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<p>We describe the branchial-parasitic bopyrid isopod <i>Munidion nihonicum</i> <b>sp. nov.</b> from the munidid squat lobster <i>Paramunida belone</i> Macpherson, 1993, collected from 163–182&#xa0;m depth off Amami-Ohshima Island, East China Sea, northwestern Pacific. The parasite resembles <i>Munidion laterale</i> Richardson, 1910 and two species in the closely related genus <i>Pleurocrypta</i> (<i>P. microbranchiata</i> G. O. Sars, 1899 and <i>P. piriformis</i> Bourdon, 1968) but differs from them in the shape of the body, the shape of the maxillipedal palp, the state of lobes on the barbula, and the shape of oostegite 1. The host species of <i>Munidion nihonicum</i> <b>sp. nov.</b> is also different from those of the three similar species: <i>Paramunida belone</i> (Munididae) for <i>M. nihonicum</i> <b>sp. nov.</b>; <i>Paramunida scabra</i> (Henderson, 1885) (Munididae) for <i>M. laterale</i>; <i>Galathea intermedia</i> Liljeborg, 1851 (Galatheidae) for <i>P. microbranchiata</i>; and <i>Galathea strigosa</i> (Linnaeus, 1761) (Galatheidae) for <i>P. piriformis</i>. We determined partial sequences for the 18S rRNA (18S) and 28S rRNA (28S) genes for <i>M. nihonicum</i> <b>sp. nov.</b> and 10 other isopod species, and in some cases also for the cytochrome <i>c</i> oxidase subunit I (COI) gene, and present maximum-likelihood phylogenetic trees for Epicaridea based on 18S and 18S + 28S. In our trees, Pseudioninae was not monophyletic and <i>Pleurocryptella</i> Bonnier, 1900 lies outside a clade containing the other bopyrid taxa, i.e., Bopyridae is not monophyletic.</p>

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A new bopyrid species (Crustacea: Isopoda: Epicaridea: Bopyroidea) parasitic on a squat lobster from Japan, with molecular phylogenies for Epicaridea

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Yurina Katsuragawa,
  • Shoki Shiraki,
  • Michitaka Shimomura,
  • Keiichi Kakui

摘要

We describe the branchial-parasitic bopyrid isopod Munidion nihonicum sp. nov. from the munidid squat lobster Paramunida belone Macpherson, 1993, collected from 163–182 m depth off Amami-Ohshima Island, East China Sea, northwestern Pacific. The parasite resembles Munidion laterale Richardson, 1910 and two species in the closely related genus Pleurocrypta (P. microbranchiata G. O. Sars, 1899 and P. piriformis Bourdon, 1968) but differs from them in the shape of the body, the shape of the maxillipedal palp, the state of lobes on the barbula, and the shape of oostegite 1. The host species of Munidion nihonicum sp. nov. is also different from those of the three similar species: Paramunida belone (Munididae) for M. nihonicum sp. nov.; Paramunida scabra (Henderson, 1885) (Munididae) for M. laterale; Galathea intermedia Liljeborg, 1851 (Galatheidae) for P. microbranchiata; and Galathea strigosa (Linnaeus, 1761) (Galatheidae) for P. piriformis. We determined partial sequences for the 18S rRNA (18S) and 28S rRNA (28S) genes for M. nihonicum sp. nov. and 10 other isopod species, and in some cases also for the cytochrome c oxidase subunit I (COI) gene, and present maximum-likelihood phylogenetic trees for Epicaridea based on 18S and 18S + 28S. In our trees, Pseudioninae was not monophyletic and Pleurocryptella Bonnier, 1900 lies outside a clade containing the other bopyrid taxa, i.e., Bopyridae is not monophyletic.