2030lecture8 - 1 OUTLINE Phylum Platyhelminthes flatworms,...

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Unformatted text preview: 1 OUTLINE Phylum Platyhelminthes flatworms, flukes and tapeworms Animal Diversity 5 th Ed. Chapter 8, Pages 147 - 163 4 th Ed. Chapter 8, Pages 145 - 161 1. Introduction 2. Body Form and Structure(s) 3. Osmoregulation 4. Nervous Tissue 5. Parasitic strategies c c c c Lecture 8 - 1 PARASITIC STRATEGIES - CESTODES A successful parasite must; 1. Obtain entrance into a host 2. Locate appropriate environment within host 3. Maintain position within host 4. Reproduce within definitive host 5. Get fertilized eggs/embryos out of host 6. Contact and recognize an appropriate new host intermediate host/s (cysticercus) definitive host proglottid eggs (oncospheres) Lecture 8 - 2 2 PARASITIC STRATEGIES - TREMATODES Key Features 1. Life cycle typically includes 5 developmental stages 2. Life cycle typically includes 2 or more intermediate hosts 3. Species specificity for 1 st intermediate host always high 4. Specificity for other intermediate, and definitive, hosts low 6. Life cycle includes asexual replication of developmental stages, normally in 1 st intermediate host 5. Adulthood only achieved in a definitive vertebrate host Lecture 8 - 3 PARASITIC STRATEGIES - TREMATODES Lives in...
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This note was uploaded on 06/17/2010 for the course BIOLOGY bio 2030 taught by Professor .. during the Fall '10 term at York University.

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2030lecture8 - 1 OUTLINE Phylum Platyhelminthes flatworms,...

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