Phylum Platyhelminthes-flatworms-majority are parasitic-body plan: clear head and tail end, presence of intestines, mouth located at “bellybutton” area, bilateral symmetry, all 3 germ layers-skin has sticky substance that allows easy attachment to victim, has glands to secrete substance that allows easy movement-extensive and complex digestive tract-phylogeny on lecture 14 page 8-4 major groups: turbellarian(paraphyletic, nonparasitic), trematoda, mongenea, cestoda-turbellarians: freshwater flatworms-trematodes: ex: liver flukes,-cercimere(sp?) – hooks posterior end, hang on to host, flukes!, endoparasite-mollusc serves as intermediate host, vertebrate as final host-final host: lives in many different tracts: reproductive, digestive, etc.-live fluke: live inside bile duct, produce eggs inside bile duct
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