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Descriptions of two new species of Rhizorhina Hansen, 1892 (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on tanaidacean crustaceans, with a note on their phylogenetic position

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Abstract

Two new species of nicothoid copepod are described. Rhizorhina ohtsukai n. sp. found on a leptocheliid (Leptochelia sp.) collected at depths of 151–136 m in the North Pacific Ocean is most similar to Rhizorhina aesthetes Boxshall & Harrison, 1988 but can be distinguished by the possession of a narrower body with a rounded anterior end, and in the position of the gonopores. Rhizorhina soyoae n. sp. found on an apseudid (Fageapseudes sp.) collected at depths of 1,595–1,557 m in East China Sea most closely resembles Rhizorhina tanaidaceae Gotto, 1984 but differs in having a narrower body with a rounded anterior end. Partial nucleotide sequences of the cytochrome c oxidase subunit I (COI) gene were obtained from the two copepods in order to enable future barcoding. A phylogenetic reconstruction based on the 18S rRNA gene placed the copepods within the Siphonostomatoida Burmeister, 1835, with the nicothoid Choniosphaera maenadis (Bloch & Gallien, 1933), and separate from the Rhizorhina spp. clade, suggesting that the family Nicothoidae Dana, 1849 is not monophyletic. This is the third report of copepods parasitic on tanaidacean crustaceans.

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Acknowledgements

I thank Taeko Kimura, Shoichi Kimura, Ken Fujimoto and Hideki Kaeriyama for providing specimens used in this study; Captains Makoto Uchida of TR/V Seisui-maru and Shiro Sawadaishi of R/V Soyo-maru and the crews of the two vessels for their kind support during the cruises; Hiroshi Kajihara for providing laboratory facilities; Susumu Ohtsuka for valuable comments on an early draft; two anonymous reviewers for improving the manuscript; and Matthew H. Dick for reviewing and editing the manuscript.

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  1. Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan

    Keiichi Kakui

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Correspondence to Keiichi Kakui.

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Kakui, K. Descriptions of two new species of Rhizorhina Hansen, 1892 (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on tanaidacean crustaceans, with a note on their phylogenetic position. Syst Parasitol 93, 57–68 (2016). https://doi.org/10.1007/s11230-015-9604-x

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  • DOI: https://doi.org/10.1007/s11230-015-9604-x

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