Abstract: Two new species of myxosporeans (Myxosporea:Bivalvulida),Mitrapora yiduensis sp.nov.and Myxobolus tuenfengensis sp.nov.,parasitic in freshwater fishes collected from the Yangtze River of China are described in this paper.All body organs of the host fishes,Siniperca chuatsi Basilewsky and Saurogobio dabrui Bleeker were examined and twenty spores of each myxosporean were measured with an eyepiece micrometer.All the measurement are in micrometers (μm) and the type specimens were deposited to Department of Fish Disease,the Institute of Hydrobiology, Chinese Academy of sciences,Wuhan,China.