中文摘要：

采自额尔齐斯河（中国段）湖拟鲤（Rutilus rutilus lacustris Pallas）鳃部寄生的西伯利亚拟双身虫（Paradiplozoon homoion homoion Bychowsky et Nagibina,1959）,系为我国首次报道,为新纪录。西伯利亚拟双身虫,隶属于扁形动物门（Playthelminthes）,单殖吸虫纲（Monogenea）,双身虫科（Diplozoidae）,拟双身虫属（Paradiplozoon）。通过对西伯利亚拟双身虫的形态特征分析,发现西伯利亚拟双身虫与原始虫种相比仅部分结构大小略有差异,其他形态基本一致。同时,对西伯利亚拟双身虫ITS2 rDNA序列进行了测定,并将结果与GeneBank中已发表的序列进行同源性分析。结果表明,在额尔齐斯河采到的西伯利亚拟双身虫与GeneBank中同种ITS2 rDNA序列的同源性为100%。

英文摘要：

It was the first time that Paradiplozoon homoion homoion Bychowsky et Nagibina, 1959 was found in China. Paradiplozoon homoion homoion Bychowsky et Nagibina, 1959, which was collected from the gills of Rutilus rutilus lacustris Pallas in the Irtysh River （Chinese section） in July 2010, belongs to Platyhelminthes, Monogenea, Diplozoinae, Paradiplozoon. Compared with the original Paradiplozoon homoion homoion Bychowsky et Nagibina, 1959, the morphological characteristics of the Paradiplozoon from the Irtysh River showed high similarities in basic morphological features but minor differences in structural sizes. The ITS2 rDNA sequence of the Paradiplozoon was tested and compared against the ITS2 rDNA sequences in Genebank for homogeneity. The results showed that the Paradiplozoon collected from the Irtysh River with a 100% of homogeneity in ITS2 rDNA sequence of the same spe- cies in Genebank.