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Unformatted text preview: covering of ingested eggs is digested away and the larvae burrow through the intestinal wall and travel by bloodstream to lodge and encyst in muscle; a cyst is a hard-walled structure sheltering a larval worm. If humans eat the meat of infected pigs or cattle and fail to cook it properly, they too become infected. The Phylum Rotifera Rotifers (shown in Figure 23) belong to the phylum Rotifera, which contains about 2,000 species. Rotifers are often observed in biology lab preparations. Their digestive tract is the inner tube and the rest of the animal is the outer tube (of a tube-within-a-tube body plan). Rotifers are microscopic and abundant in freshwater. A crown of cilia (corona) forms a rotating wheel that serves as both an organ of locomotion and acts to deliver food to the mouth. ....
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- Fall '10
- Biology, Digestive System, Cestoda, Flatworm, Rotifers, Acanthocephala