As a subject matter expert in arachnology, I can provide you with information on the world's most venomous spiders. It's important to note that "deadliest" can be subjective and may depend on factors such as the availability of antivenom, the population density of the spider, and the frequency of human encounters.

The Sydney funnel-web spider (Atrax robustus) is often cited as one of the most venomous spiders in the world. Its venom is highly potent, and prior to the development of antivenom in the 1980s, it was responsible for several human fatalities in Australia. However, with the availability of antivenom, there have been no recorded deaths since then.

Another contender for the title is the Brazilian wandering spider (Phoneutria spp.), which is known for its neurotoxic venom. While its bite can cause severe pain and symptoms, it is less likely to be fatal compared to the Sydney funnel-web spider, especially with prompt medical treatment.

It's also worth mentioning the black widow (Latrodectus spp.), which is found in various regions, including North America, Australia, and throughout the world. Its venom is very potent, but bites are rarely fatal to healthy adults.

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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.read more >>