Poisonous Spiders of the World

When poisonous spiders attack, these freaks of nature inject lethal venom into your bloodstream. Black widows, brown recluses, and redback spiders alike infest your house and spread into your bed and other dark places where they wait to bite and poison you with their toxin.

6: The Brown Recluse

The Brown Recluse is one of the few significantly poisonous spiders n the U.S. They primarily inhabit the Southern and Southeastern parts of the United States. As their name suggests, they prefer keeping to themselves despite being extremely poisonous. About half of all brown recluse bites result in harmful symptoms. When their fangs manage to pierce through your skin, the results can be very dangerous. Typical symptoms include nausea, vomiting, intense muscle and joint pain, skin rashes and high fevers. The skin that has been bit will oftentimes either die or become infected in a process known as necrosis. Their bites can also cause loxoscelism; a condition in which the damaged tissue becomes gangrenous and begins sloughing away slowly due to the gangrene. Additionally, once the venom makes its way into your bloodstream, you may experience blood clotting, organ failure leading to a coma, and ultimately, death. Although most healthy adults are likely to survive a brown recluse bite, children, the elderly, and those with weak immune systems are at greatest risk of dying or suffering from the severe symptoms. The bites themselves tend to be painless, meaning they can often take between two to eight hours before any harmful effects begin appearing. Fortunately, antivenom and modern medicine have proven to be effective treatment methods. Experts suggest, however, that once a person is bit, an attempt must be made to capture the poisonous spider and take it with when seeking medical help as it is fairly common for bites to be misdiagnosed. Chemical burns, various skin infections, and even herpes and syphilis have often been mistaken for brown recluse bites. In fact, it is estimated that close to 80% of all reported bites are actually misdiagnosed.

5: The Yellow Sac Spider

The Yellow Sac Spider refers to a range of spider species that are native to many parts of the world, including Japan, Europe, Australia, Africa, and India. Like the brown recluse, the yellow sac spider’s bite is highly venomous and can cause necrosis of the skin. In some instances, their bites have also been known to cause MRSA infections, which can be deadly if not treated appropriately. Also known as staph infections or Methicillin-resistant Staphylococcus aureus, MRSA is a bacteria that causes difficult-to-treat infections in humans. Symptoms include boils, impetigo, and in more severe cases, pneumonia and death. Yellow Sac Spiders are well known for being attracted to the smell of gasoline. They also have an inexplicable proclivity of weaving webs inside of Mazda vehicles. This is problematic as it can lead to fuel blockage and fuel pressure buildup, which can ultimately start an engine fire. As a result, Mazda recalled some of their Mazda 6 models in order to place software that notifies drivers of any yellow sac spider-related problems in the engines.

4: The Redback Spider

These poisonous spiders make their home in Australia. They prey on insects and other spiders, injecting them with their venom in order to kill them. They then wrap the insects up in their silky webs and suck out their insides. They’ve even been known to hunt down and kill larger prey, like lizards. Redback spiders also present a serious threat to humans when they interact. In fact, they are the cause of the majority of serious bites from poisonous spiders in Australia. One who is bit by a Redback spider will likely suffer from an illness known as Latrodectism. This is a disease that presents symptoms such as stomach cramps, loss of coordination, vomiting, muscle pain, convulsions, and sweating. Because tey prefer habitats close to humans, they bite humans far more often than any other spider in Australia. As many as 10,000 people are bit each year in Australia, 250 of which require immediate treatment. They often occupy dark holes, or clothing items, such as gloves and helmets. Therefore, bites often occur when people put on their gloves, hats, and other similar clothing. Bites to the neck and ear area as well as the hands and fingers have increased over the years as the use of safety equipment is nowadays more commonplace. Before indoor plumbing was widely used, it was fairly common for Redback spiders to bite people’s genitalia in old, dark outhouses.

3: The Funnel Web Spider

Funnel web spiders reside in Australia with bites that have proven to be very lethal towards humans. Their particularly powerful fangs are capable of tearing through fingernails and even shoes. Of the 35 species that make up the Australian funnel web subfamily, six of them are harmful towards humans. Due to the size of their fangs, these spiders administer a bite that is very painful. Bleeding will often occur, and if envenomed, the victim will experience symptoms such as sweating, mouth tingles, goosebumps, increased heart rate and blood pressure, watery eyes, salivation, confusion, muscle spasms, and metabolic acidosis. In extreme instances, unconsciousness will follow while fatalities have been the result of elevated intracranial pressure. The funnel web spider’s venom and subsequent symptoms spread very rapidly throughout the body. Therefore, it’s imperative that those who are bit seek medical treatment immediately. Wrapping the wounded area in a bandage and applying pressure to the bite is highly advised until the proper antivenom can be administered. Failure to do so can lead to death in as little as 15 minutes to 2 hours.

2: Mouse Spiders

Mouse spiders get their name from their ability to dig deep burrows, much like mice do. They’re indigenous to Australia and although their venom has deadly potential, attacks on humans ARE rare. Mouse spiders emit toxins similar to that of the funnel web spider. Victims therefore experience many of the same symptoms as funnel web spider bite victims. But with this comes the fact that the same antivenom that’s been effective in treating funnel web spider bites have proven to work just as effectively on mouse spider bites as well.

1: The Brazilian Wandering Spider

Also known as the Banana Spider, the Brazilian Wandering Spider is indigenous to Brazil and is found rampant among the country’s abundance of banana trees. They hold the distinction of being the world’s most poisonous spiders. The name “wandering” is indicative of the banana spider’s behavior. These poisonous spiders often wander into dark areas such as boots, boxes, clothes, and log piles where they will bite people if they’re unintentionally disturbed. They’ve also been known to be accidentally packed into sacks of bananas and shipped to different countries abroad, where they await to attack their unwary victims. Those who are bit by a Brazilian wandering spider are likely to suffer from symptoms such as intense pain leading to eventual death if left untreated. A single spider once killed two children in Sao Paulo, Brazil. In another case, a man was bit when one of these poisonous spiders was lurking secretively in a crate of bananas. Although he suffered from severe pain and spent nearly a week in recovery, he DID manage to survive the encounter thanks to professional medical treatment and swift administration of the proper antivenom.


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