Brazilian Wandering Spider (Phoneutria nigriventer)

Roam the forest floors and banana plantations of South America, the Brazilian Wandering Spider (Phoneutria) is named for its active nocturnal hunting rather than building webs. Armed with potent PhTx3 neurotoxins that activate voltage-gated calcium channels, its bite produces searing systemic pain, cold sweats, loss of muscle control, and severe priapism in male victims. Guinness World Record holder for the most toxic spider in the Americas, producing agonizing PhTx3 neurotoxins. Ranks #10 completing the deadliest venoms ranking; while effective antivenom and dry bites keep modern human mortality low, the raw neurotoxic potency of PhTx3 makes Phoneutria the most toxic arachnid in the Americas according to the Guinness World Records.