There are about 34,000 different known species of spiders in the world, but only a dozen of these are harmful to humans. Four of the deadliest spiders in the world are the brown recluse, the black widow, the Brazilian wandering spider, and the Sydney funnel-web spider. These arachnids should undoubtedly be avoided.
Brown Recluse Spider (Loxosceles reclusa)
The brown recluse is native to the United States. It prefers areas that are dark and undisturbed. They can be found both indoors and outside. Their identifiable marking is a dark violin shape on top of their cephalothorax. The brown recluse is not an aggressive spider, but will inject potentially deadly hemotoxic venom into its victims if it is pressed against the skin. The toxin causes necrosis in most people. In children, the elderly, and those with lowered immune systems, the venom will cause systemic illness.
Black Widow Spider (Latrodectus mactans)
The black widow can be found in the southeastern United States. Their characteristic marking is a red hourglass shape on their black abdomen. It is not an aggressive spider. The black widow injects a neurotoxin into its victims. The venom can interfere with nerve impulses to muscle tissue. In children and the elderly, the venom can be fatal.
Brazilian Wandering Spider (Phoneutria fera)
The Brazilian wandering spider has a few names such as banana spider and armed spider. They can be found in the tropical and subtropical regions of Central and South America. These are highly aggressive spiders and are extremely dangerous. They wander around the forest floor and are commonly found in peoples’ homes. The venom contains a neurotoxin which can cause death by asphyxiation.
Sydney Funnel-Web Spider (Atrax robustus)
The Sydney funnel-web spider resides near Sydney, Australia. They can grow to 3 inches in length and have a dark, glossy body. They are extremely aggressive and are the most venomous of the funnel-web spiders. They will strike repeatedly, potentially causing death by injecting atracotoxin into their victims.
These four species of spiders are not all aggressive, but can cause painful bites and serious adverse reactions ranging from necrosis to death. Keep your eyes open because the best way to deal with these dangerous creatures is to avoid them. If you’re not careful, one bite from one of these arachnids could mean a trip to the nearest hospital.