Which of the following is not a characteristic of nematodes?

Nematodes, also known as roundworms, are characterized by their unsegmented body structure, which distinguishes them from other types of worms such as annelids, which have segmented bodies. This unsegmented design allows them to have a cylindrical and elongated shape, contributing to their adaptability in various environments.

The round shape of nematodes is another defining feature, enabling them to move through soil and other substrates with relative ease. Additionally, the presence of a cuticle is significant as it provides protection against desiccation and serves a role in locomotion, allowing the nematodes to thrive in diverse ecological niches.

In summary, the presence of segmentation, which is not found in nematodes, forms the basis for why it is identified as not characteristic of this group.