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Phylogenetic Assessment of Two Antarctic Representatives of Paralepidapedon Shimazu & Shimura, 1984 (Trematoda: Lepidapedidae)

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Abstract

The genus Paralepidapedon Shimazu & Shimura, 1984 unites lepidapedid trematodes with a uroproct, intercaecal and postbifurcal positions of the common genital pore, and an intestinal bifurcation located at a significant distance from the ventral sucker. Species of this genus are divided into two groups according to presence/absence of the membranous sac around the external seminal vesicle and adjacent prostatic cells in adults. We found two trematode species morphologically corresponding to the group of Paralepidapedon spp. with the membranous sac in the gadiform fish Macrourus whitsoni (Regan, 1913) from the Ross Sea (Antarctic). These trematodes were initially assigned to Paralepidapedon sp. 1 and Paralepidapedon sp. 2. Phylogenetic analyses based on 28S rRNA gene partial sequences resolved phylogenetic relationships of these trematodes within the Lepidapedon clade. Paralepidapedon sp. 1 was also grouped with Lepidapedon spp. based on the nd1 gene analysis. These data are unexpected, since blind-ending caeca are typical of Lepidapedon spp. Phylogenetic analyses also confirmed the paraphyly of the genus Neolepidapedon Manter, 1954. Based on our data, we hypothesise that only species without the membranous sac are the members of the genus Paralepidapedon, while species with this structure should be moved to the genus Lepidapedon.

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ACKNOWLEDGMENTS

The authors are grateful to the crew of the FV Yantar-35 (ORION Ltd., Khabarovsk) and to Alexey Finogenov (Southern Research Institute of Marine Fisheries and Oceanography, Odessa, Ukraine) for help with the collection of the specimens and to Sofia Denisova (St. Petersburg State University) for her help in preparing the manuscript.

Funding

The paper is a part of the state-supported studies in the A.N. Severtsov Institute of Ecology and Evolution, of Russian Academy of Sciences (project no. FFER-2021-0005).

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Authors and Affiliations

  1. Severtsov Institute of Ecology and Evolution, 119071, Moscow, Russia

    S. G. Sokolov

  2. Department of Invertebrate Zoology, St. Petersburg State University, 199034, St. Petersburg, Russia

    S. V. Shchenkov

  3. Russian Federal Research Institute of Fisheries and Oceanography, 107140, Moscow, Russia

    I. I. Gordeev

  4. Department of Invertebrate Zoology, Moscow State University, 119234, Moscow, Russia

    I. I. Gordeev

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  1. S. G. Sokolov
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Correspondence to I. I. Gordeev.

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Statement on the welfare of animals. The authors followed all applicable international, national, and/or institutional guidelines for the care and use of animals. The authors obtained all necessary permits for sampling and observational field studies from the competent authorities.

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Sokolov, S.G., Shchenkov, S.V. & Gordeev, I.I. Phylogenetic Assessment of Two Antarctic Representatives of Paralepidapedon Shimazu & Shimura, 1984 (Trematoda: Lepidapedidae). Russ J Mar Biol 48, 202–212 (2022). https://doi.org/10.1134/S1063074022030087

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