Acanthostichus laticornis - "Broad-horned Army Ant (though not a true army ant)"
Acanthostichus laticornis is a fascinating, predominantly subterranean ant species belonging to the Dorylinae subfamily, often mistaken for army ants due to their predatory nature and foraging style. These ants are known for their short, thick scapes with a well-formed angle, which helps distinguish them from similar species. The queens of this species are considered subdichthadiiform, meaning they are wingless but possess larger eyes and ocelli compared to workers, and their gaster is significantly enlarged. Workers are typically medium-sized, often brown or yellowish, and lack the distinctive sculpturing seen in some related species. They are rarely observed due to their underground habits, making them a unique and challenging species for antkeepers.
- Difficulty: Hard
- Origin & Habitat: New World (Southern United States to Uruguay, Paraguay, and northern Argentina) in Deeply subterranean, found in soil, under stones, and in rotting wood, often in association with termite nests..
- Colony Type: Monogyne (single queen), claustral (based on typical doryline queen behavior, though specific details for a. laticornis are scarce) founding.
- Size & Growth:
- Queen: 11-11mm
- Worker: 1.01-1.31mm
- Colony: Small (hundreds), though specific colony size data is unknown and rarely collected for this genus.. Slow (due to their subterranean, predatory nature and specialized diet, often seen in less frequently collected species) growth.
- Antkeeping:
- Temperature: Specific temperature requirements are not well-documented, but given their New World distribution, a range of 22-28°C would likely be suitable, mimicking subtropical to tropical conditions..
- Humidity: High humidity is crucial, as they are a subterranean species that likely thrives in moist soil environments. Aim for 70-90% humidity within the nest..
- Diapause: Not required. Not specified at Not specified.
- Nesting: Deeply subterranean nests are preferred. For captivity, a deep naturalistic setup such as a Ytong nest or a setup with substantial soil substrate would be ideal, allowing for their tunneling behavior..
- Behavior: Medium (primarily towards prey, likely defensive if disturbed) aggressiveness.
- Common Issues: Difficulty in replicating natural subterranean environment, Specialized diet requirements (termites), Lack of knowledge on specific care parameters (temperature, humidity), Colony stalling due to inadequate conditions or food, Stress from light and vibrations.
Keeping Acanthostichus laticornis presents a significant challenge for even experienced antkeepers due to their highly specialized subterranean lifestyle and predatory diet. These ants are rarely encountered in the wild, which means much of their specific ecological and behavioral information is still unknown. Replicating their natural underground environment with adequate tunneling space and stable conditions is paramount for their survival in a formicarium. This is not a species recommended for beginners in antkeeping.
Their primary diet consists of termites, and possibly other ants, which poses a unique feeding challenge in captivity. Unlike many common ant species that readily accept various insect parts or sugar solutions, providing a consistent and suitable supply of live termites will be crucial for the health and growth of an Acanthostichus laticornis colony. Research into sustainable termite culturing methods or alternative food sources will be necessary for any keeper considering this species.
Acanthostichus laticornis queens are unique in that they are subdichthadiiform, meaning they are wingless but morphologically distinct from workers with an enlarged gaster. This type of queen morphology is not as commonly seen as fully winged queens or ergatoid queens. Observing the specific behaviors and reproductive cycles of such queens in a captive environment would be incredibly valuable, though it requires meticulous care and observation.
Due to their subterranean nature, these ants are sensitive to light and vibrations. When setting up their habitat, consider placing them in an area with minimal disturbances. Using a deep naturalistic setup with an opaque cover that can be removed for observation might help reduce stress. Patience is key, as much of their activity will occur out of sight within their tunnels.
Frequently Asked Questions
Are Acanthostichus laticornis good for beginner antkeepers?
Absolutely not! Acanthostichus laticornis are incredibly challenging to keep, even for seasoned ant enthusiasts. Their specialized subterranean lifestyle and dietary needs make them unsuitable for anyone just starting out in the hobby.
What do Acanthostichus laticornis eat?
These fascinating ants are primarily predators of termites, and potentially other ants, in their natural habitat. In captivity, providing a consistent supply of live termites is crucial. This is one of the biggest hurdles for keeping them successfully.
How big do Acanthostichus laticornis colonies get?
Specific colony size data for Acanthostichus laticornis is quite scarce, as they are rarely collected in the wild due to their deep subterranean habits. However, other species in the genus are thought to have colonies of hundreds of individuals, suggesting a 'Small' colony size estimate.
What kind of nest do Acanthostichus laticornis need?
Since they are deeply subterranean ants, they require a specialized nest setup that mimics their natural underground environment. A deep Ytong nest or a formicarium with a substantial amount of appropriate soil substrate would be necessary to allow for their tunneling behavior and to maintain high humidity.
Do Acanthostichus laticornis have different worker castes?
Acanthostichus laticornis workers are generally considered monomorphic, meaning they don't have distinct size-based castes like 'major' or 'minor' workers. However, their morphology is quite unique with distinctive head features.
Are Acanthostichus laticornis queens winged?
No, the queens of Acanthostichus laticornis are 'subdichthadiiform'. This means they are wingless but are visibly different from workers, typically much larger with an enlarged gaster, and possess small eyes and ocelli.
Do Acanthostichus laticornis sting?
Yes, like many doryline ants, Acanthostichus laticornis are capable of stinging. While their aggression is primarily directed towards prey, it's wise to handle them with extreme care to avoid any defensive responses.
Is diapause required for Acanthostichus laticornis?
Based on their natural distribution in tropical and subtropical regions of the New World, it is highly unlikely that Acanthostichus laticornis requires a diapause period. They are adapted to year-round activity.
How do Acanthostichus laticornis forage?
Acanthostichus laticornis are known to forage in columns, similar to true army ants, but on a smaller scale. They are primarily subterranean foragers, often seeking out termite nests underground.
Why are Acanthostichus laticornis so rarely seen?
Their extremely secretive, deeply subterranean lifestyle makes them very difficult to find and study in the wild. They spend almost their entire lives underground, only rarely coming to the surface, which contributes to their rarity in collections and observations.
Can I keep multiple queens of Acanthostichus laticornis together (pleometrosis)?
Acanthostichus laticornis colonies are considered monogyne, meaning they typically have only one queen. Attempting pleometrosis (keeping multiple queens together) is not advised and would likely result in conflict or the demise of the additional queens.
