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9 Cards in this Set
- Front
- Back
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Phylum Platyhelminthes |
-flatworms -tapeworms -flukes -monogenea |
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Phylum Platyhelminthes |
-bilateria -protostomata -Lophotochozoa |
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Body Plan |
-bilaterally symmetrical 0body and organs highly structured along anteior-posterior axis, dorsoventrally flattened -highly organised nervous system and sense organs in anterior part, cephalisation -Rhabdites (fused vesicles in epidermis) provide mucous sheath around body |
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Body Plan |
-tribloblastic: third germ layer- mesoderm -without a body cavity (acoelomoate) besides the gut |
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Digestion and excretion (Planarians) |
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Neodermata - unique adaptations to parasitic lifestyle |
-trematoda (flukes) and Cestoda (tapeworms) are parasites to most invertebrates -non-ciliated body covering, called syncytial tegument -adhesion mechanisms: suckers and/or hooks -reduction of sensory organs -increased reproductive capacity |
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Class Trematoda |
flukes -almost all endoparasites of vertebrates -often complex life cycles involving different stages: -egg -miracidium -sporocyst -redia -cercadia -metacercaria |
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Common liver fluke |
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Class Cestodes |
Tapeworms -no digestive system, nutrient intake via tegument -entire body covered with microvilli - increases surface area over which to absorb nutrients from the host -long flat bodies composed of scolex and many reproductive units of proglottids (not truly segments) |
