To identify Ligula intestinalis pleroceroid parasitizing in the abdominal cavity of Gymnocypris przewalskii and analyze its phylogenic status from Qinghai Lake, China, polymerase chain reaction(PCR) of 18 S ribosomal RNA gene, COⅠand COB gene was carried out. Their sequences homologies with other tapeworm species were analyzed and the phylogenetic relationships were inferred. The results showed that the noodle-like parasite was identified as L.intestinalis, and that its 18 S rRNA gene homogeneity was 100.00...