Lasius aphidicola - "Shaded Fuzzy Ant / Parasitic Cornfield Ant"
Lasius aphidicola, often called the Shaded Fuzzy Ant or Parasitic Cornfield Ant, is a fascinating ant species known for its temporary social parasitic nature. Queens are typically medium-sized, dark gray, sometimes with yellow on their thoraxes, measuring around 6-7mm. They can be confused with other Lasius species like L. claviger or L. speculiventris, but L. aphidicola generally has shorter, bristly hairs on its gaster and a concave-topped petiole. Workers are described as reddish-orange and, while subterranean in the wild, can forage actively in captivity. This species is a social parasite, meaning the queen cannot found a colony on her own; she must infiltrate an existing host colony of another Lasius species.
- Difficulty: Medium
- Origin & Habitat: North America (Canada, United States, Mexico) in Moist soil in open woodlands, early successional forests, forest edges, farm fields, under stones, and in or about rotting logs and stumps..
- Colony Type: Monogyne, temporary parasitic (queen invades another species' nest) founding.
- Size & Growth:
- Queen: 6-7mm
- Worker: Not specified
- Colony: Medium (thousands). Medium (growth rate depends on the number of host workers and food supply) growth.
- Antkeeping:
- Temperature: Preferred temperature range is around 21-23°C (70-75°F) for optimal development, though they can tolerate a wider range..
- Humidity: They prefer higher levels of humidity, typically 60-80%, to mimic their natural subterranean environment..
- Diapause: Required. 3-5 months at 4-10°C.
- Nesting: They generally nest in moist soil under rocks, logs, and stumps. In captivity, artificial nests that allow for humidity gradients and simulate subterranean conditions, such as grout nests or setups with soil chunks, are suitable..
- Behavior: Low (towards handler), Medium (towards rival queens/unaccepted hosts) aggressiveness.
- Common Issues: Host worker rejection or aggression towards queen during founding, Difficulty acquiring suitable host species, Humidity fluctuations leading to stress, Colony stalling if host introduction fails.
One of the most crucial aspects of keeping Lasius aphidicola is understanding their temporary social parasitic founding method. Unlike fully claustral queens who can raise their first brood alone, Lasius aphidicola queens require host workers from another Lasius species to establish their colony. In the wild, the queen infiltrates a host colony, eliminates the resident queen, and then leverages the existing host workforce to raise her own offspring. This makes the initial setup a bit more involved, as you'll need to acquire a healthy group of suitable host workers or pupae, most commonly Lasius americanus or Lasius neoniger.
Successfully introducing a Lasius aphidicola queen to a host colony can be challenging, but methods like the 'Callow Method' or 'Worker Method' have proven effective. The Callow Method involves providing the queen with pupae from a host colony; once these pupae eclose, they will accept the parasitic queen as their own. The Worker Method involves carefully introducing small numbers of host workers to the queen, often starting with a few and gradually adding more as acceptance increases. Some keepers even chill the host workers to reduce aggression during the introduction phase, a technique that leverages their natural behavior in early spring invasions.
Once the colony is established and the queen's own workers (biological workers) start to emerge, the care becomes more straightforward, similar to other Lasius species. Lasius aphidicola workers are known to tend aphids for their sugary honeydew, a common behavior among many Lasius ants. Providing a consistent source of sugars, such as sugar water or honey, is essential, alongside a variety of insect protein like mealworms or fruit flies. Maintaining proper humidity is also key, as these ants are predominantly subterranean in their natural habitat and thrive in moist conditions.
While Lasius aphidicola is considered a 'starter' Lasius social parasite, their initial founding process requires patience and attention to detail. Queens can be found wandering in the spring or under debris after overwintering. If you collect a queen in the fall, she will still need to undergo diapause before she begins laying eggs and founding her colony in the spring. Observing the queen and host workers for signs of acceptance, such as workers feeding the queen, is crucial for successful integration.
Frequently Asked Questions
What makes Lasius aphidicola a 'social parasite'?
Lasius aphidicola queens can't start a colony on their own. Instead, they need to invade an existing colony of a different Lasius species, eliminate the host queen, and then rely on the adopted host workers to raise their initial brood. It’s a fascinating, albeit challenging, part of their life cycle that makes them unique in the antkeeping world.
Which host ant species are best for Lasius aphidicola?
The most common and successful host species for Lasius aphidicola include Lasius americanus and Lasius neoniger. They have also been known to parasitize Lasius minutus, Lasius nearcticus, Lasius brevicornis, and potentially others in their native range. Finding a suitable host colony with plenty of workers and brood is key to a successful setup.
How do I introduce a Lasius aphidicola queen to host workers?
The 'Callow Method' is often recommended, where you provide the queen with pupae from a host colony. Once these pupae eclose (hatch into adult workers), they'll accept the parasitic queen. Alternatively, the 'Worker Method' involves gradually introducing small groups of host workers to the queen, carefully observing for aggression and allowing them to acclimate. Chilling the host workers beforehand can sometimes help reduce initial conflict.
What should I feed my Lasius aphidicola colony?
Once established, Lasius aphidicola thrives on a diet of sugary liquids, like honey water or sugar water, and protein sources such as small insects (e.g., fruit flies, mealworms). They are known to 'farm' aphids for honeydew in the wild, so providing regular sugars is essential for their energy needs.
Do Lasius aphidicola sting or bite?
Lasius aphidicola workers are not known to sting. While they might attempt to bite if threatened, their bites are generally harmless to humans. Their main defense mechanism is formic acid, which they spray.
What kind of nest setup is best for Lasius aphidicola?
These ants prefer humid, subterranean conditions. A formicarium that offers a good humidity gradient, like a naturalistic setup with moist soil or a test tube setup connected to a hydration chamber, is ideal. Grout nests or setups with added chunks of soil or debris can also be beneficial, providing both structure and substrate for scent exchange.
How long does it take for Lasius aphidicola eggs to develop into workers?
At optimal temperatures (around 21-23°C), the development from egg to adult worker typically takes approximately 7-8 weeks. This includes about 15-18 days for eggs to hatch into larvae, 10-15 days for larvae to pupate, and then another 14-18 days for pupae to eclose into workers.
Is diapause (hibernation) required for Lasius aphidicola?
Yes, diapause is essential for Lasius aphidicola queens and colonies to complete their life cycle and ensure long-term health. In the wild, they experience cold temperatures over winter. In captivity, a cool period between 4-10°C (39-50°F) for 3-5 months is generally recommended.
Why is my Lasius aphidicola queen being aggressive towards host workers?
Initial aggression is common during the introduction phase of parasitic queens. The queen is trying to assert dominance and gain the colony's scent. It's a critical, often tense, period. Ensure the host workers are from a suitable species and consider methods like chilling the hosts or gradually introducing them to help minimize conflict. If aggression persists, the host colony might be too large or the introduction method may need adjustment.
Can Lasius aphidicola workers forage above ground?
While Lasius aphidicola are predominantly subterranean in their natural habitat, the workers can and will forage above ground in captivity. Providing an outworld for foraging and feeding will allow them to exhibit natural behaviors.
What are some common issues to watch out for with Lasius aphidicola?
The most significant challenge is the initial host introduction, where rejection or aggressive behavior from host workers towards the queen can occur. Other common issues include humidity fluctuations in the nest, which can stress the colony, and ensuring a consistent food supply to prevent colony stalling, especially during the early stages. Keeping an eye on potential mold growth in the nest, particularly with higher humidity, is also important.
How can I tell the difference between Lasius aphidicola and similar Lasius species?
Lasius aphidicola queens are often confused with Lasius claviger or Lasius speculiventris. Key identifiers for L. aphidicola include its dark gray body, sometimes with yellow on the thorax, relatively short and bristly hairs on the gaster, and a concave-topped petiole. L. claviger tends to have a wider head and be shinier, while L. speculiventris often has a shinier gaster with less pubescence.
