Henneguya zikawiensis Sikama 1 938,collected from Poyang Lake,Jiangxi province,were used to conduct a morphological and molecular study.It was found that the valve view takes the shape of an obovate and the frontal view a spin-dle.Its spores are 1 1.4 μm ± 0.94 μm(10.0 ~ 14.0)μm long,and 8.46 μm± 0.45 μm(8.0 ~10.0)μm wide and 7.3 μm ± 0.64 μm(7.0 ~ 8.0)μm thick,and each has two polar capsules 4.68 μm± 0.43 μm(4.0 ~ 5.5)μm in length and 3.30μm± 0.34 μm(2.5 ~ 4.0)μm in width with the polar filaments coiling 4 or 5 turns.Analyses of molecular phylogeny,genet-ic distance,variable site based on 18S rDNA indicated that the species (GenBank accession number:KR020026)in the present study is the same species toHenneguya sp.WB-LZH (GenBank accession number:JQ690355 )which has no specific name in the GenBank data base.Additionally,the species of Henneguya can not be separated from species of Myxobolus in the phylo-genetic analysis.This phenomenon combining the morphological comparison could further prove that urogomphus is not an ef-fective proof for the classification of myxosporeans.%对采集自江西鄱阳湖水域的徐家汇尾孢虫 Henneguya zikawiensis Sikama 1938进行了形态学和分子系统学的研究.徐家汇尾孢虫孢子壳面观呈倒卵形,缝面观呈纺锤形.孢子长11.40μm ±0.94μm(10.0~14.0)μm,宽8.46μm±0.45μm(8.0~10.0)μm,厚7.3μm±0.64μm(7.0~8.0)μm.两个梨形极囊,长4.68μm ±0.43μm(4.0~5.5)μm,3.30μm±0.34μm(2.5~4.0)μm,极丝4~5圈缠绕.基于18S rDNA 的系统发育树、遗传距离、变异位点分析表明,本研究所得到的徐家汇尾孢虫(登陆号为：KR020026)与 GenBank 库中的尾孢虫未定种 Henneguya sp.WB-LZH(登陆号为：JQ690355)是同一物种.另外,系统发育分析并不能把尾孢虫属与碘泡虫属的物种分开,结合形态学比较,进一步证明了尾突不能作为一个有效的分类依据.
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