BIOL 2030 Lecture Notes - Lecture 8: Trematoda, Flatworm, Skeletal Muscle
17 Sep 2015
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Cestodes: has 2 developmental stages: oncospheres and cysticercus, has 1 or 2 intermediate hosts, 1st developmental stage is oncospheres (eggs) eggs are ingested by the intermediate host(s) Obtain entrance into a definitive host: 2. Get fertilized eggs/ embryos out of host in cestodes form in the gi tract and eliminates its eggs through gi tract as wastes is eliminated by the definitive host: 6. Contact, recognize and enter an appropriate new (intermediate) host. Trematodes ( 10000 spp: complex system, fluke = old term for termatodes. Life cycle typically includes 5 developmental stages: 2. Life cycle typically includes 2 or more int hosts. 1st intermediate host is always gastropod mollusk: only 2 out of 10000 spp don"t have mollusk as their 1st int host. 2nd intermediate host can be anything that eats fish: 3. Specificity for 1st intermediate host always high: 4. Specificity for other intermediate, and definitive host low: 5. Adulthood only achieved in a definitive vertebrate host: 6.
