Advertisement I am wondering, I believe the most venemous scorpion in the world is L. Quinquestriatus and according to some it is A. Crassicauda. But is one of these scorpions more venemous than the most venemous spider in the world? Some of these most venemous spiders are the black widow, the red back spider, the brown recluse, the funnelweb spider. And according to scientis the brazilian wondering spider (phoneutria nigriventer) is the most venemous spider in the world. So who do you think is more venemous, a spider or a scorpion?