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Platyhelminthes Flatworms Tapeworms Flukes
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PHYLUM PLATYHELMINTHES Bilateral Triploblastic Acoelomate –Gastrovascular cavity Cephalization Ladder-like nervous system Protonephridia with flame cells
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Fig. 21.15
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Symmetry
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Traditional View Continues Acoelomate - Pseudocoelomate vs Coelomate Aceolomate no space between tissue layers, no cavity
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Protonephridia with Flame cells
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Class Turbellaria Free living flatworms Example: Dugesia (Planaria)
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External Anatomy
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Ladder-like nervous system No real “brain”, but anterior ganglia
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Ladder Nervous System
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Fig. 21.18
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Planaria c.s.
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Class Trematoda Flukes All parasitic Possess two suckers Have complex life cycles Need multiple hosts
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Chlornorchis sinensis
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Fasciola hepatica w.m.
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Schistosoma sp. w.m.
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Schistosomiasis
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eosinophylls attacking a larval fluke.
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Class Cestoda Tapeworms Scolex and proglottids Segmented
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Diplydium caninum
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Scolex Anatomy Rostellum Suckers Neck
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Tapeworm development
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Proglottid anatomy Uterus Genital pore Ovary Testis
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Echinococcus granulosus w.m.
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Hydatid cyst Capsules of scolices
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Hydatid Cyst Disease
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