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World's Most Deadliest Spiders

Updated on July 30, 2015

Spiders! The creature that scared me in my childhood, that six legged tiny monster-like creature was my nightmare. But anyhow I overcome this phobia and it was always my eager desire to share my childhood nightmare with you. It is estimated that 3.5 to 6.2 % world's population are suffering from arachnophobia i.e., fear from spiders. They can be seen anywhere from your house, garden to the forests and deserts. And there are approximately 35,000 Species of spiders, isn't it scary! And I have picked up some most dangerous spiders from around the world in my top 10 countdown.



Sac spiders are found in Australia, Canada and many places in between. They are usually 5 to 10 mm long and pale yellow or green in color. Venom of yellow sac is a cytotoxin, which break down cells and possibly causes necrosis. Bites are characterized by an initial stinging pain and then redness and swelling.



It is the largest spider in the world. Belongs to the tarantula family Theraphosidae. They are found in rain forest regions of northern South America. And found commonly found in marshy or swampy areas. These spiders can have a leg span of upto 28cm (11in) and weigh 170g.



Scientific name of Fringed Ornamental Tarantula is 'Poecilotheria regalis'. It is derived from Greek word 'poi kilos' means spotted and 'thereon' means wild beast, regails means Royal. It is one of the most popular tarantulas. The Spider is native to South-eastern India. The common name for this spider is 'Indian Ornament Tree Spider'. They have leg span of up to 18 cm (7 in). They live in holes of big trees and made funnel web there. Their diet includes various flying insects.



The Scientific name for this spider family is 'Sicarius' which means 'Murderer'. They hunt by burying themselves in the sand and waiting for their unsuspecting victims. They have got 8 legs, 6 eyes, named murderer and lives in the deserts of South Africa. What else is needed to be scared! But it isn't the biggest threat to humans, there have only ever been two suspected cases of bites to humans.



There are 11 species of mouse spider found around the world. And they are capable of surviving in any environment. They vary from 10 mm to 35 mm body length. Mouse Spider species are often mistaken for funnel-web spider. Both can be large and shiny black but have less-dangerous venom.
And 'Mouse Spider', as its name suggest doesn't mean that they eat mouse but it was given for the large, supposedly 'mouse-like' burrows built by them.



The Red Back Spider is found in Australia. It is a member of Widow spiders. Females is grown up to 10 mm (0.5 in) in body length, while the male is smaller and grown only 3-4 mm (0.12-0.15 in) long. The adult female can be easily recognized by her spherical black body with a red strip on the upper side of her abdomen. They lives in warm places, commonly found near human residence. Their diet includes insects, spiders. Their venom is neurotoxic and can be seriously harmful to humans.



These spiders are among the most venomous in the world. As the name suggest they built funnel-shaped webs, which is use as burrows or to trap prey. These spiders are grown up to about 2.5 to 5 cm (1 to 2 inch), and are of typically black or brown color.

They usually eat insects, lizards or frogs. Unlike other group of spiders, the male Sydney funnel web is equipped with the most potent venom up to six times stronger than that of the females. The venom is a neurotoxin and contains a special chemical called Pobustoxin, which is very dangerous for humans. But fortunately their anti-venom have been found.



The Brown Recluse belongs to the 'Loxosceles' family of spiders. They are also referred to as violin spiders, because of having violin-shaped marking on the top of their head and thorax. They are usually between 6 mm to 20 mm (0.24 to 0.8 inch). While most spiders have eight eyes, recluse spiders have six-eyes which distinguished them from other spiders.

They bears a potentially deadly hemotoxic venom. In the severe cases the area around the bite begins to die and a deep open shore is formed. In the very worse cases limbs have needed to be cut off. And don't try to spray them with bug-killer, because they are immune to some insecticides and make them more toxic and angry.



Black Widow is one of the most popular spiders on the planet. Their venom is reported to be 15 times stronger than the venom of a rattle snake . They are generally found in North America. Female Black Widows are about 0.5 to 1.5 inch long, males are about half of the size of females. Female kill and eat a male after mating. Like the other spiders black widow prays on insects. Due to the presence of latrotoxin in their venom, their bites are potentially dangerous and may results in systemic effects.



Brazilian Wandering Spider is officially the world's most venomous spider. It is capable of injecting a powerful neurotoxin which is nearly 20 times more deadly than that of black widow spider.

Scientific name of this spider is Phoneutric which means "murderess". They can grow to have a leg span of 13 to 15cm (5 to 6 inch). The characteristics defensive posture with frontal legs held high is an good indicator to confirm the spider. Wandering spiders are so called because they wander in jungle floor at night. Its venom contains a potent neurotoxin, PhTx3. This neurotoxin can cause loss of muscle control and breathing problem, resulting in paralysis. And Brazilian Wandering Spider is the World's Deadliest Spider.

Which among the spider scared you most?

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Thanks for giving time to my article, i hope it was useful for you. Please be free to give feedback and additional information.


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    • Fahad ansari12 profile imageAUTHOR

      fahad ansari 

      3 years ago from Greater Noida

      Thanks reumus. And sure i'll look at your hubs.

    • Reumus Archimid profile image


      3 years ago from India

      Please, if having any time then must take a look at my hubs.

    • Reumus Archimid profile image


      3 years ago from India

      Good work Fahad

      Keep it up!!!!!!


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