Taxonomic level: phylum Nematoda; grade of construction: organs derived from three tissue layers; symmetry: bilateral; type of gut: complete; type of body cavity other than gut: pseudocoel; segmentation: absent; circulatory system: present; nervous system: small bundles of nerves (ganglia), two nerve cords; excretion: ...

Do nematodes have Metameric segmentation?

b. Some nematodes look like they are segmented, but there is no internal repetition of parts. ... Leeches are metameric, but the number of external segments is less than the internal segments.

Are nematodes non-segmented?

Nematodes (roundworms) are non-segmented worms (helminths) with elongate cylindrical bodies.