Polyps reproduce by asexual budding. The cilia beat in waves for propulsion. In addition, two long tentacles extend from the body for gathering prey. Although closely related to cnidarians, ctenophorans lack nematocysts and have slightly more advanced tissues. The phylum Platyhelminthes includes the free-living turbellarians as well as the parasitic flukes and tapeworms.
Asexual reproduction is by transverse fission.
Flukes Trematodes are internal or external parasites of living vertebrate hosts. The body consists of an anterior scolex solely for attachment to the host's gut and a string of proglottids, each of which possesses both male and female organs. Ribbon Worms Members of the phylum Nemertea are likely related to turbellarians because of the external cilia and tissue organization. The most unique feature is the proboscis, which normally lies in a special cavity until pushed out by hydrostatic pressure to stab some prey. They are bilateral and possess a slender tapered body.