Among the medically important flatworms (platyhelminths), tapeworms (cestodes) are segmented, whereas flukes (trematodes) are unsegmented.

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The phylum Platyhelminthes (flatworms) contains groups such as turbellarians (which include planarians), monogeneans, flukes (trematodes), and tapeworms (cestodes). Among these, flukes and tapeworms are medically important parasites.

Species of Flatworms (Platyhelminths)

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Flukes, or trematodes (Class Trematoda), are nonsegmented flatworms that possess an oral sucker (and sometimes a second ventral sucker) used to attach to the inner walls of host organs, such as the intestines, lungs, liver, or large blood vessels. They have complex life cycles, often involving multiple hosts. Examples of trematodes include *Fascioloides magna* and *Fasciola hepatica*.

Flukes (Trematodes)

Tapeworms (cestodes) are a class of flatworms (platyhelminths) that are segmented and utilize suckers or hooks located at their head region (scolex) to attach to the wall of the host's small intestine.

Tapeworms (Cestodes)

Turbellarians are mostly free-living flatworms, including planarians, and are less medically relevant than tapeworms and flukes.

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