They are found throughout the world, in Britain and Ireland there are about four species considered native and probably 17 non-native species that have become established, originating from the southern hemisphere. They are covered with mucus and usually leave a trail. They are small, flattened, animals often with a ribbon like appearance and unsegmented body. Land flatworms (Platyhelminthes) are a group (class of animal) of free-living worms.
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