What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?
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Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).
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