Though there are over 43,600 species of spiders, not all of them are venomous—or able to cause one form of injury or another, which can result into the death of the victim if left untreated for a prolonged period of time.
These air-breathing arthropods can be found all over the world, except in Antarctica. Among them, the Brazilian Wandering spider, the Six-eyed Sand spider, the Sydney Funnel Web, and the Black Widow spider are the most venomous.
Brazilian Wandering spider
Also known as banana spiders because of their tendency to inhabit or be found hiding in banana bunches, the Brazilian Wandering spider is chiefly common in tropical South America (with a single species evident in Central America).
It belongs to the Ctenidae family of wandering spiders, and was recently recognized in the Guinness Book of World Records as the most venomous of all spiders. It is able to envenom and kill preys such as crickets, other large insects, tree frogs, and even lizards.
The name “Wandering spider” is also given because of this species’ propensity to wander at night rather than hide in its lair.
Six-eyed Sand spider
Found mostly in deserts and sandy areas in Southern Africa, the Six-eyed Sand Spider is also known as the six-eyed crab-spider and can be found in some places in South America.
It is considered the second most venomous spider in the world and possesses venom, which when injected into a rabbit can cause its death within 5 to 12 hours.
It can often be found hiding in the sand and will strike at any prey that comes near its hideout.
Sydney funnel-web spider
Mostly found in Sydney, New South Wales, Australia, the Sydney funnel-web spider is venomous to the extent of causing death to humans if its bite is left untreated for long.
They range from 1.5 cm – 3.5 cm in size and are often dark-brown or black-colored with a glossy look to them.
Black Widow Spider
The Black Widow spider occurs in the genus Latrodectus and is part of the family Theridiidae with over 32 known species. Its name is a reference to a reproductive behavior distinctive to some species, which is the scenario of the female eating the male after mating.
Like the Black Widow Spider, the Redback spider is also found in the genus Latrodectus and so named because of the black body with a spot of red at the back that they possess.
It’s mostly common in Australia and preys on insects, lizards, and other spiders. The females, like the Black Widow spider, feed on their males after mating,
Its bite can cause death in humans if left untreated by the antivenom available.
Besides these top five most venomous spiders in the world, there are others that also have venom potent to some degree. A few of them are the Chilean Recluse spider, the Chinese Bird spider, the Fringed Ornamental Tarantula, and the Yellow Sac spider.