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Spiders - Mites, spiders, ticks, and scorpions belong to the Class Arachnids. They are air-breathing arthropods that have a body comprised of two regions; the cephalothorax and abdomen. They have six pairs of appendages of which four pair are legs. They have no antennae. Mites cause a variety of leaf galls. Most of the time the galls cause little injury. However, when the galls are very numerous, the leaves may die.