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Some additional data to the occurrence, morphology and validity of Myxobolus turpisrotundus Zhang, 2009 (Myxozoa: Myxosporea)

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Abstract

Myxobolus turpisrotundus Zhang, 2009, infects allogynogenetic gibel carp Carassius auratus gibelio (Bloch) and is always regarded as synonymous with Myxobolus rotundus Nemeczek, 1911, since its first report in goldfish Carassius auratus auratus (L.) in China in 1955. In this study, it was comprehensively examined by morphological and molecular biological methods. The round spores of M. turpisrotundus are similar to those of M. rotundus from common bream Abramis brama (L.) in morphology; however, we detected slight differences in morphometry. The ratios of the length and width of the spore to the length and width of the polar capsule of M. turpisrotundus are usually below 2.0 and 1.9, respectively, however these ratios are always above 2.0 and 1.9 in M. rotundus. The plasmodium size of M. turpisrotundus is 600-6,200 μm in diameter and that of M. rotundus is 60-180 μm in diameter. Scanning observation showed the spore surface of M. turpisrotundus was generally pitted. Yet the surface of M. rotundus is smooth. Sequence comparison revealed the small subunit ribosomal RNA gene sequence of M. turpisrotundus did not match any published sequences of M. rotundus (EU710583, 85% over 742 bp; FJ851447, 85% over 742 bp, FJ851448, 85% over 742 bp; FJ851449, 85% over 742 bp). Moreover, phylogenetic analysis showed M. turpisrotundus clustered with the species from allogynogenetic gibel carp with high bootstrap values (100% neighbor-joining, NJ; 100% maximum parsimony, MP) and M. rotundus from common bream composed a new cluster with high bootstrap values (100% NJ, 100% MP). From the morphological and molecular biological data, we gain enough evidences to support the validity of M. turpisrotundus.

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Acknowledgments

The authors thank Prof. Molnár, Prof. Bahri, and Dr. Li for their valuable suggestions and critical reading of this manuscript. This study was supported by grant from Natural Science Foundation of Hubei Province (2008CDB078).

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  1. College of Fisheries, Huazhong Agricultural University, Wuhan, Hubei Province, 430070, People’s Republic of China

    Y. Liu, Z. M. Gu & Y. L. Luo

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  1. Y. Liu
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  2. Z. M. Gu
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  3. Y. L. Luo
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Correspondence to Z. M. Gu.

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Liu, Y., Gu, Z.M. & Luo, Y.L. Some additional data to the occurrence, morphology and validity of Myxobolus turpisrotundus Zhang, 2009 (Myxozoa: Myxosporea). Parasitol Res 107, 67–73 (2010). https://doi.org/10.1007/s00436-010-1835-9

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