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Description of a new lung fluke species, Paragonimus vietnamensis sp. nov. (Trematoda, Paragonimidae), found in northern Vietnam

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Abstract

Based on morphology of metacercariae and adult worms together with molecular data from our previous study, we describe herein a new lung fluke species named Paragonimus vietnamensis sp. nov. Metacercariae of this new species is round and extremely large in size (nearly 800 μm in diameter) having a fragile outer cyst of variable thickness and a thin fragile inner cyst. There are little or no space between metacercaria and the inner cyst wall. These and other morphological features of metacercariae of P. vietnamensis sp. nov. are not completely identical with but have some similarities with those of P. microrchis, P. proliferus, or P. menglaensis. On the other hand, adult worms obtained by experimental infection of these large metacercariae are oval in shape, having a ventral sucker slightly larger than the oral one, and having singly arranged relatively short cuticular spines. These morphological features of adult worms are partly similar to but not identical with those of P. microrchis, P. skrjabini, P. yunnanenis, P. xiangshanensis, or P. harinasutai. Taken these morphological data and our previous molecular phylogenetic analyses of ITS2 and CO1 sequences of metacercariae and adult worms together, P. vietnamensis sp. nov. is different from any other known Paragonimus spp.

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Acknowledgements

One of the authors, Pham Ngoc Doanh, received financial support from the Japanese Society for Promotion of Science (JSPS) Ronpaku Fellowship no. NCST-10430 for Ph.D. degree. This work is also supported in part by Korea Foundation for Advanced Studies (KFAS) to Prof. Nguyen Thi Le. The authors are grateful to Dr. David Blair, James Cook University, Australia, Dr. Wang Xiao-Tong and Dr. Wei Li, Wenzhou Medical College second affiliated Hospital, China, and Dr. Masahiro Kusano, Novartis-Pharma, Tokyo, Japan, for their kind cooperation to gather copies of references appearing in Chinese journals.

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Authors and Affiliations

  1. Department of Parasitology, Institute of Ecology and Biological Resources, Vietnamese Academy of Science and Technology, Hanoi, Vietnam

    Pham Ngoc Doanh & Nguyen Thi Le

  2. Department of Bio-resources, Frontier Science Research Center, University of Miyazaki, Miyazaki, Japan

    Akio Shinohara

  3. Veterinary Teaching Hospital and Parasitology, Faculty of Agriculture, University of Miyazaki, Gakuen-kibanadai-Nishi, Miyazaki, 889-2192, Japan

    Yoichiro Horii

  4. Department of Parasitology, Fukuoka University School of Medicine, Fukuoka, Japan

    Shigehisa Habe

  5. Division of Parasitology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan

    Yukifumi Nawa

Authors
  1. Pham Ngoc Doanh
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  2. Akio Shinohara
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  3. Yoichiro Horii
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  4. Shigehisa Habe
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  5. Yukifumi Nawa
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  6. Nguyen Thi Le
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Correspondence to Yoichiro Horii.

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Doanh, P.N., Shinohara, A., Horii, Y. et al. Description of a new lung fluke species, Paragonimus vietnamensis sp. nov. (Trematoda, Paragonimidae), found in northern Vietnam. Parasitol Res 101, 1495–1501 (2007). https://doi.org/10.1007/s00436-007-0666-9

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  • DOI: https://doi.org/10.1007/s00436-007-0666-9

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