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The outermost is a smooth and undifferentiated layer called cuticular mantle. The middle is composed of cells that resemble epithelial cells. The innermost is made up of muscle and other fibres. Inside the vesicular wall is an invaginated (facing inward) scolex. The scolex contains suckers and hooks, and a neck attached to a rudimentary body ...
The ventral sucker is located halfway to the middle of the body on the ventral side. They are both used for attachment to intestinal wall and blood vessels. The detailed structure of the suckers, presence or absence of hooks, and their exact position on the body are major taxonomic keys between species. [8]
When a person eats pork infected with cysts, the scolex (the head of the tapeworm) evaginates and clings to the intestinal wall using its suckers and hooks. Once attached, the segments of the tapeworm, called proglottids, multiply and grow. Within about four months, the tapeworm matures into a ribbon-like structure, measuring 2–4 meters long.
The common name, glass squid, derives from the transparent nature of most species. Cranchiid squid spend much of their lives in partially sunlit shallow waters, where their transparency provides camouflage. They are characterised by a swollen body and short arms, which bear two rows of suckers or hooks. The third arm pair is often enlarged.
Sucker or bothridia, and rostellum with hooks: Oral sucker and ventral sucker or acetabulum: Lips, teeth, filariform extremities, and dentary plates Number of species 6000 [23] Estimated > 15,000 [24] Registered > 9,000 [25] Estimated > 800,000 to 1,000,000 Registered > 25,000 [24] Number of species known to infect humans 40 [23] 16 [24 ...
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