Class Cestoidea:
Main features: Platyhelminthes. Mainly intestinal parasites of vertebrates. Generally with single generation in life cycle and sexual adult in vertebrate; rarely with asexual reproduction in intermediary host. Life cycle is invariably indirect (i.e., one exception); wide range of invertebrates and vertebrates employed as intermediate hosts. Adult is segmented or not; with duplication of reproductive organs all along body (i.e., polyzoic) or not (i.e., monozoic); segmented forms polyzoic; and un-segmented forms are monozoic or polyzoic. Distinct scolex (i.e., head) is existed or absent. Syncytial tegument is generally however not always unarmed (i.e., at light microscope level) and gut is absent.
The cestodes, or tapeworms, take place as intestinal parasites of all classes of vertebrates. Their closest relatives are the monogeneans, ectoparasitic flukes mostly of fishes, from which they are probable to have been derived. There are 2 categories, the Cestodaria, that are monozoic forms, lacking a scolex (i.e., head) and parasitic in fishes and turtles, and Eucestoda, the majority of which are segmented and polyzoic. Only the latter category parasitizes humans.
The trematodes or ‘flukes’ are flatworms that originally developed as parasites of molluscs and virtually all species hold a molluscan element in the their life history. There are two groups, the Digenea and the Aspidogastrea, however only the former takes place in humans and other mammals.
Figure: Parasitic Helminthes
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