What distinct structural characteristic differentiates Nematoda (roundworms) from Platyhelminthes (flatworms)?
Answer
Nematodes have cylindrical bodies.
The classification of helminths relies heavily on fundamental body structure differences observed microscopically. Roundworms, belonging to the phylum Nematoda, are structurally distinguished by having cylindrical bodies. Conversely, members of the phylum Platyhelminthes, which includes tapeworms and flukes, are characterized by their flattened body structure. This difference in geometry—cylindrical versus flat—is a key feature used to separate these major groups of parasitic worms, contrasting them sharply against other categories like the ringed or segmented worms (Annelida).
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