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From the funnel web spider to the brown recluse, here are some of the deadliest spiders on Earth.

Spiders are some of the most successful arthropods on the planet, having colonized every continent except Antarctica. Not all of these eight-legged arachnids are venomous, but some can be deadly to humans. From the notorious black widow to the ultra-deadly funnel web spider, here are some of the deadliest spiders on Earth.

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As their name suggests, brown recluse spiders (Loxosceles reclusa) have a shy nature and tend to hide away in dark, sheltered places. However, the brown recluse spider will bite if they feel threatened, and their bites can be deadly. They are usually found in the south and central United States, spanning southeastern Nebraska to southwestern Ohio, south to northwestern Georgia and into Texas.

The brown recluse spider can be dangerous to people because their venom contains a toxin that can cause skin necrosis (rotting). For the most part, symptoms, such as burning and itching at the bite site, as well as fever and nausea, develop a few hours after a bite. In extreme cases, the venom can lead to serious reactions or even death, especially to more vulnerable groups such as young children and the elderly.

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Even arachnologists have a hard time identifying hobo spiders, as there are many similar looking spiders and because there is great variation within the species itself. (Image credit: CreativeNature_nl via Getty Images)
Part of the family of spiders known as the funnel web spiders, the hobo spider (Eratigena agrestis, formerly Tegenaria agrestis) can be recognized by it's light to medium brown coloring and the multiple chevron patterns (v-shaped) on its abdomen pointing toward their head. They are often confused with the brown recluse spider (and vice versa), but the brown recluse is much more dangerous to humans. While hobo spiders have been known to bite if they feel threatened, there is much debate about how venomous they actually are. So much so that the Center for Disease Control and Prevention has removed them from their venomous spiders list. However, it's still wise to be cautious as hobo spider bites result in swelling and redness around the area, and can have more severe effects in young children.

link: https://www.livescience.com/deadliest-spiders

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