Cacing pita sejati bersifat hermafrodit dan memiliki daur hidup yang lebih sederhana dari Trematoda. Cacing pita tidak mengalami fase aseksual dalam siklus hidupnya. Ujung kepala Cestoda yang memiliki kait disebut dengan skoleks en: scolex. Di belakang skoleks terdapat rangkaian segmen yang masing-masing disebut proglotid.
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Description[ edit ] Taenia saginata proglottid stained to show uterine branches: The pore on the side identifies it as a cyclophyllid cestode. An adult worm is normally 4 to 10 m in length, but can become very large; specimens over 22 m long are reported. Typical of cestodes, its body is flattened dorsoventrally and heavily segmented. It is entirely covered by a tegument. The body is white in colour and consists of three portions: scolex , neck, and strobila.
The scolex has four suckers, but they have no hooks. Lack of hooks and a rostellum is an identifying feature from other Taenia species. The neck is the shortest part of the body, and consists of immature proglottids. The midstrobila is made of mature proglottids that eventually lead to the gravid proglottids, which are at the posterior end. An individual can have as many as to proglottids.
It derives nutrients from the host through its tegument, as the tegument is completely covered with absorptive hair-like microtriches. It is also an acoelomate , having no body cavity. The inside of each mature proglottid is filled with muscular layers and complete male and female reproductive systems, including the tubular unbranched uterus , ovary , genital pore, testes, and vitelline gland.
In the gravid proglottid , the uterus contains up to 15 side branches filled with eggs. Oncospheres enter the duodenum , the anterior portion of the small intestine, and hatch there under the influence of gastric juices. The embryonic membranes are removed, liberating free hexacanth "six-hooked" larvae. With their hooks, they attach to the intestinal wall and penetrate the intestinal mucosa into the blood vessels.
The larvae can move to all parts of the body by the general circulatory system , and finally settle in skeletal muscles within 70 days. Inside the tissue, they cast off their hooks and instead develop a protective cuticular shell, called the cyst.
Thus, they become fluid-filled cysticerci. Cysterci can also form in lungs and liver. The inner membrane of the cysticercus soon develops numerous protoscolices small scolices that are invertedly attached to the inner surface. The cysticercus of T. Once reaching the jejunum , the inverted scolex becomes evaginated to the exterior under stimuli from the digestive enzymes of the host.
Using the scolex, it attaches to the intestinal wall. The larva mature into adults about 5 to 12 weeks later. Adult worms can live about 25 years in the host.
In each mature proglottid, self-fertilisation produces zygotes , which divide and differentiate into embryonated eggs called oncospheres. With thousands of oncospheres, the oldest gravid proglottids detach. Unlike in other Taenia, gravid proglottids are shed individually. In some cases, the proglottid ruptures inside the intestine, and the eggs are released. The free proglottids and liberated eggs are removed by peristalsis into the environment.
On the ground, the proglottids are motile and shed eggs as they move. These oncospheres in an external environment can remain viable for several days to weeks in sewage , rivers, and pastures.
Intestinal obstruction in humans can be alleviated by surgery. The tapeworm can also expel antigens that can cause an allergic reaction in the individual. Taenia saginata has been reported as a cause of gallbladder perforation if left untreated in some cases.
Taenia saginata adult worms can live in the host for up to 25 years and most infections will last 2 to 3 years without treatment.
Jelaskan Daur hidup cacing pita (Taenia sp.)
Kamis, 04 Februari Jaringan Hewan Edit Cacing pita masuk dalam kelas Cacing Cestoda, Cacing ini mempunyai bentuk tubuh pipih panjang menyerupai pita sehingga disebut juga sebagai cacing pita. Tubuhnya dapat dibedakan menjadi dua bagian, yaitu skoleks kepala dan strobilus. Setiap strobilus terdiri atas rangkaian segmen-segmen yang disebut proglotid. Proglotid dibentuk melalui pembelahan tranversal di daerah leher, dan masing-masing berisi kelengkapan kelamin jantan dan betina, sehingga setiap proglotid dapat dipandang sebagai satu individu.
Siklus Hidup dan Gambar Cacing Pita (Taenia solium dan Taenia Saginata) | Cacing Cestoda
Description[ edit ] Taenia saginata proglottid stained to show uterine branches: The pore on the side identifies it as a cyclophyllid cestode. An adult worm is normally 4 to 10 m in length, but can become very large; specimens over 22 m long are reported. Typical of cestodes, its body is flattened dorsoventrally and heavily segmented. It is entirely covered by a tegument. The body is white in colour and consists of three portions: scolex , neck, and strobila. The scolex has four suckers, but they have no hooks.