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Arachnids Acari are a diverse group of small invertebrates belonging to the class Arachnida. They are characterized by having four pairs of legs, a body divided into two main regions (the cephalothorax and abdomen), and mouthparts adapted for piercing and sucking. Acari include mites and ticks, which can be found in a variety of habitats ranging from soil and water to plants and animals. These arachnids play important roles in ecosystems as decomposers, predators, and parasites.