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Morphological, histological and molecular characterization of three Myxobolus species (Cnidaria: Myxosporea) from silver carp Hypophthalmichthys molitrix Valenciennes and bighead carp Hypophthalmichthys nobilis Richardson in China.

Three Myxobolus species were obtained from silver carp Hypophthalmichthys molitrix Valenciennes and bighead carp Hypophthalmichthys nobilis Richardson in China. In the present study, we supplemented their taxonomic characteristics by the morphological, histological and molecular methods. Myxobolus kiuchowensis Chen in Chen et Ma, 1998 formed small ellipsoidal plasmodia in the intestinal wall of bighead carp. Its spores appeared asymmetrical obovate in frontal view and fusiform in lateral view. Tiny mamillary protrusion in the anterior of some spores was observed. Two pyriform polar capsules were unequal. Histologically, M. kiuchowensis infected the tunica muscularis of host intestine. Myxobolus abitus Li et Nie, 1973 formed sausage-like plasmodia in the gills of silver carp. Its spores appeared oblate in frontal view and fusiform in lateral view. Two pyriform polar capsules were unequal and an obvious inter-capsule appendix was observed. Histological examination revealed that M. abitus developed in the interlamellar-epithelium of host gills. Myxobolus pavlovskii (Akhmerov, 1954) Landsberg et Lom, 1991 formed sausage-like plasmodia both in the gills of silver carp and bighead carp. Spores of M. pavlovskii were proximate oval in frontal view and fusiform in lateral view. Two pyriform polar capsules were unequal. The BLAST search indicated the SSU rDNA sequences of M. kiuchowensis and M. abitus were not identical to any sequence, however, the SSU rDNA sequences of M. pavlovskii were identical to that of M. pavlovskii recorded previously. Phylogenetic analysis showed that the present three species robustly clustered together in Cyprinid group and Asia group.

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