Phylum Platyhelminthes

Phylum Platyhelminthes - Phylum Platyhelminthes -flatworms...

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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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