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<p>We investigated two species of bithyniid snails, <i>Gabbia kiusiuensis</i> and <i>Parafossarulus manchouricus japonicus</i>, in Shiga Prefecture, Japan, between 2021 and 2024, to evaluate their infections with cercariae of trematodes. A type of parapleurolophocercous cercariae was detected in <i>G. kiusiuensis</i> from a locality near Lake Biwa. 28S rDNA and <i>cox1</i> sequence analyses revealed that these cercariae probably belong to the genus <i>Opisthorchis</i> Blanchard, 1895. This is the first record of this genus in snails in Japan. Species of <i>Opisthorchis</i> can be pathogenic to mammals and birds, but the actual pathogenicity of the present species remains unknown. The recent spread of <i>G. kiusiuensis</i> in Japan could lead to cases of liver fluke infections.</p>

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New record of the cercariae of liver fluke (Opisthorchis sp.) (Digenea: Opisthorchiidae) from Gabbia kiusiuensis (S. Hirase, 1927) (Caenogastropoda: Bithyniidae) in Shiga prefecture, Japan

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Shin Kubo,
  • Shigefumi Kanao,
  • Karin Tsuchida,
  • Misako Urabe

摘要

We investigated two species of bithyniid snails, Gabbia kiusiuensis and Parafossarulus manchouricus japonicus, in Shiga Prefecture, Japan, between 2021 and 2024, to evaluate their infections with cercariae of trematodes. A type of parapleurolophocercous cercariae was detected in G. kiusiuensis from a locality near Lake Biwa. 28S rDNA and cox1 sequence analyses revealed that these cercariae probably belong to the genus Opisthorchis Blanchard, 1895. This is the first record of this genus in snails in Japan. Species of Opisthorchis can be pathogenic to mammals and birds, but the actual pathogenicity of the present species remains unknown. The recent spread of G. kiusiuensis in Japan could lead to cases of liver fluke infections.