巴西流浪蜘蛛（学名:Phoneutria nigriventer）是世界上毒性最强的蜘蛛，又被称为香蕉蜘蛛，因为牠喜欢躲藏在香蕉树里，主要分布在中南美洲，毒性大概可以毒死一只老鼠，牠的毒性属于神经毒，毒性会使神经失控、呼吸困难，严重时可能丧命，被牠咬到要快点迅速就医，这种蜘蛛如果受到威胁会摆起跳舞姿势来做出警告。

巴西游蛛体型较大，除了会捕捉昆虫外，也以小型脊椎动物为食。巴西游蛛属于夜行性动物，白天躲在香蕉树上或树洞里，晚上出来觅食。

Phoneutria, commonly known as Brazilian wandering spiders, armed spiders (armadeiras, as they are known in Brazilian Portuguese), or banana spiders (a name shared with several others), are a genus of aggressive and venomous spiders of potential medical significance to humans. They are mainly found in tropical South America, with one species in Central America. These spiders are members of the family Ctenidae of wandering spiders.