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check list 1 - Phylum Platyhelminthes (flat worms)...

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Phylum Platyhelminthes (flat worms) dorsoventrally flattened bodies bilateral symmetry true organ systems triploblastic (three true germ layers) one opening to the gastrovascular cavity acoelomate (have no body cavity). a. Class Turbellaria ( free-living flatworms ) Hermaphroditic Dugesia(planaria) Eyespots Regeneration pharynx fig 37. 2: three germ layers (ectoderm, mesoderm- muscular pharynx, endoderm) a. Class Trematoda (parasitic flukes) endoparasites and ectoparasites lack epidermis and are covered by metabolically active epicuticle  Opisthorchis(Clonorchis) chinese liver fluke  Fig 37.4: sucker, uterus, gastro-vascular cavity, testis Fasciola   Sheep liver fluke Sucks blood, mucus, and cells Fig 37.5: sucker, uterus, gastro-vascular cavity, testis Schistosoma blood fluke  disease schistomomiasis  intermediate hosts 
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definitive hosts dioecious(separate male and female)
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check list 1 - Phylum Platyhelminthes (flat worms)...

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