to their small size and specific parasitic needs, providing the right environment is paramount. A secure setup is a must, as their diminutive workers can be escape artists. While they are thermophilous, avoiding extreme heat fluctuations is important. Maintaining consistent humidity in a portion of the nest is also key to successful brood development and overall colony health. These factors, combined with the initial parasitic founding, contribute to their 'Hard' difficulty rating.
Finding a suitable host colony of Tapinoma for a founding Bothriomyrmex corsicus queen can be one of the biggest hurdles. The host colony needs to be of the correct species and size, typically a small founding colony, to increase the chances of successful adoption. Researching local Tapinoma species and their availability is highly recommended before attempting to keep B. corsicus. Their rarity in the hobby also means resources and established care guides can be scarce, adding another layer of challenge.
Frequently Asked Questions
What's the best way to get a Bothriomyrmex corsicus queen to start a colony?
Starting a colony of Bothriomyrmex corsicus is quite a unique challenge for ant enthusiasts! These queens are temporary social parasites, meaning they need a host colony to establish their own. You'll typically introduce a newly caught queen to a small, founding colony of a suitable host species, most commonly a Tapinoma ant. The trick is a careful introduction process, often involving a 'test tube method' where the queen is slowly acclimated to the host workers until they accept her. It’s a delicate dance, but incredibly rewarding when successful!
What should I feed my Bothriomyrmex corsicus colony?
Once your Bothriomyrmex corsicus colony is established, they're omnivores, much like many other ant species. They'll readily accept a varied diet of sugary liquids like sugar water or honey-water for energy, and small insects (like fruit flies, mealworm pieces, or roaches) for protein. Ensure the insect prey is freshly killed and free of pesticides. A balanced diet is essential for their growth and vitality.
Are Bothriomyrmex corsicus aggressive towards keepers?
Not at all towards their keepers! While Bothriomyrmex corsicus queens are known for their assertive behavior during colony founding, often dispatching the host queen, their workers are quite docile when it comes to human interaction. They don't possess a sting, as they belong to the Dolichoderinae subfamily which uses chemical defense. So, you can observe them safely without worry.
Do Bothriomyrmex corsicus need to go through diapause?
Yes, absolutely! Since Bothriomyrmex corsicus are native to European climates, a period of diapause (a sort of winter dormancy) is crucial for their long-term health and reproductive cycle. Typically, you'll need to cool your colony down to around 5-10°C for about 3-4 months. This chilling period helps synchronize their biological clock and ensures the queen remains fertile for the next active season.
What kind of formicarium is best for these ants?
After successful founding in a test tube, Bothriomyrmex corsicus colonies thrive in formicariums that mimic their natural nesting conditions. Options like acrylic nests, Ytong (aerated concrete) setups, or even naturalistic soil nests are great. The key is to provide a nest with consistent, albeit gradient, humidity, and escape-proof foraging areas (outworlds) due to their small worker size. They appreciate setups that allow them to dig or have a substrate layer.
How large can a Bothriomyrmex corsicus colony get?
The colony size of Bothriomyrmex corsicus can vary, but generally, they are considered to reach small to medium sizes in captivity, typically ranging from hundreds to a few thousand workers. Their parasitic founding method means the initial growth relies on the host workers, but once the Bothriomyrmex workers take over, the colony expands at a medium rate, eventually forming a cohesive unit of their own species.
Are Bothriomyrmex corsicus suitable for beginner antkeepers?
Unfortunately, Bothriomyrmex corsicus are not recommended for beginner antkeepers. Their temporary social parasitic founding method, which requires a specific host colony and a delicate introduction process, makes them quite challenging. It demands a good understanding of ant behavior and a high degree of patience. We suggest gaining experience with easier, claustral founding species before attempting a parasitic ant like this.
What host species can I use for Bothriomyrmex corsicus?
For Bothriomyrmex corsicus, the most documented and successful host species are from the genus Tapinoma. Research suggests that Bothriomyrmex queens use chemical mimicry to infiltrate Tapinoma nests. It's crucial to identify the correct native Tapinoma species in your region that co-occurs with Bothriomyrmex corsicus to maximize the chances of a successful adoption.
How long does it take for eggs to become workers?
The full development cycle from egg to worker for Bothriomyrmex corsicus, under optimal conditions, typically takes about 4 to 6 weeks. This includes the egg, larval, and pupal stages. Providing stable temperatures and appropriate humidity will help ensure a healthy and consistent brood development.
What are the common challenges of keeping this species?
The primary challenge with Bothriomyrmex corsicus is undoubtedly the initial colony founding due to their temporary parasitic nature. Host colony rejection is a common hurdle, and finding a suitable host can be difficult. Other issues can include managing precise humidity levels, as these small ants can be sensitive to fluctuations, and preventing escapes from their formicarium. Keepers also need to be prepared for the possibility of a colony stalling if the transition from host workers to their own workers isn't smooth.
