Few months back I wrote an article about 10 Most Venomous snakes. So now I decided why shouldn’t I broaden up this category? And ended up writing this post about Most Venomous Spiders in World.
As was in the case of that previous list, almost half of the entries in this list are found in Australia. Although Most Spiders aren’t Venomous but there are some of its species, that their venom is even more deadly than a snake’s venom. So here we begin:
List of 10 Most Venomous Spiders:
10. Wolf Spider:
Our first entry, Wolf spiders belong to the Lycosidae family of spiders. They usually live and hunt alone. They are robust and hunt with agility. Their habitat includes wet coastal forests, alpine meadows, gardens and shrub lands. They have no less than eight eyes, arranged in three rows. They possess an excellent eyesight and an acute sense of touch.
Wolf spider bites if provoked. Symptoms of bite include itching, swelling and mild pain. Australian wolf spiders are even associated with necrotic wounds.
9. Brown Widow spider:
This spider is the ‘cousin’ of the more famous Black Widow spider (which will be covered later in this list). Its binomial name is Latrodectus Geometricus. It has been originated from South America, but now can be found in different areas of the world such as Tanzania, Japan, Afghanistan, Australia and UAE. Brown widow is usually lighter in color than Black widow spider.
Unlike Black widow, it has a black-and-white pattern on its abdomen. Its venom is much less harmful than the Black widow spider. Its bites are also minor when compared to Black widow spider’s bite.
8. Sydney Funnel-Web spider:
This spider is usually found within a 100 km radius of Sydney, Australia. It belongs to the Australian Funnel-Web spider group. Its binomial name is Atrax Robustus. Sydney funnel-web are mostly terrestrial spiders, they usually favor habitats with moist sand and clay.
If threatened or provoked, this spider raise its legs and show its fangs. In biting, funnel-web spider holds its prey with a tight grip and strikes more than once. Its venom contains a compound known as Atracotoxin, which makes it deadly toxic. If left untreated, its bite can even kill a man (a small child is reportedly killed within 15 minutes of its bite).
7. Brown Recluse spider:
The Brown Recluse spider or Fiddleback spider, is another spider-with-venomous-bite in our list. Its binomial name is Loxosceles Reclusa. It belongs to Sicariidae group. Its average length is 6-20 mm, but it can be larger. It is usually found in Southern Iowa, Illinois, Georgia and Texas states of US.
Brown Recluse Spider has very shy-nature and often lives in dark and secluded places. Effect of its bite varies due to the varied amount of venom it releases. A small white spot appears on the skin, soon after an intense strike. Tissues may also become hard.
6. Northern Tree Funnel-Web spider:
It is another spider in our list that belongs to the funnel-web spider group. This group bears its name due to a fact that these spiders resides deep in their own funnel. Its binomial name Hadronyche Formidabilis. It is also indigenous to Australia, usually found in Queensland and NSW (New South Wales). It usually lives in rotting logs, hollow branches of trees, particularly Tallow-wood trees.
Like most spiders, it is nocturnal and very fast runner. Because it lives in a remotely mountain area, its encounter with humans is rarely seen. But again, it is a very dangerous spider.
5. Redback spider:
The Redback spider is a very dangerous spider, indigenous to Australia. It belongs to Latrodectus group of spiders. Its binomial name is Latrodectus Hasselti. Male spider average length is 3-4 mm but Female Redback can be as long as 10 mm. It is one of the few species of spider that are seriously dangerous for humans.
Redback Spider usually preys small insects but can captures some large animals like, small lizard, mouse and Trapdoor spider. Average female Redback have 0.8-0.10 mg of venom, 10-20% of it, is enough to kill a mice. Symptoms of its bite are heavy sweating and radial pain.
4. Six-Eyed Sand spider:
It is a medium-sized venomous spider that is native to deserts and other parts of Southern Africa. Its binomial name is Sicarius Hahni. Like Chilean Recluse Spider (which we will cover later in this list), it is a member of Sicariidae family of spiders. The Recluses (another spider family) are its nearest-cousins.
It bears its name, due to a fact that it buries itself in sand and strikes its prey from there. Its venom is particularly contains highly hemolytic/necrotoxic substance, which causes blood vessels leakage and thinning of blood and destruction of blood. No anti-venom of this, exists till now.
3. Chilean Recluse spider:
Our first entry in top three, the Chilean Recluse spider is a venomous spider of sicariidae group. It is known as aranha-marrom (“brown spider” in Portuguese). As its name suggests, it is common in Chile, but can be found throughout South America. Its binomial name is Loxosceles Laeta. Many consider it, the most dangerous recluse spider.
Its venom has more amount of toxic substance, than any other Recluse spider. Its bites can cause necrotising ulcer that destroys soft tissues. Wound could grow as large as 10 inches. Its venom can also cause renal failure. Good news is, that it doesn’t attacks unless pressed against human skin. However, in case of bite, Ice pack can act as a first aid.
2. Black Widow Spider:
Black Widow spiders belongs to Theridiidae genus of spiders, which are commonly known as Widow Spiders. It is usually dark-colored and can be identified by hourglass-like marking in abdomen. Its binomial name is Latrodectus Mactans. This spider usually eats small insects who get caught up in their web. Black widows are considered the most dangerous spider species of North America.
Their venom is considered 15 times more dangerous than the Rattlesnake’s. But even then, black widows bite humans, only if disturbed. Symptoms of bite include severe pain within minutes of strike, nausea, profuse sweating, hypertension and paralysis of the diaphragm (which makes breathing difficult).
1. Brazilian Wandering spider:
Topping our list, Brazilian Wandering spider is widely regarded as Most Venomous Spider, ever recorded. It is also known as Banana spider and the Armed spider. It belongs to the Phoneutria (Greek word for “murderess”) genus of spiders. Unlike its name suggests, it is found all over South America, from Amazon and Peru to Costa Rica and Panama. They are called wandering spider because, instead of maintaining the web, these spiders wander the jungle in night.
In 2010, Guinness World Records recognized it as the most venomous spider. Its venom contains PhTx3, a neurotoxin which causes loss of muscles control and difficulty in breathing. Along this, its venom can also cause intense pain and inflammation. On a rather funny side, it can also cause Priapism (a medical condition in which penis remains erected for many hours), which can lead to impotence (now that is not so funny). One good news is that its anti-venom is available.
So here I shared with you, a list to Top 10 Most Venomous Spiders on Earth. Most of these spiders don’t live in crowded areas. So a little piece of advice from my part is that you should avoid this creature, if you have an encounter (don’t act like a Nat Geo expert!).
I hope you’ve enjoyed reading this post. You can leave a comment if you wanna share any of your bad experiences (we hope you don’t have any) with any of these dangerous spiders.