9 of the World’s Deadliest Spiders | Britannica
Phoneutria are poisonous to humans, and they are considered to be the deadliest of all the world’s spiders. Their venom is toxic to the nervous system, causing symptoms such as salivation, irregular heartbeat, and prolonged, painful erections (priapism) in men. Scientists are investigating the venom of P. nigriventer as a possible treatment ...
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