Worms are well known in the animal kingdom, but did you know that there are various kinds that exist in more than one major group, or phylum, of animals? One worm phylum includes flatworms, which, as the name suggests, are flat in shape. They also do not have body segments, a trait that separates them from the major group (or phylum) of segmented worms, the Annelida, which includes earthworms on land, as well as many aquatic worms that are mostly part of the families of worms known as polychaete worms.

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