what are the 3 main species in this phylum?
flatworms, flukes, tapeworms
what are the 2 classes in this phylum and what is in them?
1) class Cestoda (cestoidea)- tapeworms
2) class Trematoda - flukes
name one key feature of the Platyhelminthes
they are dorsoventrally flattened
are the Platyhelminthes free living or parasitic?