16. Into which classe sare
platyhelminthes divided? How
are these classes
characterized and what are
some representative beings of
each of them?

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Platyhelminthes are divided three
classes: turbellarians ( Turbellaria),
trematodes (or ) and
cestodes (or ).

Turbellarians are free-living
and their main
is the planaria (
tigrina). Trematodes are , they
live inside host and the
(Schistosoma mansoni) that
schistosomiasis is an . Cestodes
are parasites , they do not
digestive tubes and cells are
nourished absorption of nutrients
the host; their popular
representative are beef and pork
(Taenia saginata and
solium) that parasite .