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Key People:Pierre-Joseph van Beneden...(Show more)Related Topics:CestodariaDwarf tapewormAporideaEucestodaCyclophyllidea...(Show more)

Tapeworm, additionally called cestode, any kind of member of the invertebrate course Cestoda (phylum Platyhelminthes), a group of parasitic flatworms containing around 5,000 species. Tapeworms, i m sorry occur worldwide and variety in size from around 1 mm (0.04 inch) to much more than 15 m (50 feet), are interior parasites, affecting particular invertebrates and the liver or cradle tracts the all types of vertebrates—including humans, residential animals, and other food animals, such as fish. Some strike a solitary host, others require one or two intermediate hosts as well as a final, or definitive, host throughout their life cycle. The disease caused through tapeworms is well-known as cestodiasis (q.v.).

Tapeworms room bilaterally symmetry (i.e., the right and also left sides room similar). Part consist that one long segment; others have a definite head, followed by a collection of identical segments called proglottids. The head, or scolex, bear suckers and also often hooks, which are offered for attachment to the host. The body spanning is a tough cuticle, with which food is absorbed. Over there is no a mouth no one a cradle tract. Tapeworms additionally lack a circulatory system and an organ specialized for gas exchange.

Most tapeworms space hermaphroditic (i.e., functional reproductive guts of both sexes occur in the exact same individual). They room usually self-fertilizing, and gonads the both sexes also occur within a single proglottid. The life cycle is complex. The pork tapeworm (Taenia solium, or Taeniarhynchus solium), uncovered wherever raw pork is eaten, lives in the human intestine in that adult stage. Every proglottid, complying with fertilization, might contain as many as 40,000 embryos encased in different capsules. If the embryos, which pass out through the host’s feces, are eaten by a mammal such as a dog, camel, pig, monkey, or person being, the larva increase in the cradle tract. It bores with the intestinal wall into a blood vessel and also is carried to muscle tissue in i beg your pardon it develops a safety capsule (encysts) and is called a cysticercus, or bladder worm. If the cysticercus is eaten alive in life meat, the attaches itself to the host’s intestine and also develops directly into a tires adult.

The life cycle of the beef tapeworm (Taenia saginata, or Taeniarhynchus saginatis), i beg your pardon occurs an international where beef is eaten raw or improperly cooked, is lot like the of the pork tapeworm. Man is the definitive host; livestock serve together the intermediate host.

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The fish tapeworm (Dibothriocephalus latus, or Diphyllobothrium latum), most common in waters of the north Hemisphere, infests humans and also other mammals that eat fish, particularly bears and dogs. Fertilized eggs happen from the host’s body in the feces. In a water medium they develop into a hairlike larva and are eaten by small crustaceans, which, in turn, are eaten by a fish. In the fish, the tapeworm larva encysts in muscle tissue. As soon as the fish is eaten by a mammal, the larva attaches come the mammalian intestine and develops into a tires adult. Fish master of this tapeworm incorporate trout, salmon, pike, and perch.