from Hany M. Elsheikha writing in Essentials of Veterinary Parasitology : Cestoda is a class of parasitic flatworms (Platyhelminthes), commonly called tapeworms or cestodes. All tapeworms use vertebrates as a definitive host, and vertebrates or invertebrates (arthropods, crustaceans) as an intermediate host, depending on the species. The definitive host harbors the adult, sexual, or mature stages of parasite. Larval 'metacestode' development occurs in the intermediate host (I.H.), which will be eaten by definitive host. In the latter, larval
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