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This 1973 image depicts two Taenia solium cysticerci, which represent the larval, or intermediate, immature developmental stages of this pork tapeworm.Life cycle of Taenia saginata and T. solium (See PHIL 3420 for a illustrative diagram depicting the following life cycle):Taeniasis is the infection of humans with the adult tapeworm of T. saginata or T. solium. Humans are the only definitive hosts for T. saginata and T. solium. Eggs or gravid proglottids are passed with feces; the eggs can survive for days to months in the environment. Cattle (T. saginata) and pigs (T. solium) become infected by ingesting vegetation contaminated with eggs or gravid proglottids. In the animal's intestine, the oncospheres hatch, invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal.Created: 1973
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This photomicrograph revealed some of the ultrastructural morphology exhibited by an adult cestode, Echinococcus granulosus, which had been found in a dog. E. granulosus causes what is known as cystic echinococcosis. As dogs and other canids are the only definitive hosts for Echinococcus, adults are not expected to be found in the human host. Adults range from 3mm - 6mm in length and usually consist of a scolex, and three proglottids. The third (terminal) proglottid is gravid, and is longer than wide, as can be seen in this instance. The scolex contains four suckers and a rostellum with 25 - 50 hooks.Created: 1975
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USNM 1368843, USNPC 073276 - 73276Tmartis5xcysticercus001
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USNM 1368842, USNPC 073275 - 73275Tmartis10x001
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USNM 1376301, USNPC 080962 - 80962Thydat20xdeepfocus001
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USNM 1389492, USNPC 094351 - 94351Thyad10xspec2001
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USNM 1376301, USNPC 080962 - 80962Thydat20xhifocus001
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USNM 1389495, USNPC 094354 - 94354Thyad10x001
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USNM 1389495, USNPC 094354 - 94354Thyad20x001
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USNM 1389494, USNPC 094353 - 94353Thyad10x16x001
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USNM 1389496, USNPC 094355 - 94355Thyad10x001
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USNM 1389492, USNPC 094351 - 94351Thyad10x001
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USNM 1374150, USNPC 078734 - 78734Tpisif10x001
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USNM 1374150, USNPC 078734 - 78734Tpisif20x001
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USNM 1369026, USNPC 073459 - 73459Ttaenia5x001
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USNM 1385242, USNPC 090052 - 90052Tomissa10xsmhooks001
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USNM 1374148, USNPC 078732 - 78732Tovis20x001
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USNM 1385242, USNPC 090052 - 90052Tomissa5x16x001
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USNM 1385242, USNPC 090052 - 90052Tomissa10x001
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USNM 1340306, USNPC 039860 - 39860Ctenuicol10x001
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USNM 1340302, USNPC 039856 - 39856Ctenuicol20x001
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USNM 1368844, USNPC 073277 - 73277Ttwitchellis10x001
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USNM 1368844, USNPC 073277 - 73277Ttwitchellis10x002
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USNM 1368844, USNPC 073277 - 73277Ttwitchellis5x001