Paratrechina longicornis
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Description
Paratrechina longicornis - Superfast Clone Army
Paratrechina longicornis, globally known as the Black Crazy Ant (BCA), is a true sensation in the animal kingdom. This species combines a hypnotic, lightning-fast movement dynamic with one of the most extraordinary reproductive systems ever documented by modern science. If you are looking for ants whose outworld is constantly buzzing with life, and whose colony exhibits unmatched vigor and biological immortality, this taxon represents a pinnacle of evolutionary achievement in the invertebrate world.
In nature, these fascinating synanthropic ants have successfully colonized almost all tropical and subtropical zones across the globe. Their breathtaking speed, unique erratic foraging biomechanics along zigzag paths, and instant adaptability make them unrivaled explorers of the vivarium space. The following compendium provides a complete set of biological information and precise care guidelines to allow you to maintain this unique colony safely and rewardingfully.
| Trait | Description |
|---|---|
| Scientific name | Paratrechina longicornis (Latreille, 1802) |
| Common / trade name | Black Crazy Ant (BCA) |
| Distribution and origin | Pantropical species (origin: Indian subcontinent / tropical Africa) |
| Queen size | 4.5 - 5.5 mm |
| Worker size | 2.3 - 3 mm (monomorphic) |
| Male size | 2.5 - 3.5 mm |
| Coloration | Dark brown to jet black with a bluish-lead iridescent sheen |
| Colony structure | Functional polygyny (multiple queens), polydomy, unicoloniality |
| Nest founding | Claustral / budding / small split with workers |
| Mature colony size | In nature up to 10 000 workers per nest, forming billion-strong supercolonies, unlimited in captivity |
| Development time (Egg - Adult) | 22 - 37 days (approx. 3 - 5 weeks) |
| Hibernation / Diapause | None - non-hibernating ants (do not require a cold period, active year-round) |
| Nest temperature | 20°C - 26°C (68°F - 79°F) [optimally 24°C - 25°C (75°F - 77°F)] |
| Outworld temperature | 22°C - 32°C (72°F - 90°F) [optimally 26°C - 28°C (79°F - 82°F)] |
| Nest humidity | 55% - 70% (slight humidity gradient required) |
| Outworld humidity | 40% - 60% (well-ventilated space) |
| Diet and nutrition | Sugars (honey or sugar water), protein (small feeder insects, live feeder insects for ants only for large colonies) |
| Recommended nest type | 3D printed formicaria (available in our store), aerated concrete (Ytong), gypsum, test tube with a small outworld up to a few hundred workers |
| Care difficulty | Low - the only requirement is an escape-proof formicarium, available in our store |
Unique morphology and unprecedented locomotor system
Workers of Paratrechina longicornis are monomorphic, measuring 2.3 to 3 mm in length. Their slender, agile body is covered with a smooth cuticle ranging in color from dark brown to jet black, often shimmering with a cool, bluish-lead iridescent sheen. Distinctive, thick, pale macrochaetae setae are clearly visible on the surface of the integument.
The most distinctive diagnostic feature of this taxon is its extremely elongated appendages. The antennal scape is so long that it exceeds more than twice the distance from its base to the posterior margin of the head, and the antennae themselves consist of 12 segments without a distinct club. Combined with disproportionately long legs, this allows workers to achieve breathtaking speeds.
This species is completely stingless. Their organ of defense and predation is the acidopore - a terminal secretory apparatus located at the tip of the gaster surrounded by a corona of setae. In case of threat or hunting, workers accurately spray formic acid directly into micro-wounds inflicted by their nimble, five-toothed mandibles.
Evolutionary miracle of nature - Double cloning and barrier-free inbreeding
The greatest biological phenomenon distinguishing Paratrechina longicornis from the entire animal kingdom is its revolutionary reproductive system based on double cloning, discovered by the team of Dr. Morgan Pearcy. In typical hymenopterans, multi-generational inbreeding leads to inbreeding depression, triggered by homozygosity at complementary sex determination (CSD) loci, resulting in sterile diploid males and colony collapse.
Paratrechina longicornis completely bypasses these biological constraints. Within the nest, two genetically isolated streams operate:
- Young queens arise via thelytokous parthenogenesis - they are 100% genetic clones of their mother and do not inherit a single allele from the father.
- Males develop through the phenomenon of natural androgenesis - the fertilized egg eliminates the maternal nucleus, resulting in a male that is a 100% genetic clone of its father.
- Workers are produced through standard sexual fertilization, combining the genes of both parents as obligate, highly heterozygous first-generation (F1) hybrids.
Thanks to this extraordinary strategy, repeated inbreeding inside the formicarium causes zero genetic defects or inbreeding depression. The colony mates virgin queens directly inside the nest or in the outworld without requiring risky nuptial flights. New generations of fertile queens immediately begin oviposition, and the colony expands via budding. As a result, under proper conditions, the colony becomes virtually immortal and self-renewing.
Behavioral ecology, the Biosphere 2 case, and erratic foraging locomotion
The ecological prowess of this species is best exemplified by the famous experiment in the artificial ecosystem Biosphere 2 in Arizona. Accidentally introduced, Paratrechina longicornis dominated the entire 1.2-hectare enclosure within just three years, accounting for over 99.9% of all ants present. They outcompeted nearly all native invertebrates, establishing a mutualistic partnership with sap-feeding hemipterans (scale insects and mealybugs) whose honeydew provided boundless carbohydrates.
As a textbook invasive tramp ant, this species displays an absence of intraspecific aggression between different nests and extreme habitat opportunism. In the outworld, foragers do not march in slow, dense pheromone trails. Instead, one observes an energetic, erratic sprint along zigzag, individualized trajectories. Continuous scanning with their long antennae ensures that any food source is pinpointed within moments.
Environmental parameters and optimal formicarium
Because this species evolved in warm, humid tropical biomes, maintaining stable temperatures fosters rapid growth. The nest should be kept at 20°C - 26°C (68°F - 79°F) [optimally 24°C - 25°C (75°F - 77°F)], while the outworld area can be warmer, reaching 26°C - 28°C (79°F - 82°F), effectively stimulating workers to actively forage.
Up to several hundred workers, the ants are best kept in a test tube connected to a small outworld. For safely maintaining larger colonies, escape-proof 3D printed formicaria perform exceptionally well, as do aerated concrete (Ytong) and gypsum setups. The tiny stature of the workers demands seamless construction tolerances - any assembly gaps exceeding 0.3 mm must be eliminated.
Balanced ant colony diet and feeding guidelines
A well-balanced ant colony diet relies on two foundational nutritional pillars: easily digestible carbohydrates and varied protein:
- Carbohydrate fraction (energy for continuous activity): Supply carbohydrates in liquid form - sugar water or honey water are excellent choices. Serve liquids as numerous micro-droplets on non-absorbent surfaces or utilize dedicated 3D printed ant feeders that allow ants to grip the edges securely while feeding.
- Protein fraction (brood development and oogenesis): Protein is vital to stimulate oviposition in queens and fuel larval growth. Provide young colonies with pre-killed, soft feeder insects (e.g., Drosophila melanogaster fruit flies, pinhead crickets, cut mealworms, or red runner roaches). Once the colony numbers several hundred workers, offering live feeder insects for ants will trigger a coordinated and thrilling hunt in the outworld.
Rapid ant colony development means protein demand surges during peak growth, with the egg-to-adult ontogenetic cycle completing in just 3 to 5 weeks.
Protective barriers and safety measures
Given the remarkable agility and small size of the workers, outworld containment requires precision. The upper perimeter of the outworld walls or underside of the rim (if present) must be coated with a dry mechanical barrier of dry talcum powder, which reliably prevents workers from scaling the glass or acrylic.
Common husbandry mistakes and how to avoid them
- Offering an oversized nest initially: Too much nesting space in early stages leads ants to dump food waste in unused chambers. Keep colonies in a test tube connected to a small outworld until they reach several hundred workers before transitioning to a formicarium.
- Hypothermia / Chilling: As non-hibernating ants, their colony develops continuously year-round at stable temperatures. While they can endure dips to 18°C (64°F) without harm (it should not stay colder long-term), it is best to provide heating during winter, warming one corner of the nest thoroughly.
- Improper liquid feeding: Pouring large, deep pools of liquid syrup directly into the outworld risks drowning small workers. Always provide multiple small drops or use 3D printed feeders.
- Leaving structural gaps: All vinyl tubing connections to the nest must fit snugly with zero mechanical play.
Start keeping a living legend of myrmecology
Paratrechina longicornis is unequivocally one of the most fascinating and dynamic species available to ant keepers. Combining frantic hunting behaviors, a double-cloning strategy that circumvents inbreeding depression, and indefinite colony renewal, it is a centerpiece for any collection. If you seek captivating exotic ants for home rearing that guarantee non-stop action in the outworld, this taxon will exceed all expectations!
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