Chloe Kim #1 of the United States competes in the FIS World Cup 2018 Ladies Snowboard Halfpipe final during the Toyota U.S. Grand Prix on December 9, 2017 in Copper Mountain, Colorado. Matthew StockmanâGetty Images.
The phylum name Platyhelminthes literally means flatworms.. Members of this phylum are soft, thin-bodied, leaf or ribbonlike worms, including the familiar planaria of ponds and streams, as well as the flukes and tapeworms parasitic in human and other animal bodies.
Explain the basic body plan of members of the phylum Platyhelminthes. Identify representatives of the classes Turbellaria, Trematoda, and Cestoda. Compare and contrast the anatomy and morphology of free-living and parisitic flatworms. Describe the symmetry of this group. Platyhelminthes is a phylum composed of three classes of flatworms. The class Turbellaria (planarians) is free-living, while the remaining classes including the Trematoda (flukes) and Cestoda (tapeworms) are parisitic. Members of the phylum Platyhelminthes are dorsoventrally flattened.