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Isopods belong to the class of higher crustaceans. They can grow from 0.3 mm to almost 50 cm in size. They are flattened from the back to the belly. They have seven pairs of legs. The gills sit at the rear legs. However, different species have different levels of adaptation to life on land. Therefore, there are also species with other respiratory organs such as tracheas or lungs besides gill breathing.