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Choniomyzon inflatus n. sp. (Crustacea: Copepoda: Nicothoidae) associated with Ibacus novemdentatus (Crustacea: Decapoda: Scyllaridae) from Japanese waters

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Abstract

A new species of parasitic copepod, Choniomyzon inflatus n. sp., is described based on specimens collected from the external egg masses of the smooth fan lobster Ibacus novemdentatus Gibbes captured in the North Pacific Ocean off Ainan, Ehime Prefecture, western Japan. The new species differs from its congeners in having a globular to ovoid prosome, in bearing asymmetrically arranged denticles at a rounded apex of both the terminal segment of the antenna and the maxilliped, and in lacking serrate lobes on the basis of legs 1 and 2. The species is similar in size and shape to the host’s eggs, which may be interpreted as egg mimicry. The new species is the first member of Choniomyzon Pillai, 1962 from subtropical regions.

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Acknowledgments

The authors express their gratitude to Mr Nobutake Hamaguchi and Mr Akihito Suzuki for their help with collecting specimens. They are also grateful to Mr Hirotaka Katahira for his assistance with the dissection and drawings. Two anonymous referees are thanked for their valuable suggestions.

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Authors and Affiliations

  1. Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato, Tokyo, 108-8477, Japan

    Kaori Wakabayashi, Shusaku Otake & Yuji Tanaka

  2. Laboratory of Aquaculture, Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8528, Japan

    Kazuya Nagasawa

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  1. Kaori Wakabayashi
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  2. Shusaku Otake
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  3. Yuji Tanaka
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  4. Kazuya Nagasawa
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Correspondence to Kaori Wakabayashi.

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Wakabayashi, K., Otake, S., Tanaka, Y. et al. Choniomyzon inflatus n. sp. (Crustacea: Copepoda: Nicothoidae) associated with Ibacus novemdentatus (Crustacea: Decapoda: Scyllaridae) from Japanese waters. Syst Parasitol 84, 157–165 (2013). https://doi.org/10.1007/s11230-012-9397-0

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