囊尾幼虫 bladder worm,metacercoid
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多节绦虫之六钩幼虫被中间宿主摄取后,侵入肠壁或胃壁,经血管或淋巴管被运送到一定部位(依绦虫之种类而定)吸取宿主之体液,膨大而成胞囊状的幼虫,即为囊尾幼虫。中间宿主仅为1个者,有囊尾蚴(其特殊型有多头蚴和包虫)、拟囊尾蚴和实尾蚴。需 2个中间宿主者,已知有原尾蚴和双槽蚴二型。上述幼虫若与中间宿主或中间宿主组织的一部分一起被终局宿主摄取时,藉头节附着于其消化管壁,从颈部长出新的节片,成为成虫。
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