The 12 Venomous Spiders

When the name of the spiders comes to our minds, then the first thing we think of is the poison. This is just because spiders are considered extremely poisonous and harmful creatures. Their biting can cause severe health problems and sometimes the victim even dies at the spot. Out of the big list of poisonous spiders, we have enlisted the most poisonous spiders in the world.

1. Goliath Birdeater

Goliath Birdeater Tarantula is one of the biggest and most terrible spiders in the world. It is mainly found in forests and wetlands and looks like a panic. This dangerous spider possesses horrible and life-killing venom which it injects into the victim body for getting blood for its survival.

2. Funnel-Web Spider

The funnel-web spiders are present in Australia and Switzerland. Their habitat is wet areas and deep forests. These spiders attack their victims for getting blood and if they bite us, our body will undergo fever, giving rise to dropping of eyelids and sudden heart-attack.

3. Mouse Spider

These spiders can survive in any country and environment that is available to them. The color of the female and the male is different. The females are black and the male ones are brown. The symptoms by the bite of this spider resemble a lot to that of funnel-web spider. The spider is very aggressive and would respond to any thing that the spider feels dangerous.

4. Brazillian Wandering Spider

The Brazilian Wandering Spider is a large brown spider similar to North American Wolf Spiders, but bigger and possessing a more toxic venom.  It has the most neurologically active venom of all spiders, and is regarded as the most dangerous spider in the world.  Brazilian Wandering Spiders are active hunters and travel a lot.  They tend to crawl into cozy, comfortable places for the night and sometimes crawl into fruits and flowers that humans consume and cultivate. If the spider has a reason to be alarmed, it will bite in order to protect itself, but unless startled or aggravated, most bites will be delivered dry (i.e. without venom). Venom bites will occur if the spider is pressed against something or hurt. In this case, the high levels of serotonin contained in the venom will deliver a very painful bite that can result in muscle shock.

5. Black Widow

Black widows are notorious spiders identified by the colored, hourglass-shaped mark on their abdomens. Several species answer to the name, and they are found in temperate regions around the world.  Approximately 5 percent of the reported bites were fatal prior to the invention of Widow spider antivenom. One of their favorite haunts is an old fashioned outhouse.  Sixty-three deaths were reported in the United States between 1950 and 1959, most of which occurred in or around a woodpile or outhouse. But with the modernization of home plumbing and heating, Black Widow bites are now very rare.

6. Wolf Spider

Wolf spiders belong to the family Lycosidae, a large and widespread group that is found throughout the world. They are named for their wolflike habit of chasing and pouncing upon prey. About 125 species occur in North America, whereas there are about 50 in Europe. Numerous species occur north of the Arctic Circle. Most are small to medium-sized. The largest has a body about 2.5 cm (1 inch) long and legs about the same length. Most wolf spiders are dark brown, and their hairy bodies are long and broad, with stout, long legs. They are noted for their running speed and commonly occur in grass or under stones, logs, or leaf litter, though they may invade human dwellings that harbor insects. Most species build silk-lined, tubular nests in the ground. Some conceal the entrance with rubbish, whereas others build a turret-like structure above it. A few species spin webs. Wolf spider eggs are contained in a gray silk sac attached to the female’s spinnerets, or silk-producing organs, so that she appears to be dragging a large ball. After hatching, the young spiders ride on the mother’s back for several days.
Although the spider is not considered to be aggressive, it will often bite people in self-defense.

7. Brown Widow Spider

The brown widow is thought to have evolved in Africa, but the first specimen described came from South America. It is classified as an invasive species elsewhere around the world. Brown widow populations have appeared in southern California, the Caribbean, the U.S. states of the Gulf Coast, as well as in Japan, South Africa and Madagascar, Australia, and Cyprus. The species makes its home in buildings, inside old tires, and under automobiles, as well as among shrubs and other vegetation.
The spider has a brownish appearance that ranges from tan to almost black. The abdomens of some specimens have ornate dark-brown, black, white, yellow, or orange markings. Unlike other members of the genus, the hourglass marking on the underside of the brown widow is orange.
Brown widow venom is considered to be twice as powerful as that of the black widow; however, the species is not aggressive and only injects a tiny amount of venom when it bites. Still, brown widow bites were associated with the deaths of two people in Madagascar in the early 1990s. (These victims they were in poor health and they were not treated with antivenin.)

8. Brown Recluse Spider

The recluse spiders occur in warmer climes throughout the world. Also known as violin spiders, fiddle-backs or even reapers these six-eyed spiders all possess tissue destroying venom and belong to theLoxosceles family.

Recluse spiders have garnered quite a reputation for themselves over recent years and the internet is awash with some pretty ugly photos of the effects of their bite. The venom of this group of spiders is known to be necrotic, i.e. flesh-eating and whilst usually mild, can result in a condition known as Loxoscelism. In these severe cases the area around the bite begins to die and a deep open sore is formed. There is no effective treatment for these bite wounds and they may take months to heal, sometimes requiring skin grafts.
In the very worse cases limbs have needed to be amputated and there have been a significant number of fatal bites, particularly from the Chilean recluse.

9. Six-eyed Sand Spider

Like their close relatives, the recluse spiders, the venom of the six-eyed sand spider is a powerful cytotoxin. In the case of Sicarius the venom is both hemolytic and necrotic meaning it causes blood vessels to leak and destruction of flesh. The scientific name for this spider’s family is Sicarius which means ‘murderer’ and the spider is certainly an assassin. It hunts by burying itself in the sand and waiting for its unsuspecting victim to wander by at which point it pounces. In trials it was shown that the venom from a bite was fatal to rabbits in as little as 5 hours.

10. Yellow Sack Spider

This spider can be located in the North Europe, Japan, India, Australia and the South Africa. Although the Yellow Sack Spider or Cheiracanthium are reluctantly biting human being but still, you must be extremely careful when you accidentally found this spider in your environment.

11. Fringed Ornamental Tarantula

Fringed Ornamental Tarantula or Poecilotheria ornate is also known as the biggest species among the other spiders. This spider is the endemic fauna in the forest of Sri Lanka. They live on a tree by making a nest shaped like asymmetric cones.

12. Earth Tiger

This species is considered as the oldest species in the world. The earth tiger spider can be located in China and Vietnam. The earth tiger spider is known as aggressive animal. Although they are aggressive in nature but they are reluctant to attack the human unless when they feel threatened.