Taxonomic Research of the Myxosporidia Based on Genetic Distance

In the present study,we used 18SrDNA as a molecular marker to research the distribution of genetic distance of some common genera of the Myxosporea.The results indicated that:there is a significant correlation between genetic relationships and genetic distances,species with the close relationship have a short genetic distance,and the reverse is also true;though there are some overlap on the genetic distances among intra-species,inter-species and inter-genera,the general trend of the genetic distance is:intra-speciesinter-speciesinter-genera.There may be no absolute bound for genetic distances among species,however,in a certain range,the divergence of genetic distance based on 18SrDNA is valid for most of species identification.