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Bucephaloidea
The Bucephaloidea are a superfamily of trematode flatworms, belonging to the large group Digenea. They contain numerous endoparasites of mollusks and fish. The name ''Bucephalus'' meaning "ox head" was originally applied to the genus ''Bucephalus'' because of the horn-like appearance of the forked tail (furcae) of its cercaria larva. By what Manter calls a "curious circumstance", horns are also suggested by the long tentacles of adult worms.
Most trematodes have several distinct developmental stages. The motile cercaria larva is released by the first intermediate host, typically a snail, and parasitizes a second intermediate host, where it encysts into a metacercaria. Finally, the adult flatworm typically inhabits the alimentary system or other body cavity of a fish.〔(【引用サイトリンク】url=http://www.fao.org/docrep/field/003/ac160e/AC160E03.htm )〕
Families in the Bucephaloidea include Bucephalidae and Nuitrematidae.〔(【引用サイトリンク】url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=108414 )〕
==Family Bucephalidae==
Bucephalids are trematode parasites of fish. The intermediate hosts include mollusks and at least one amphibian. One characteristic feature is an anterior rhyncus or holdfast that is separate from the digestive system. They also differ from other digeneans in the configuration of the digestive systems and genitalia.
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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