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Morphological feature of nematodes

What is the usual morphological feature of nematodes which distinguishes them from platyhelminthes?

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Nematodes are also termed as roundworms. As the name points out they are not flat like platyhelminthes. In evolutionary grounds with nematodes the primary complete digestive system appears, with anus and mouth, and the pseudocoelom is as well a novelty.

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