Abstract
During a survey of myxozoan parasites of common carp Cyprinus carpio in Honghu Lake, Hubei Province, China, a parasite was collected that was identified as Myxobolus dispar based on an earlier description from China. However, the small subunit ribosomal DNA of this species shared only 90 % similarity with M. dispar, instead matching M. musseliusae with 100 % identity. To resolve this apparent taxonomic conflict, the validity of M. dispar reported from China was investigated. The species encountered here and in the earlier report from China both bear spores that are notably smaller than those of M. dispar in Europe. In the present study, a mucous envelope was adhered to the posterior of many fresh spores and was observed to expand and surround the spore. This structure has never been reported from fresh spores of M. dispar. Histology showed extravascular plasmodia in the gill filaments in close contact with the cartilaginous ray of the filament, which contrasts with the plasmodia of M. dispar which develop in the arteries of the gill filaments. Phylogenetically, the current species is distinct from M. dispar, instead forming a sister group with M. musseliusae. The data presented here allow us to conclude that the species isolated is M. musseliusae and that prior reports of M. dispar in China are unsubstantiated.
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Acknowledgments
The authors thank Gao Yu (College of Fisheries, Huazhong Agricultural University) for his help with the drawing of spores and **ao Peng (Institute of Hydrobiology, Chinese Academy of Sciences) for providing the applied microscope. The authors are also thankful to Edit Eszterbauer (Veterinary Medical Research Institute, Hungarian Academy of Sciences) for providing helpful suggestions on this article. This study was supported by the Nature Science Foundation of China (project numbers 31172052 and 30800096), the Science Fund for Distinguished Young Scholars of Hubei Province (project number 2011CDA091), the New Teacher Foundation of Chinese Education Department (project number 200805041025), the Huazhong Agricultural University Scientific & Technological Self-innovation Foundation (project number 2009SC017), the Fundamental research funds for the central universities (project numbers 2011PY011 and 2012PY004), and the Technology Project for strengthening innovation of Yunnan Province (project number 2009AD009). The Hungarian partner was financed by the grant OTKA, project no. K71837.
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Liu, Y., Whipps, C.M., Gu, Z.M. et al. Myxobolus musseliusae (Myxozoa: Myxobolidae) from the gills of common carp Cyprinus carpio and revision of Myxobolus dispar recorded in China. Parasitol Res 112, 289–296 (2013). https://doi.org/10.1007/s00436-012-3136-y
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DOI: https://doi.org/10.1007/s00436-012-3136-y