Top 10 Most Poisonous Spiders in the World

At some point, most of us wish we could have the capabilities of Spiderman. If only there was a spider which could give humans the ability to ditch the traffic and practically fly across the city. Unfortunately, Spiderman is fictitious. What are not fictitious, however, are spiders that can bite and lead to disastrous consequences. So before you are off searching for spiders to give you super-human abilities, make sure you stay away from these 10 most poisonous spiders in the world.


10) Hobo Spider

The hobo spider (scientific name Tegenaria agrestis) are known as the ‘aggressive house spiders.’ They are typically 12 to 18 mm long, brown in colour and have hairy legs. They were common across Europe but went unnoticed, and sparked a lot of interest only when they were discovered in the Northern parts of America. It delivers fatal bites to test subjects in labs, but may not lead to death in humans. However, it is extremely common, therefore, more dangerous than spiders with similar fatality potential. Its bite can induce headaches and nausea, and the dead cells around the bitten area take some time to get replaced.

9) Sac Spider

Clubionidae, better known as the Sac Spider can deliver a bite which is not fatal but can be painful and take days to heal. The 5 to 10 mm in length, it may look docile in its natural habitats of tree barks and rocks, but is actually rather quick to attack. It is common in almost all continents of the world with vegetation, and is known to cause a number of bites each year. It also has 8 eyes, arranged in pairs of 4 on its head, and of course, a sac on its back which dominates its body and gives it the name.

8) Goliath Bird Eater Tarantula Spider

Goliath Bird Eater Tarantula Spider is one of the largest spiders in the world. It measures up to 28 cms. The females live for almost 20 years, whereas males die in 4 years after mating. They are capable of laying hundreds of eggs in one go. These huge spiders tend to live under rocks or in swampy, marshy areas throughout North and South America. They can be easily identified with their intimidating size and their dark, hairy bodies. Their appearance itself strikes fear in most humans, and their bite is painful and sometimes requires medical attention.

7) Wolf Spiders

The Wolf Spiders get their common name from their scientific family name, Lycosidae, which means wolf in Latin. There are about 175 types of wolf spiders in the world, most of which are common in North America and Europe. These spiders can be as small as 1 mm and grow as big as 35 mm when fully mature. They are usually grey or brown in colour and have 8 eyes, with four eyes in the bottom, two big eyes in the middle and two rather small eyes on the top. They are extremely agile but prefer being left alone. When irked, their bite can result in redness and irritation and may require some first aid.

6) Mouse Spider

One of Australia’s deadliest spiders is the Mouse Spider. It has movements that mimic that of a mouse but are much more aggressive and sensitive. There are 13 known species of these spiders, all of which are found only in Australia and New Zealand. They can be almost 3 cms in length, but when they attack humans based on their vibrations, it can be fatal. Humans (especially children) require immediate medical assistance and will be in need of anti-venom. Their venom is similar to the funnel-web spiders and is often the remedy for Mouse Spider’s bites as well.

5) Brown Recluse Spider

The Brown Recluse Spider is found in certain states of the USA and parts of Central America. They grow up to 20 mm long and can vary in colours between cream, brown and smoky grey. These spiders are typically shy and do not intentionally get in humans’ way. It usually bites when provoked. However, one bite from this spider can lead to severe pain, redness, and in extreme cases failure of kidney and coma. There are documented cases of some fatalities caused by this spider despite an anti-venom being available. To be safe, it is suggested that if anyone is bitten by a Brown Recluse Spider, they walk into the emergency room immediately.

4) Redback Spider

The Redback Spider belongs to the Black Window family, one of the most infamous spider family in the world. It is referenced in various books and movies as being one of the most vicious spiders in the world, with females eating the males right after they mate. Females can grow upto 10 mm and are identifiable with a bright red mark running across their backs. These spiders are typically found in Australia, and most bites occur during the summers. Some immediate effects of the bite include acute pain, nausea, muscle ache, headaches etc. In some extreme cases seizures, the failure of the human respiratory system and also, coma. Children and elderly are more prone to death as compared to healthier adults. However, research has now provided medical experts with anti-venom to counter these effects.

3) Funnel Web Spiders

The Funnel Web spiders were mentioned before on the list as being venomous. These spiders found in Australia and North America are notorious for their large fangs, which are capable of delivering a large dosage of venom in a single bite. These spiders can range between 1 cms to 5 cms and have a dark, glossy appearance. They are aggressive when they attack, striking their victim several times to ensure their own safety. The immediate effects of their bite include nausea, muscle spasms and dizziness. It has been known to kill adults as well as children, and some within minutes of a bite. Although anti-venom is available, it is sometimes a little too late to be delivered to the victims.

2) Six-Eyed Sand Spider

This particular spider is found in deserts of Africa and in certain parts of South-East Asia. At 15 mm long, it camouflages into the sandy environment and can be difficult to spot. However, people who have been bitten by the Six-Eyed Sand Spider have high chances of mortality. The venom results in blood clots throughout the body, which further leads to bleeding from the skin. The victim dies a slow, painful death. What makes the matter worse is that there is no anti-venom for this spider as off now.

1) Brazilian Wandering Spider

The most venomous spider in the world is also on of the largest in the world. The Brazilian Wandering Spider measures up to 17 cms and is found across the South American continent. They don’t make webs, but rather hide in dark areas and roam around during the night. They are extremely aggressive and would rather strike repeatedly even with a highly effective venom. Their venom is a neurotoxin, which disrupts breathing and leads to death within few minutes. At lower dosages, men can have a prolong erection followed by impotence. Deaths due to Brazilian Wandering Spider are well-documented and are hence one of the most feared spiders in the world.

The idea of having a spider bite you doesn’t seem that appealing now, does it? Don’t worry. Only a small fraction of spiders are venomous, and even lesser are fatal in nature. As long as you steer clear of these few spiders, you are free to keep looking for other friendlier spiders, which might just one day fulfil your wishes.

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