EVERYDAY SCIENCE

Detailed explanation-1: -The phylum Platyhelminthes consists of simple worm-like animals called flatworms (Fig.

Detailed explanation-2: -Phylum Platyhelminthes. Phylum Platyhelminthes includes the flatworms, of which two classes, trematodes and cestodes, are parasitic to humans.

Detailed explanation-3: -flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic-i.e., living on or in another organism and securing nourishment from it.

Detailed explanation-4: -Most parasitic flatworm species are contained within the classes Trematoda (flukes) and Cestoda (tapeworms). Trematodes, or flukes, have an enormous impact on the health of humans by infecting over 200 million people worldwide.

Detailed explanation-5: -Most turbellarians are members of the phylum Platyhelminthes, which also comprises the major parasitic groups of flatworms-namely the Monogenea (ectoparasitic flukes), Cestoidea (tapeworms), and Trematoda (endoparasitic flukes)-and which is considered part of the major Bilaterian group Lophotrochozoa.