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Spiders are arachnids. Other arachnids are scorpions, whip scorpions or vinegaroons, tailless whip scorpions, harvestmen or daddy-long-legs, mites/ ticks, solfugids or ‘sun spiders’, and pseudoscorpions. The closest relative of the arachnids are horseshoe crabs – count their legs, body parts, and look at their chelicerae.
