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two sections, the cephalothorax or prosoma (there is no separate head), and an opisthosoma . the scientific discipline devoted to the study of ticks and mites is called acarology . most mites are tiny, less than mm ( in) in length, and have a simple, unsegmented body plan. their small size makes them
easily overlooked; some species live in water, many live in soil as decomposers , others live on plants, sometimes creating galls , while others again are predators or parasites . this last type includes the commercially important varroa parasite of honey bees , as well as the scabies mite of humans...
https://en.wikipedia.org/wiki/Mite