Atlas of livestock parasites
digitized collection of microscopical preparations

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Thysanosoma spp.



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"fringed tapeworm"

Distribution: Stilesia spp. is found in Europe, Africa, and Asia, whileThysanosoma spp. is  confined to North (western states) and South America.  

Host: Bile ducts, pancreatic ducts, and small intestine of ruminants , especially sheep, and camelids 

Life Cycle: Although these tapeworms have not been extensively studied, it is thought that their intermediate hosts may be oribatid mites. Like Moniezia, the defnitive host is infected following ingestion of the intermediate host.      

Diagnosis:  Adults are up to 15 to 30 cm long and 8 mm wide with an unarmed scolex of 1.5 mm maximum width. Proglottids are 5 to 6 times wider than long and have a conspicuous fringe on their posterior surface. Tapeworm segments are passed in the feces and eggs may be found in fecal fotation tests.  

Size: Approximately 30 × 20 µm              

Clinical features:  Adults may block the flow of bile and pancreatic juice, thus disturbing digestion and causing decreased gains in animals. Decreased weight gain may be the only sign of infection. These tapeworms have no economic importance unless they are present in  large enough numbers to cause liver condemnation at slaughter: makes the fringed tapeworm an economic problem.

Anthelmintic treatment of sheep to rid them of adults is the only method at present.


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