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Two new axinid species (Monogenea: Axinidae) from the Pharao flyingfish Cypselurus naresii (Günther) (Beloniformes: Exocoetidae) in the Gulf of Tonkin off Vietnam

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Abstract

A total of 21 Pharao flyingfish Cypselurus naresii (Günther) from the Gulf of Tonkin off Vietnam was examined for monogeneans. Ten individuals were parasitised by 72 specimens of two new axinid species of two rare and little known genera, Unnithanaxine Price, 1962 containing only one species, U. parawa (Unnithan, 1957), and Loxuroides Price, 1962 containing two species, L. sasikala (Unnithan, 1957) and L. fungilliformis Zhang, Ding, Liu & Wang, 1999. Unnithanaxine naresii n. sp. and Loxuroides pricei n. sp. are described and differentiated from the related species. Unnithanaxine naresii n. sp. is morphologically similar to U. parawa but is distinguished by the size of the clamps and reproduction organs, the number of spines in the lateral groups of the genital atrium, and in parasitism in a host fish species of a different genus. Loxuroides pricei n. sp. differs from L. fungilliformis in the greater size of the body, the number of clamps, testes, spines on cirrus and genital atrium, and in parasitism in a different host family. Similarly, L. pricei can be separated from L. sasikala in having a shorter distance from the anterior extremity to genital atrium or vaginal region, fewer testes, and a slightly greater number of spines on cirrus and genital atrium.

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Acknowledgements

We would like to thank Dr David I. Gibson, The Natural History Museum, London, UK, for providing literature. We also appreciate the valuable contributions of the anonymous reviewers.

Funding

This study was funded by the Vietnam National Foundation for Science and Technology (NAFOSTED, grant number 106.15–2012.08). The samples were provided by two projects, i.e. (i) “Investigation and evaluation of the harmful effects of parasites in some economic aquatic species in the coastal area of northern Vietnam 2013–2017” (VAST.DTCB.01/13–14) supported by the Ministry of Planning and Investment and (ii) “Investigation and evaluation of the parasites and microorganisms in the sea areas of Vietnam with the aims to protect marine ecosystems and public health”, supported by National Programs (VAST.DA47.DA.12/15–18).

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Authors and Affiliations

  1. Insititute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi, Vietnam

    Hung Manh Nguyen, Ha Van Nguyen & Ngo Duy Ha

  2. Research Institute for Aquaculture No. 1, Dinh Bang, Tu Son, Bac Ninh Province, Vietnam

    Thanh Ngoc Bui

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  1. Hung Manh Nguyen
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  2. Ha Van Nguyen
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  3. Thanh Ngoc Bui
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  4. Ngo Duy Ha
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Correspondence to Hung Manh Nguyen.

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Nguyen, H.M., Nguyen, H.V., Bui, T.N. et al. Two new axinid species (Monogenea: Axinidae) from the Pharao flyingfish Cypselurus naresii (Günther) (Beloniformes: Exocoetidae) in the Gulf of Tonkin off Vietnam. Syst Parasitol 93, 387–394 (2016). https://doi.org/10.1007/s11230-016-9635-y

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  • DOI: https://doi.org/10.1007/s11230-016-9635-y

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