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These can be categorized into three groups; cestodes, nematodes and trematodes. Examples include: Acanthocephala; Ascariasis (roundworms) Cestoda (tapeworms) including: Taenia saginata (human beef tapeworm), Taenia solium (human pork tapeworm), Diphyllobothrium latum (fish tapeworm) and Echinococcosis (hydatid tapeworm)
Taenia pisiformis, commonly called the rabbit tapeworm, is an endoparasitic tapeworm which causes infection in lagomorphs, rodents, and carnivores. Adult T. pisiformis typically occur within the small intestines of the definitive hosts , the carnivores.
Eucestoda, commonly referred to as tapeworms, is the larger of the two subclasses of flatworms in the class Cestoda (the other subclass being Cestodaria). Larvae have six posterior hooks on the scolex (head), in contrast to the ten-hooked Cestodaria .
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Diphyllobothrium is a genus of tapeworms which can cause diphyllobothriasis in humans through consumption of raw or undercooked fish. The principal species causing diphyllobothriasis is D. latum, known as the broad or fish tapeworm, or broad fish tapeworm. D. latum is a pseudophyllid cestode that infects fish and mammals.
Tetraphyllidea is a large tapeworm order that contains some 60 genera and about 800 described species. Tetraphyllideans are remarkable for their scolex morphologies, which are the most varied and morphologically complex amongst all tapeworm orders. Tetraphyllidean cestodes also exhibit a remarkable degree of host specificity.
When the annelid is eaten by a fish, the tapeworm matures. Catfish, suckers, and minnows are among the fishes that can serve as definitive hosts. The genus Archigetes Leuckart, 1878, [2] a caryophyllidean, is unique among all tapeworms in that its species can mature in invertebrate hosts (Oligochaeta), i.e. have a monoxenic (direct) life cycle. [3]
The body can be as long as 25 cm, and generally 1–1.5 cm broad. The body is divisible into the head region called 'scolex', followed by an unsegmented 'neck', and then by highly segmented body proper called 'strobila'. [4] The scolex bears four suckers and a rostellum, which are the organs of attachment to the host.