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What are examples of nematodes?

Ascaris, hookworm and filaria, all parasites of humans, are examples of nematodes (also known as roundworms).

Are nematodes exclusively parasites?

There are parasitic roundworms, including parasites of plants, but there are also free-living nematodes.

What is the typical morphological feature of nematodes that differentiates them from platyhelminthes?

Nematodes are also known as roundworms. As the name indicates they are not flat like platyhelminthes. In evolutionary grounds with the nematodes the first complete digestive system appears, with mouth and anus, and the pseudocoelom is also a novelty.