Abstract
Cestodes, or tapeworms, belong to the class Cestoidea of the phylum Platyhelminthes. Members of this family vary greatly in size and behavior; however, they share the same basic body plan. They attach to the intestinal wall of definitive hosts by the scolex, or head. The scolex is followed by the neck, behind which grow the body segments, or proglottids. The proglottids together form the strobila, or body, of the worm; the number of proglottids in the adult worm depends on the species. Proglottids have both longitudinal and transverse muscles and are motile. Each proglottid also has both male and female reproductive organs, but mating usually occurs with adjacent segments rather than by self-fertilization. The oldest proglottids are farthest from the scolex and contain the tapeworm’s eggs. Cestodes have no digestive or circulatory system and must absorb nutrients from the lumen of the host’s small intestine through microvilli. These cover the surface of each proglottid and excrete waste through a pair of excretory tubules. Tapeworms do have a rudimentary nervous system consisting of ganglia in the scolex and nerves in the proglottids.
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Bowman, N., Donroe, J., Gilman, R. (2006). Cestodes. In: Ortega, Y.R. (eds) Foodborne Parasites. Food Microbiology And Food Safety Series. Springer, Boston, MA. https://doi.org/10.1007/0-387-31197-1_8
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