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在SEM下,卫氏并殖吸虫(三倍体型)毛蚴体表密布细长的纤毛。TEM示纤毛的微管呈典型的“9+2”形式排列。除纤毛外,体表密布一层点线状胞质突起。体表下依次为基质、基膜和肌肉层。肌肉层下方见一含大量直径为0.15μm左右的圆形结构的囊细胞。焰细胞2个,大小为3×5.4μm,胞质内含有许多线粒体。焰细胞的纤毛束由39～45根纤毛组成。胚细胞在体后部集中成团,体前、中部亦有分布。
Under the SEM, Paragonimus westermani (triploid) miracidia densely elongated cilia. TEM shows cilia microtubules arranged in a typical “9 + 2” form. In addition to cilia, the surface is covered with a layer of linear cytoplasmic protrusions. Under the surface of the matrix, basement membrane and muscle layer. See below the muscular layer contains a large number of 0.15μm diameter circular structure of the capsule cells. The flame cells 2, the size of 3 × 5.4μm, the cytoplasm contains many mitochondria. The cilia of flame cells consist of 39 to 45 cilia. Embryonic cells concentrated in the back of the body into a group, the body before, there are also central distribution.