Most spider species can be traced back to the Devonian period, about 380 million years ago. It is estimated that today there are about 40,000 species of spiders on the planet, 60 of which have caused harm to human. Out of these 60 species, about a dozen are scientifically ranked as the deadliest, with some bagging the Guinness Books of Records for their painful, poisonous bites; killing in record time.

Spiders, arachnid family, are categorized as one of the most lethal and venomous animals in existence. However, it is wise noting that spiders play a crucial biological role in the ecosystem, pinning down the population of vermin like mice and insects.

Spiders are almost everywhere. Their creepy nature makes humans fear them so much, the ability to strike without warning. Spider venom works by attacking human nervous system and the vital body organs rendering them non-functional, leading to instant death in some cases. Spider bite symptoms range from nausea, fatigue, pain and worse, death.

Here is an expert compilation of the most dangerous spiders based on their threat to humans and median lethal dose, the lower the dosage the more deadly it is:

Brazilian Wondering Spider

A creature mostly found in Latin America. Their body size averages 0.7 to 1.9 inches about 1.7 to 4.8 cm. Their size including leg is approximately 17 cm. The Brazilian wandering spider has been named the most poisonous spider globally. They are very aggressive and active, attack fiercely like nothing else and do it several times. Phoneutria fera, the Brazilian Huntsman species particularly wins this tag. It has been rated to posses the most neurotics venom compared to any other spider in the world.

They are also called armed spiders or the banana spiders. They are responsible for hundreds of children death globally.


Black Midow

The biologists classify it as latrodectus mactans. They are plenty in the Southern United States, and also found everywhere in the Western Hemisphere. The males are smaller at 8 mm while the females 1.5 cm. The male’s size including legs is at 1.5 cm for females and makes 0.5 cm. The female brown midow venom is 15 times more dangerous than a rattle snake poison.

The female black meadow naturally eats the male partner after sex. When the spider strike, the poison travels quickly I the bloodstream followed by trouble in breathing, nausea, chills, delirium, spasms, and partial paralysis.

The United States reported 2,168 bites in 2010, with 892 cases being treated in healthcare facilities. Anti-venoms are tested to effectively damage the spider venom.


Brown Recluse Spider

Brown recluse spider is found in Nebraska, Illinois, Iowa, Indiana, Georgia, and Texas to Kentucky. It is about 1.5 to 1.7 inches long. It Is classified as “synanthropic” implying that it forges a close relationship to humans. Basically, people attract brown recluse’s food.

Brown recluse can be found under unused drawers, woodpiles or under porches. It is nocturnal, and feeds on insects and bugs. The bite is not painful and may go unnoticed for a few hours until when the pain starts to become severe. The spider injects its venom on the human body when it is disturbed, causing a red swelling around the sting. The swelling begins to grow gradually, to a painful deep skin ulcer. This leads to serious scarring calling for surgery to get rid of the necrotic tissues.

Recluse can go for more than six months without food. It only has three pairs of eyes, against the normal four. It is also called a violin or fiddle back spider.


Yellow Sac

They are all over in North America. About 0.25 to 0.5 inches long. The yellow sacs are common both outdoors and inside homes. Their name originated from the fact that they do not weave webs. They create their young in silken tubes in the wall corners or ceilings. The yellow sacs venom leaves the victim skin dead or lesions. They feed habit is ridiculous; they feed on their own eggs, other spiders and insects. Their venom is necrotic and interferes with organs functioning. The effect of the venom can be neutralized by injecting anti-venom before it spreads to other parts of the body.


Redback Spider

The female are larger than the males. Found mostly in Australia. They belong to the same family species with Black Midow. Redback spider venom attacks some people severely than others, depending on every individual immune system. The spider bite symptoms include respiratory failure, swollen lymph nodes, muscle shakes, seizures or coma. Every year, some 250 people in America alone are given anti-venom for Redback attack. Out of the 250, 80% cases have no serious effects with the other cases people experience pain for a day or less.


Six-eyed Sand Spider

A South African spider with the ability to camouflage on the sand or bury itself underground. One can only notice the spider through the crab like legs when it is on the move. The spider rarely attacks human, but when it does, it is venomous. Its poisons can lay a rabbit to death in hours. There are few cases of human fatalities from six-eyed sand spider. Its venom makes the tissues to break, causes a leak in blood vessels leading to organ failure. The six-eye sand spider rarely bites unless one causes disturbances.


Sydney Funnel-web

Found in Australia and USA. Measures between 0.4 to 2 inches. Sydney has huge venomous fangs that allow it to inject huge doses of venom when it bites. The Sydney funnel spider has venom called atracotoxin, which can kill a child in less than 20 minutes. The venom is very painful around the bite causing vomiting, nausea and spasms. It is very aggressive, and strikes more than three times. They are also commonly found in the home both outdoors and inside the house. They form webs in the corners of the pouches and grasslands.

Besides box jelly fish, king cobra, the blue ring octopus, and the death stalker scorpion, spiders are another very venomous species. The Brazilian wonderer is the most venomous spider today. The spiders are feared, because of their deadly nature. When not attended to on a timely manner, they lead to fatalities, in some cases death. These are the seven deadliest spiders in the world.


Robert Gombos

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