Top 10 poisonous spiders in the world

1.Brown Recluse

There are many candidates for the title of the world’s deadliest spider. One of the most important considerations in determining the deadliest, is who the spider is deadly to. Some spiders can efficiently poison even small mammals with their venom, and a few can make humans very ill as well. Typical listings for deadliest spider include the Brazilian Wandering Spider, which occasionally shows up in cluster of bananas in the US, the Funnel Web Spider, which lives in Australia, the Hobo Spider, which can be found in the US, and the Brown Recluse. 

This spider is a native of the United States. A seemingly innocuous spider, yet its bite can wreak all kinds of havoc on humans. Brown Recluse spiders like to hide away in dark places, such as boxes, under furniture and around books. Symptoms of having been bit by this spider include redness and swelling around the bite, as well as nausea, fever, vomiting and shivering. 

2.Black Widow

The Black Widow's scientific name is the Latrodectus hesperus. Although most are black, some Black Widow spiders are actually brown. Females feature a red hourglass shape on their abdomens. Black Widows like warmer regions and thrive in the desserts of the United States. Although the female black widow does inject poison when it bites, only one percent of bites result in death. 

3.Brazilian Wandering Spider

Also called the Banana Spider, this species is both aggressive and extremely venomous. Although called a Brazilian spider, there are a variety of species found in forests in countries such as Costa Rica, Argentina, Columbia, Ecuador, Venezuela, Peru, Bolivia, Brazil and Paraguay. The spider's venom contains a neorotoxin known as PhTx3. Although their venom is deadly, the spider or spiders would have inject enough venom to harm a human.

4.Funnel-Web Spiders

Funnel-Web spiders are found in Australia close to Sydney. The bites from these spiders are dangerous and can cause a number of frightening symptoms in as little as 10 or 15 minutes. Of greatest concern are symptoms such as difficulty breathing and coma. Lesser symptoms include chills, fever, vomiting, numbness of mouth and lips and drooping eyelids. If bitten by this spider, seek an antivenom.

5.Mouse Spiders

Even though the Black Widow may have a better known name, the Mouse Spider is actually quite venomous. Also, these spiders are in nearly every country and environment imaginable. The female is black and the male is dark brown or black with a red head area. The venom of the Mouse Spider is similar to the venom in a Funnel-Web spider. This spider is highly aggressive and will attack when it feels threatened. 

6.Red Back Spider

This spider is found in Australia. Its bite can be deadly, especially to the very young or the very old. The spider likes dry areas and is often found outdoors. Its appearance is similar to that of the black widow. It is found in both rural and urban areas. Most bites from the Red Back Spider occur in the summertime. Symptoms include pain, sweating, vomiting and weakness in the muscles.

7.Wolf Spider

These spiders are both brown and gray. Their venom might not be lethal, but like any spider bite infection can set in. If bitten by a Wolf Spider, or any spider, you should seek treatment from your doctor. Do not bind a bite wound, instead put ice on it until you can reach medical help. There around 125 different types of Wolf Spiders found in the USA and another 50 in Europe.

8.Goliath Birdeater Tarantula

One of the largest spiders around, just the site of this monster is enough to strike fear in the heart of any arachnophobe. Even though this giant is the size of a dinner plate, and does carry venom, it is far from deadly. Most of the time, some minor pain and swelling will occur at the site of the bite. The Goliath Birdeater can even devour a full grown mouse or small birds, thus the name.

9.Sac Spider

Even though Brown Recluse spiders are often blamed for spider bites, scientists suspect that many bites come from these Sac spiders. Sac spiders carry a venom that has cytotoxin and actually kills cells. Even though the bite can leave a nasty mark and irritation in the area, or the person might feel a bit ill, these bites are not deadly. These spiders are also known as ghost spiders.

10.Hobo Spider

These spiders look similar to a brown recluse, but have hairier legs. Although the spider's bite is not deadly, the venom can actually cause tissue to die at and around the bite site. The bites can take months to heal and leave permanent scars. One of the easiest to recognize symptoms of this spider's bite is a severe and persistent headache that will not go away with medication.