碘泡虫是粘体动物的主要类群，也是鱼类重要的后生动物寄生虫，研究碘泡虫的系统分类学和寄生特异性，在其基础生物学和鱼类粘体动物病害防控方面均具有重要意义。本项目以我国淡水鱼类寄生碘泡虫为主要对象，从形态学、分子生物学、寄生特异性和系统发育等方面，开展鱼类碘泡虫的系统分类学与寄生特异性研究。本研究旨在完善碘泡虫的经典形态学研究，用分子数据佐证形态分类学，探明虫体确切寄生部位，厘清误定种和疑难物种，理清碘泡虫分类学的问题，发现新种、挖掘隐存种或新记录；同时，分析碘泡虫与宿主之间的协同进化模式，评价碘泡虫的宿主或器官特异性以及组织向性，探讨碘泡虫的感染途径和方式。本项目的完成将极大丰富鱼类碘泡虫的物种资源，为正确评价我国碘泡虫乃至整个碘泡虫属的系统进化模式和提升我国鱼类碘泡虫在国际上的分类地位提供有力的理论依据，并为我国重要水产经济动物碘泡虫病害的合理评估和相应防治策略的制定提供理论依据。

Myxosporea are an economically important group of microscopic metazoan endoparasites, especially infecting the cultured and wild fish. Myxobolus clade, the largest group of Myxosorea,has more than 800 species in the world, and more than 330 species in China.In past,criteria used for classification among myxosporeans include spore morphology, characteristcis of developmental stages,and host and tissue specificity.Especially in China, spore morphology was often used as a sole criterion for Myxobolus species.Therefore, there maybe exist many plausible and mistaken species. It will be great significant for the basic biology and fish disease prevention and control to study the systematic and parasitic specifity of piscine Myxobolus spp.In order to elucidate the species diversity and their phylogenetic relationships, we will take myxobolus species from freshwater fish of China as main object and study them from four aspects including morphology,molecular biology,phylogeny and parasitic specificity.In this program, the research on classical morphology will be perfected,Myxosporea named only by morphological characters will be examined with molecular data to ascertain whether they are valid, some plausible and mistaken species will be effectively identified and some new species,cryptic species or new records will be found,at the same time,the exact location of parasitic will be determined.Moreover,we will analyses the coevolution pattern between Myxobolus species and their hosts,evaluate host specificity, organ specificity or tissue tropism, and explore ways and means of parasite infection of fish Myxobolus spp.The completion of the project will greatly enrich Myxosporea species resources,and provide the strong theoretical basis for correct evaluation of the phylogenic relationship of Myxobolus species from China and even from genus Myxobolus and enhance the international taxonomic status of Chinese fish Myxosporea. At the same time,it will be beneficial to provide theoretical basis for rational evaluation on Myxosporidiosis of Chinese important aquatic economic animals and establish relevant strategy of prevention and control.