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Harvestmen (order Opiliones) are members of the class Arachnida, together with spiders, scorpions, pseudoscorpions, ticks and mites. Like all arachnids, harvestmen have four pairs of walking legs, a pair of chelicerae, and a pair of small, leg-like appendages called pedipalps.
These long-legged arachnids are found all around the world. They are most diverse in tropical Southeast Asia and South America, but there are harvestman species everywhere, even in much colder regions.