Top 10 Most Poisonous Spiders in the World

There are many species of spiders some residing underground, on plants, on rocks and even in our homes. Spiders produce venom, which may cause untold suffering the person bitten. With sufficient venom dose, some spider bites can be lethal. It is therefore important to know the species of spiders that are very deadly because you can reside with them in your house or encounter them at your home garden putting you and your family at risk. Here is a carefully drafted list of the top 10 most poisonous spider in the world.

10. Yellow Sac Spider


As the name sounds, this spider has in its anatomy a bright yellow sac. Of all the poisonous spiders in our list of top 10 most poisonous spider in the world, this is the least venomous. These spiders make drag-line webs that are less dense and can easily be removed by vacuuming or swept by a broom. Luckily, this spider species does not like human presence and so will rarely come close enough to bite unless provoked. The importance of Yellow Sac Spider arises from the fact that its bite is associated with Methicillin-resistant Staphylococcus aureus (MRSA).

9. Chinese Bird Spiders


Native to the People’s Republic of China and Vietnam, this tarantula deserves mentioning is our list of the world’s most venomous spiders. They are known as cave tigers because they rule the ground in caves waiting to pounce of any potential prey that comes way. Humans can be bitten when they come close to the habitat of Chinese bird spider as may occur when cultivating or prepared grounds for planting. Its venom is powerful and can cause paralysis of the muscles surrounding the bite sites. It is lethal in small doses if administered on small animals.

8. The Fringed Ornamental Tarantula


This tropical spider species is another highly venomous arachnid the world has to offer. Fringed Ornamental Tarantula is found mostly in tropics and its bite has been associated with coma, not to mention severe pain and risk of infection of the bite wound. Not much has been deciphered concerning the venomosity but experts agree that fringed ornamental tarantula is potentially deadly and must be avoided at all costs.

7. The Wolf Spider


Several species of wolf spider are found in Europe and the Americas. The wolf spider is typically hairy, gray or brown in color with distinct strip-like markings on its back. The most fascinating feature of this spider is the arrangement of it eyes. The bottom row of its face has four rows of small eyes, two large eyes in the middle row and two medium sized eyes on the top. These spiders do not make webs. Instead, they hunt in groups. Although they are poisonous, their venom are not lethal. They only attack when provoked.

6. Mouse Spider


These spiders are native to Australia. The male mouse spiders have black body with redhead and jaws while the female is black all through. This spider is considered very poisonous but rarely causes wet bites (those injecting venom). However, if the mouse spider injects its venom in a bite, the outcome is potentially lethal to humans unless there is an emergency medical assistance.

5. Chilean and Brown Recluse Spiders


These two species share majority of characteristics including habitat and the potency of their venom. They are some of the most dangerous spiders in the word. However, thank heavens for the fact that they recluse meaning they like hide. Furthermore, they have very small fangs that are not capable of penetrating the clothing to reach your skin. If bitten, the venom causes immediate inflammation and necrosis of the surrounding tissues. This may turn gangrenous if nothing is done to reverse the effects of the venom.

4. Black Widow Spider


One of the most common and strangest spiders in the world is black widow spider. It is known to be one of the most poisonous spiders in the world. Even more interesting is the fact that it eats its partner after sex. The bite of the black widow spider causes a condition referred to as Lactrodectism characterized by muscle spasms and at times temporary muscle or brain paralysis. Without anti-venom, a bite by black widow spider is a death sentence.

3. Sydney Funnel-Web Spider


Sydney Funnel-Web is one of the deadliest spider species ever known to man. These spiders are very daring and are unlikely to give up a fight when provoked. Their bites are wet meaning that they will more likely deliver venom with each bite. They also have the tendency to strike multiple times injecting high volume of their venom in an attack. Their venom has a compound known as atracotoxin, which is deadly to all primates including humans.

2. Six-Eyed Sand Spider


This cousin of the recluses is found in parts of Africa and South Asia and the potency of its venom is several times that of the brown recluse. The good news is that this highly venomous spider in the world lives in areas far from humans. The spider causes localized necrosis and disseminated intravascular coagulation (DIC) – a disorder characterized by development of clots throughout the body, bleeding from all orifices of the body and death.

1. Brazilian Wondering Spider


The Brazilian wondering spider is, without a doubt, the most poisonous spider in the world (Guinness World Records 2010). It has earned this reputation because of the potency of its venom but the natures of toxicities it causes. The venom of this spider is a neurotoxin, which affects the nervous system leading to breathing difficulties, asphyxia and death. The toxin also causes constant painful erection, which can last for hours to days (a condition referred to as priapism). If not treated, priapism could lead to impotence.

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