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Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure. Of the 50,000 known spider species in the world, only 25 have venom that can cause harm to humans. That's just 1/20 of 1% of dangerous spiders
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