Polyrhachis dives - "False Weaver Ant"
Polyrhachis dives, often called the False Weaver Ant or Golden Weaver Ant, is a captivating ant species from Southeast Asia and parts of Australia. These ants are known for their unique nest-building behavior, where workers use silk produced by their larvae to bind together debris like leaves, twigs, and even soil to create intricate, ball-shaped nests. Their bodies typically display a blackish-gray color with striking metallic yellow or silvery bands on their gaster, giving them a distinct 'golden-tailed' appearance. Workers usually measure between 6-8mm, while the queens are noticeably larger, around 10-12mm. Polyrhachis dives are a highly active and often aggressive species when disturbed, known to spray formic acid as a defense mechanism.
- Difficulty: Easy
- Origin & Habitat: Southeast Asia, Northern Territory of Australia in Open woodlands, swampy coastal plains, bamboo groves, humid regions, mangroves, canopies, semi-urban areas like parks and gardens..
- Colony Type: Polygyne (multiple queens), semi-claustral founding.
- Size & Growth:
- Queen: 10-12mm
- Worker: 6-8mm
- Colony: Large (tens of thousands to hundreds of thousands in some supercolonies). Fast. From a small colony, they can reach hundreds, if not thousands, of workers quickly within a year under optimal conditions. growth.
- Antkeeping:
- Temperature: Optimal nest temperature is 25-28°C, with an acceptable range of 24-30°C. The outworld can be slightly cooler, around 22-30°C..
- Humidity: Nest humidity should ideally be 55-65%, while the outworld can range from 30-70%. They are quite adaptable and can manage with lower nest humidity if a consistent water source is available, as they will transport water themselves..
- Diapause: Not required. Not specified at Not specified.
- Nesting: This species has unique nesting requirements due to their weaving behavior. They thrive in setups that allow them to construct their nests, such as 'tubs and tubes' setups, Wakooshi weaver outworlds, or natural/semi-natural setups with plenty of materials like spiderwood, bamboo sticks, hemp fibers, leaves, twigs, and soil. Avoid overly large setups for small colonies, as this can hinder their development..
- Behavior: Medium (towards prey and threats, defensive towards handlers) aggressiveness.
- Common Issues: Escape artists due to climbing ability, Humidity fluctuations impacting weaving, Lack of suitable weaving material hindering nest construction, Overfeeding leading to waste buildup (though they are good at cleaning), Formic acid spray if agitated.
One of the most remarkable traits of Polyrhachis dives is their intricate nest construction. These 'false weaver ants' actively use their larvae as living 'glue guns'. The workers hold the larvae in their mandibles, inducing them to produce silk, which is then used to bind together various materials like leaves, twigs, and even soil particles to form robust, communal nests. This fascinating behavior is a highlight for many antkeepers and makes them incredibly engaging to observe. Providing them with ample building materials in their outworld, such as small branches or hemp fibers, will allow them to exhibit this natural instinct and create visually stunning formicaria.
Polyrhachis dives are a polygyne species, meaning their colonies can support multiple queens. This allows for incredibly rapid colony growth and the potential to reach impressive sizes, with some supercolonies numbering in the hundreds of thousands of workers. In captivity, it's possible to start with a single queen, but having multiple queens can accelerate development significantly. This polygynous nature also means that mature colonies can produce new queens and males within the nest, a phenomenon known as intranidal reproduction, making captive breeding more feasible.
Despite their generally easy care requirements, Polyrhachis dives are an active and defensive species. They don't sting, but they can spray formic acid from their gaster if threatened. While not harmful to humans if contact is avoided, it's a good reminder to handle them with care and wear eye protection. They are also known for their strong biting mandibles, though they typically cannot pierce human skin. Their energetic nature and quick movements make them a joy to watch, but also mean escape prevention is crucial.
Their diet is quite straightforward, consisting of both sugars and proteins. They are not particularly picky eaters and will readily accept a variety of feeder insects like crickets, mealworms, and fruit flies, along with sugary liquids such as honey water or ant nectar. Consistent feeding is vital for optimal growth due to their fast metabolism and high food requirements. Ensuring a clean water source is always available is also paramount for their hydration.
While generally hardy, Polyrhachis dives are a tropical species and do not require a diapause (hibernation) period. Maintaining stable temperatures year-round within their preferred range of 25-28°C is crucial for their continuous activity and development. Occasional slight temperature drops might lead to reduced egg-laying, but a full diapause is unnecessary and could be detrimental.
