bullet ant

bullet ant, (Paraponera clavata), large predatory neotropical ant known for its extremely painful sting. The bullet ant is found in the humid lowland rainforests of Central and South America, ranging from El Salvador and Honduras to Peru, Bolivia, and Brazil. The bullet ant’s sting is said to feel like a gunshot—hence the insect’s common name—and it is considered to be the most painful of all insect stings. In Venezuela the bullet ant is known as the “24-hour ant,” in reference to the length of time a person may feel pain from a sting.

The bullet ant is the only living species in its subfamily and genus. It was thought to be the only member of its genus until the discovery in 1994 of the extinct Paraponera dieteri, which lived from 45 million to 15 million years ago. The Texas bullet ant (Neoponera villosa) is an unrelated species native to Texas and Mexico; it also has a painful sting.

Natural history

The bullet ant is reddish brown and is approximately 1.8 cm–2.5 cm (0.7–1 inch) in length. Queens are only slightly larger than workers and have wings until they mate. The bullet ant has large mandibles and somewhat resembles a wingless wasp.

The ants are social insects, and they typically build their large nests in soil at the bases of trees or lianas that provide access to the forest canopy. Many mature colonies contain several hundred ants, but some may contain up to several thousand individuals, nearly all of whom are female workers. Worker ants perform different tasks according to their size. Smaller ants stay in the nest to tend the larvae, while larger ants forage and guard the nest. Bullet ants use their sting both defensively, against attackers, and offensively, when hunting.

Worker ants hunt and scavenge in the understory and in the canopy of the trees above the nest for live spiders, frogs, and insects, including grasshoppers, beetles, and katydids, or their carcasses. They also collect water and forage for nectar from flowers and extrafloral nectaries. They forage mainly at dusk and at night, and the collected food and water is brought to the larvae and mature ants in the nest. Pheromone trails show other workers where to find food.

Bullet ant workers defend their nest entrances against bullet ants from other colonies as well as against other predators. They will fight vigorously to defend their colony, making stridulating sounds from their abdomens and stinging intruders. They may even climb trees and drop onto attackers from above. Clashes between bullet ant colonies often leave many ants wounded. Injured ants emit an odor that attracts the phorid fly Apocephalus paraponerae, a parasite that feeds on and lays eggs in injured bullet ants.

Sting

The sting of the bullet ant is rated 4+ on the Schmidt sting pain index, developed by American chemist and entomologist Justin O. Schmidt to categorize the stings of ants, bees, and wasps. Schmidt, who used himself as a test subject for his index, described the pain of a bullet ant sting as “pure, intense, brilliant pain. Like walking over flaming charcoal with a 3-inch nail in your heel.” The burning, throbbing pain, coming in waves, is caused by poneratoxin, a paralyzing neurotoxic peptide found in the ant’s venom. Scientists are investigating potential medical applications of this bioactive peptide, including its potential use in analgesic drugs.

The bullet ant’s venom paralyzes and kills insects and other small organisms. In humans, the venom causes temporary paralysis of the affected body part, extreme pain, and uncontrollable trembling. Other symptoms include lymphadenopathy (swelling of the lymph nodes), edema, and tachycardia. If a person is stung many times, the results can be lethal.

The sting of the bullet ant is famously used in the manhood initiation rites of the Sateré-Mawé people of Brazil. For 5–10 minutes at a time, a boy must wear gloves into which bullet ants have been woven. After this ordeal his hands and parts of his arms become temporarily paralyzed, and he may tremble uncontrollably for several days.