Nematoda A phylum of pseudocoelomate invertebrates comprising the roundworms. They are characterized by a smooth narrow cylindrical unsegmented body tapered at both ends. They shed their tough outer cuticle four times during life to allow growth.

Are nematodes segmented?

With regards to morphology, nematodes are mostly non-segmented with a cylindrical cross-section with most of them being microscopic (less than one millimeter in length). ... While a good number of nematodes are free-living organisms, there are many parasitic species.

Do nematodes have Unsegmented bodies?

All the above phyla are unsegmented and have no coelom. Other invertebrates (Annelida, Arthropoda, etc.) are coelomate, and segmented.