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Fasciola hepatica
''Fasciola hepatica'', also known as the common liver fluke or sheep liver fluke, is a parasitic trematode (fluke or flatworm, a type of helminth) of the class Trematoda, phylum Platyhelminthes that infects the livers of various mammals, including humans. The disease caused by the fluke is called fascioliasis or fasciolosis, which is a type of helminthiasis and has been classified as a neglected tropical disease. ''F. hepatica'' is distributed worldwide, has been known as an important parasite of sheep and cattle for hundreds of years and causes great economic losses in sheep and cattle. Because of its size and economic importance, it has been the subject of many scientific investigations and may be the best-known of any trematode species.
== Morphology ==
''Fasciola hepatica'' is one of the largest flukes of the world, reaching a length of 30 mm and a width of 13 mm. It is leaf-shape, pointed at the end or posteriorly, and wide in the front or anteriorly, although the shape varies somewhat. The oral sucker is small but powerful and is located at the end of a cone-shape projection at the anterior end. The acetabulum is larger than the oral sucker and is anterior. The internal tegument is covered with large, and scalelike spines. The intestinal ceca are highly dendritic and extend to near the posterior end of the body. The testes are large and greatly branched, arranged in tandem behind the ovary. The smaller, dendritic ovary lies on the right side, coiling between the ovary and the preacetabular cirrus pouch. Vitelline follicles are extensive, filling most of the lateral body and becoming confluent behind the testes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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