黏孢子虫是一类寄生于海淡水鱼类的危害性寄生虫，其真实系统进化地位一直是国际间的研究热点。本项目以广义两极虫及其宿主为模式材料，结合形态、生态、生物学特征与rRNA、HSP70、D-loop 和COI 基因分子标记，研究我国广义两极虫的多样性、系统地理学及两极虫与宿主之间的协同进化。本项目结束后，可获得以下方面的成果：1) 可给出两极虫关键类群鉴别的形态与分子数据的综合标准；2) 揭示两极虫多样性的形成、形态变异与宿主环境及物种形成的关键变量；3) 阐述两极虫迁移、扩散和传播的分子机制。两极虫的物种形成和分化与宿主物种形成和分化之间的分子系统关系、宿主群体遗传与两极虫群体遗传之间的关系；4) 弄清广义两极虫与宿主协同进化的规律，为国际间现今有关该类动物扩散规律和进化机制、生活史研究及黏孢子虫病的防治等研究提供新的基础资料，同时可为我国该类寄生原生动物区系研究、动物地理学研究提供重要基础资料.

Myxozoans is one kind of harmful parasite of marine and freshwater fishes, and its real phylogenetic position has been the research focus in the world. In the present project, the studies on the biodiversity, systematic geography and co-evolution between the myxozoans and hosts by using the gene markers, such as rRNA, HSP70, D-loop and COI gene, will be carried out based on the research materials of the generalized myxidiids species and their hosts. When the project is finished, the research fruits will include: 1) giving one synthetic criterion for the key group of myxidiids species on the basis of the morphological and molecular data. 2) revealing the key variation of biodiversity formation, morphology mutation, host environment and species formation. 3) expounding the molecular principle of migration, diffusion and dissemination, the phylogenetic relationship of species formation, divergence and population hereditary between myxidiids species and their hosts. 4) clarifying the co-evolution pattern in order to supply the base materials for this group’s dissemination, evolution, life cycle and disease prevention; meanwhile, providing the research materials on the fauna and zoogeography for these parasitic protozoans.