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Morphological features of the phylum Annelida

Explain some morphological features which distinguish the beings of the phylum Annelida from nematodes and platyhelminthes?

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The Platyhelminthes are worms with flat bodies (or flatworms), nematodes are worms with cylindrical however not segmented bodies (or roundworms). Annelids are cylindrical worms with segmented bodies (that is, they are metameric).

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