The most venomous spider in the world is generally considered to be the Brazilian wandering spider (Phoneutria spp.), particularly the Phoneutria nigriventer species. These spiders are found in South and Central America, including Brazil, hence their name. Their venom contains a potent neurotoxin called PhTx3, which affects the nervous system and can cause severe symptoms in humans, including pain, inflammation, muscle spasms, and, in some cases, priapism (prolonged erection).
It’s important to note that while the Brazilian wandering spider is widely regarded as the most venomous spider, there are other venomous spiders that should also be approached with caution, such as the Sydney funnel-web spider (Atrax robustus) and the redback spider (Latrodectus hasselti). Each spider species may have varying degrees of venom toxicity, and the danger they pose can depend on factors such as their behavior, habitat, and the sensitivity of the individual being bitten.