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The second rhizocephalan species, Lernaeodiscus kasyanovi sp. nov. (Cirripedia: Rhizocephala: Peltogastridae), parasitizing the porcellanid crab Pachycheles stevensii Stimpson, 1858 (Decapoda: Anomura: Porcellanidae), from Russian waters of the Sea of Japan

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Abstract

Molecular and morphological methods are used to describe the rhizocephalan Lernaeodiscus kasyanovi sp. nov. from Russian waters of the Sea of Japan, the second of two Lernaeodiscus species parasitizing the porcellanid crab Pachycheles stevensii Stimpson, 1858. Lernaeodiscus kasyanovi sp. nov. differs from the other species found on this host, Lernaeodiscus rybakovi Korn et al., 2020a, by molecular markers, by a smaller size, a lighter color, by the shape of receptacles, by the presence of marginal lobes in mature specimens, and by the retinacula type on the internal cuticle. Lernaeodiscus kasyanovi sp. nov. is the sister taxon to Lernaeodiscus porcellanae in the monophyletic genus Lernaeodiscus. Lernaeodiscus kasyanovi is rather rare compared to L. rybakovi, their prevalence on the porcellanid crab P. stevensii does not exceed 2%. It is the second example of two rhizocephalan species infesting the same brachyuran species in Peter the Great Bay.

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Acknowledgements

We are grateful to Denis V. Fomin for the technical assistance with facilities of the Far Eastern Center of Electron Microscopy (National Scientific Center of Marine Biology, FEB RAS, Vladivostok, Russia). We are also greatly indebted to anonymous reviewers whose comments allowed to improve our manuscript.

Funding

The report study was funded by RFBR, project number 20–04-00097 to OMK, and a grant by the Danish Academy for independent research (FNU) to JTH.

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Correspondence to Olga M. Korn.

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The authors declare no competing interests.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.

Sampling and field studies

All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on request.

Author contribution

OMK and DDG studied morphological characters. DAR and HG performed the molecular analysis. OMK and JTH wrote the manuscript. DDG performed all illustrations. All authors read and approved the manuscript.

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Communicated by E. Macpherson

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Korn, O.M., Golubinskaya, D.D., Rees, D.J. et al. The second rhizocephalan species, Lernaeodiscus kasyanovi sp. nov. (Cirripedia: Rhizocephala: Peltogastridae), parasitizing the porcellanid crab Pachycheles stevensii Stimpson, 1858 (Decapoda: Anomura: Porcellanidae), from Russian waters of the Sea of Japan. Mar. Biodivers. 51, 79 (2021). https://doi.org/10.1007/s12526-021-01211-x

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