Platyhelminthes . Flatworms have no body cavity other than the gut (and the smallest free-living forms may even lack that!) and lack an anus; the same pharyngeal opening both takes in food and expels waste. Phylum Platyhelminthes belongs to kingdom Animalia. PHYLUM PLATYHELMINTHES - ANIMAL CLASSIFICATION PROJECTMAX ... (Theodore Casey) The organisms are also known as flatworms. The platyhelminthes are mostly ecto or endoparasitic and few are free-living. Generalized as flatworms, platyhelminthes are aptly named for their flat bodies. Modern Latin (plural), from ' platy', means ' flat' + Greek ' helminth' means 'worm'. The Platyhelminthes excluding Acoelomorpha contain two main groups - Catenulida and Rhabditophora - both of which are generally agreed to be monophyletic (each contains all and only the descendants of an ancestor that is a member of the same group). Flashcards - Platyhelm...