Gauromyrmex acanthinus - "Flattened Forest Ant"
Gauromyrmex acanthinus is a fascinating ant species known for its remarkably flattened appearance, which helps it to move and nest under loose bark and within tree cavities. These ants are generally yellowish to yellow-brown in color, with dense erect hairs covering their bodies. Workers exhibit a weak size dimorphism, meaning there can be slightly larger and smaller workers within a colony, though the size variation is continuous rather than distinctly separate castes. Their mandibles are triangular with six teeth, and their pronotal shoulders are notably toothed, making them quite distinctive. While generally timid, observations suggest they can be quick-paced when needed.
- Difficulty: Medium
- Origin & Habitat: Southeast Asia (China, India, Singapore, Thailand, Vietnam, Taiwan) in Arboreal, nesting under loose bark of living trees, in large dead logs, or fallen rotting branches, primarily within primary or old secondary forests..
- Colony Type: Monogyne (single queen) or possibly polydomous (multiple nests linked together) based on observations in the wild., claustral (based on typical myrmicinae founding, though specific details for this species are limited, they are not noted as parasitic) founding.
- Size & Growth:
- Queen: Not specified
- Worker: 2.4-2.7mm
- Colony: Small (hundreds), exact colony size is unknown but anecdotal reports suggest small nests.. Slow (estimated based on limited information about colony size and wild observations) growth.
- Antkeeping:
- Temperature: Aim for temperatures between 24-28°C (75-82°F) to mimic their natural tropical and subtropical habitat. Consistent warmth is likely beneficial for brood development..
- Humidity: Maintain high humidity levels, around 70-80%, given their preference for moist forest environments and nesting in rotting wood and under bark. Proper ventilation is still important to prevent mold..
- Diapause: Not required. Not specified at Not specified.
- Nesting: Given their natural arboreal and flattened nesting habits, vertical setups like naturalistic cork bark nests, bamboo nests, or even acrylic nests with very thin chambers would be ideal. They have been observed nesting under loose bark and in tree cavities..
- Behavior: Low (timid, primarily towards handlers, unknown towards other ants) aggressiveness.
- Common Issues: Humidity fluctuations, Finding suitable nesting material/setup, Stalling due to improper humidity or temperature, Mold in nest (due to high humidity requirements, proper ventilation is key).
One of the most captivating aspects of keeping Gauromyrmex acanthinus is their unique morphology. Their incredibly flattened bodies aren't just for show; this adaptation allows them to squeeze into tight spaces, like under loose tree bark and within narrow crevices. When setting up their formicarium, you'll want to ensure there are plenty of very thin, tight chambers or a similar arboreal setup that mimics these natural conditions. Observing how they navigate these constrained environments can be a truly rewarding experience for any ant keeper.
These ants are largely arboreal, meaning they prefer to live in trees. In the wild, they've been found nesting under loose bark of large living trees, in dead logs, and within fallen rotting branches. This strong preference suggests that a traditional soil-based setup might not be the most suitable. Instead, consider providing cork bark tubes, layered acrylic nests with very shallow galleries, or even a naturalistic terrarium with substantial pieces of rotting hardwood or cork where they can establish their colony.
While specific dietary information for Gauromyrmex acanthinus is limited in scientific literature, like most ant species, they will likely thrive on a diverse diet. This should include a regular supply of insect protein, such as small crickets, roaches, or mealworms, which can be offered pre-killed or live depending on the colony's size and aggressiveness. Additionally, a steady source of sugary liquids like sugar water, honey water, or fruit jelly will provide essential carbohydrates for energy. Always ensure feeders are accessible in their outworld.
Gauromyrmex acanthinus workers have been noted to exhibit a 'weak dimorphism,' meaning there's a continuous range of worker sizes rather than distinct minor and major castes. This is a subtle yet interesting characteristic to observe as your colony grows. Pay attention to the size variation among your workers, as it can indicate the health and maturity of the colony. While not as dramatic as some highly polymorphic species, it still adds to the unique charm of these ants.
Due to their natural habitat being tropical and subtropical regions, maintaining consistent warmth and higher humidity levels will be crucial for the well-being of a Gauromyrmex acanthinus colony. Fluctuations in temperature or drops in humidity can cause stress and potentially lead to colony decline. Using heating mats or cables connected to a thermostat, along with regular misting or a hydration system in the nest, will help create a stable environment that closely replicates their native conditions.
