EVERYDAY SCIENCE

Detailed explanation-1: -Phylum Platyhelminthes. Phylum Platyhelminthes includes the flatworms, of which two classes, trematodes and cestodes, are parasitic to humans. The trematodes, or blood flukes, parasitize human skin or internal organs.

Detailed explanation-2: -Subclass Cestodaria Unsegmented tapeworms containing 1 set of genitalia; parasites of the body cavity or intestine of annelid worms or fish; about 105 species. Order Amphilinidea Uterus long and N-shaped; genital pores at or near posterior extremity; intestinal parasites of teleosts (bony fish); 105 species.